Why am I observing broad split peaks in Aqueous Normal Phase ANP when using acetonitrile and methanol diluents – FAQ

collapsCat options: Array ( [title] => Article Categories [showPostCount] => 1 [inExclude] => exclude [inExcludeCats] => default-title,uncategorized,featured-articles,180,1651,ce-accessories [showPosts] => 0 [showPages] => 0 [linkToCat] => 0 [olderThan] => 0 [excludeAll] => 0 [catSortOrder] => ASC [catSort] => catName [postSortOrder] => ASC [postSort] => postTitle [expand] => 2 [defaultExpand] => [debug] => 1 [postTitleLength] => 0 [catfeed] => none [taxonomy] => category [post_type] => post [postDateAppend] => after [postDateFormat] => m/d [showPostDate] => 1 [useCookies] => 1 [postsBeforeCats] => 1 [expandCatPost] => 1 [showEmptyCat] => 1 [showTopLevel] => 1 [useAjax] => 0 [customExpand] => [customCollapse] => [style] => kubrick [accordion] => 1 [title_link] => [addMisc] => 1 [addMiscTitle] => [number] => 3 [includeCatArray] => Array ( ) [expandSym] => [+] [collapseSym] => [—] ) postsToExclude: Array ( ) CATEGORY QUERY RESULTS Array ( [0] => WP_Term Object ( [term_id] => 165 [name] => 2.o™ HPLC Columns FAQ [slug] => 127 [term_group] => 0 [term_taxonomy_id] => 165 [taxonomy] => category [description] => [parent] => 153 [count] => 99 [filter] => raw ) [1] => WP_Term Object ( [term_id] => 211 [name] => Accounting - AP/AR Department [slug] => 116 [term_group] => 0 [term_taxonomy_id] => 211 [taxonomy] => category [description] => [parent] => 210 [count] => 22 [filter] => raw ) [2] => WP_Term Object ( [term_id] => 221 [name] => Accounting Dept. Forms [slug] => 124 [term_group] => 0 [term_taxonomy_id] => 221 [taxonomy] => category [description] => [parent] => 211 [count] => 7 [filter] => raw ) [3] => WP_Term Object ( [term_id] => 229 [name] => Accounts Receivable [slug] => 147 [term_group] => 0 [term_taxonomy_id] => 229 [taxonomy] => category [description] => [parent] => 225 [count] => 2 [filter] => raw ) [4] => WP_Term Object ( [term_id] => 263 [name] => All PEEK HPLC Columns Information [slug] => metal-free-column-surfaces [term_group] => 0 [term_taxonomy_id] => 263 [taxonomy] => category [description] => All-PEEK, PEEK with Titanium frits, Dursan coated columns and frits. [parent] => 76 [count] => 32 [filter] => raw ) [5] => WP_Term Object ( [term_id] => 154 [name] => Amide FAQ [slug] => 168 [term_group] => 0 [term_taxonomy_id] => 154 [taxonomy] => category [description] => [parent] => 153 [count] => 8 [filter] => raw ) [6] => WP_Term Object ( [term_id] => 266 [name] => ANP Aqueous Normal Phase Articles [slug] => anp-aqueous-normal-phase-articles [term_group] => 0 [term_taxonomy_id] => 266 [taxonomy] => category [description] => [parent] => 71 [count] => 85 [filter] => raw ) [7] => WP_Term Object ( [term_id] => 214 [name] => App Notes Internal, USP & Archived [slug] => 142 [term_group] => 0 [term_taxonomy_id] => 214 [taxonomy] => category [description] => [parent] => 5 [count] => 35 [filter] => raw ) [8] => WP_Term Object ( [term_id] => 106 [name] => AppNotes AgroChem [slug] => 83 [term_group] => 0 [term_taxonomy_id] => 106 [taxonomy] => category [description] => [parent] => 105 [count] => 11 [filter] => raw ) [9] => WP_Term Object ( [term_id] => 265 [name] => AppNotes Alternate Generic Methods [slug] => appnotes-usp-methods [term_group] => 0 [term_taxonomy_id] => 265 [taxonomy] => category [description] => [parent] => 14 [count] => 26 [filter] => raw ) [10] => WP_Term Object ( [term_id] => 113 [name] => AppNotes ANP/HILIC Methods [slug] => 138 [term_group] => 0 [term_taxonomy_id] => 113 [taxonomy] => category [description] => [parent] => 14 [count] => 198 [filter] => raw ) [11] => WP_Term Object ( [term_id] => 107 [name] => AppNotes Chemicals/Energy [slug] => 86 [term_group] => 0 [term_taxonomy_id] => 107 [taxonomy] => category [description] => [parent] => 105 [count] => 24 [filter] => raw ) [12] => WP_Term Object ( [term_id] => 94 [name] => AppNotes Cogent Amide [slug] => 167 [term_group] => 0 [term_taxonomy_id] => 94 [taxonomy] => category [description] => [parent] => 84 [count] => 11 [filter] => raw ) [13] => WP_Term Object ( [term_id] => 97 [name] => AppNotes Cogent Bidentate C18 [slug] => 92 [term_group] => 0 [term_taxonomy_id] => 97 [taxonomy] => category [description] => [parent] => 84 [count] => 96 [filter] => raw ) [14] => WP_Term Object ( [term_id] => 57 [name] => AppNotes Cogent Bidentate C8 [slug] => 97 [term_group] => 0 [term_taxonomy_id] => 57 [taxonomy] => category [description] => [parent] => 84 [count] => 19 [filter] => raw ) [15] => WP_Term Object ( [term_id] => 96 [name] => AppNotes Cogent Bidentate C8 300 [slug] => 100 [term_group] => 0 [term_taxonomy_id] => 96 [taxonomy] => category [description] => [parent] => 84 [count] => 5 [filter] => raw ) [16] => WP_Term Object ( [term_id] => 264 [name] => AppNotes Cogent Biphenyl [slug] => biphenyl-appnotes [term_group] => 0 [term_taxonomy_id] => 264 [taxonomy] => category [description] => [parent] => 15 [count] => 1 [filter] => raw ) [17] => WP_Term Object ( [term_id] => 98 [name] => AppNotes Cogent Diamond Hydride [slug] => 90 [term_group] => 0 [term_taxonomy_id] => 98 [taxonomy] => category [description] => [parent] => 84 [count] => 181 [filter] => raw ) [18] => WP_Term Object ( [term_id] => 99 [name] => AppNotes Cogent Diol [slug] => 146 [term_group] => 0 [term_taxonomy_id] => 99 [taxonomy] => category [description] => [parent] => 84 [count] => 7 [filter] => raw ) [19] => WP_Term Object ( [term_id] => 160 [name] => AppNotes Cogent HPS [slug] => 135 [term_group] => 0 [term_taxonomy_id] => 160 [taxonomy] => category [description] => [parent] => 15 [count] => 4 [filter] => raw ) [20] => WP_Term Object ( [term_id] => 261 [name] => AppNotes Cogent Phenyl Hexyl [slug] => appnotes-cogent-phenyl-hexyl [term_group] => 0 [term_taxonomy_id] => 261 [taxonomy] => category [description] => [parent] => 15 [count] => 3 [filter] => raw ) [21] => WP_Term Object ( [term_id] => 100 [name] => AppNotes Cogent Phenyl Hydride [slug] => 93 [term_group] => 0 [term_taxonomy_id] => 100 [taxonomy] => category [description] => [parent] => 84 [count] => 40 [filter] => raw ) [22] => WP_Term Object ( [term_id] => 262 [name] => AppNotes Cogent RP C8 [slug] => appnotes-cogent-rp-c8 [term_group] => 0 [term_taxonomy_id] => 262 [taxonomy] => category [description] => [parent] => 15 [count] => 8 [filter] => raw ) [23] => WP_Term Object ( [term_id] => 101 [name] => AppNotes Cogent Silica-C [slug] => 98 [term_group] => 0 [term_taxonomy_id] => 101 [taxonomy] => category [description] => [parent] => 84 [count] => 7 [filter] => raw ) [24] => WP_Term Object ( [term_id] => 102 [name] => AppNotes Cogent UDA [slug] => 99 [term_group] => 0 [term_taxonomy_id] => 102 [taxonomy] => category [description] => [parent] => 84 [count] => 7 [filter] => raw ) [25] => WP_Term Object ( [term_id] => 103 [name] => AppNotes Cogent UDC Cholesterol [slug] => 94 [term_group] => 0 [term_taxonomy_id] => 103 [taxonomy] => category [description] => [parent] => 84 [count] => 19 [filter] => raw ) [26] => WP_Term Object ( [term_id] => 108 [name] => AppNotes Food and Beverages [slug] => 84 [term_group] => 0 [term_taxonomy_id] => 108 [taxonomy] => category [description] => [parent] => 105 [count] => 81 [filter] => raw ) [27] => WP_Term Object ( [term_id] => 14 [name] => AppNotes Library [slug] => 63 [term_group] => 0 [term_taxonomy_id] => 14 [taxonomy] => category [description] => [parent] => 4 [count] => 430 [filter] => raw ) [28] => WP_Term Object ( [term_id] => 15 [name] => AppNotes Listed by Column [slug] => 91 [term_group] => 0 [term_taxonomy_id] => 15 [taxonomy] => category [description] => [parent] => 14 [count] => 49 [filter] => raw ) [29] => WP_Term Object ( [term_id] => 104 [name] => AppNotes Listed by Compound [slug] => 96 [term_group] => 0 [term_taxonomy_id] => 104 [taxonomy] => category [description] => [parent] => 14 [count] => 1 [filter] => raw ) [30] => WP_Term Object ( [term_id] => 105 [name] => AppNotes Listed by Discipline [slug] => 95 [term_group] => 0 [term_taxonomy_id] => 105 [taxonomy] => category [description] => [parent] => 14 [count] => 38 [filter] => raw ) [31] => WP_Term Object ( [term_id] => 110 [name] => AppNotes Metabolites [slug] => 85 [term_group] => 0 [term_taxonomy_id] => 110 [taxonomy] => category [description] => [parent] => 105 [count] => 76 [filter] => raw ) [32] => WP_Term Object ( [term_id] => 258 [name] => AppNotes Normal Phase [slug] => appnotes-normal-phase [term_group] => 0 [term_taxonomy_id] => 258 [taxonomy] => category [description] => [parent] => 14 [count] => 4 [filter] => raw ) [33] => WP_Term Object ( [term_id] => 109 [name] => AppNotes Pharmaceuticals [slug] => 82 [term_group] => 0 [term_taxonomy_id] => 109 [taxonomy] => category [description] => [parent] => 105 [count] => 228 [filter] => raw ) [34] => WP_Term Object ( [term_id] => 111 [name] => AppNotes Proteins Peptides [slug] => 87 [term_group] => 0 [term_taxonomy_id] => 111 [taxonomy] => category [description] => [parent] => 105 [count] => 9 [filter] => raw ) [35] => WP_Term Object ( [term_id] => 114 [name] => AppNotes Reversed Phase Methods [slug] => 140 [term_group] => 0 [term_taxonomy_id] => 114 [taxonomy] => category [description] => [parent] => 14 [count] => 184 [filter] => raw ) [36] => WP_Term Object ( [term_id] => 17 [name] => AppNotes RP C18 [slug] => 181 [term_group] => 0 [term_taxonomy_id] => 17 [taxonomy] => category [description] => [parent] => 15 [count] => 22 [filter] => raw ) [37] => WP_Term Object ( [term_id] => 18 [name] => AppNotes RSA Vials [slug] => rsa-glass-vial-applications [term_group] => 0 [term_taxonomy_id] => 18 [taxonomy] => category [description] => [parent] => 14 [count] => 6 [filter] => raw ) [38] => WP_Term Object ( [term_id] => 84 [name] => AppNotes TYPE-C Columns [slug] => cogent-type-c-silica-columns [term_group] => 0 [term_taxonomy_id] => 84 [taxonomy] => category [description] => [parent] => 15 [count] => 3 [filter] => raw ) [39] => WP_Term Object ( [term_id] => 315 [name] => Archived [slug] => archived [term_group] => 0 [term_taxonomy_id] => 315 [taxonomy] => category [description] => For KBa's that are no longer valid but placed here as a record of past policies or data. [parent] => 5 [count] => 1 [filter] => raw ) [40] => WP_Term Object ( [term_id] => 4 [name] => ARTICLES, APPNOTES, FAQ [slug] => 46 [term_group] => 0 [term_taxonomy_id] => 4 [taxonomy] => category [description] => [parent] => 0 [count] => 1111 [filter] => raw ) [41] => WP_Term Object ( [term_id] => 120 [name] => Autosampler Vials FAQ [slug] => 9 [term_group] => 0 [term_taxonomy_id] => 120 [taxonomy] => category [description] => [parent] => 119 [count] => 120 [filter] => raw ) [42] => WP_Term Object ( [term_id] => 250 [name] => Autosampler Vials Information [slug] => autosampler-vial-tips [term_group] => 0 [term_taxonomy_id] => 250 [taxonomy] => category [description] => [parent] => 4 [count] => 124 [filter] => raw ) [43] => WP_Term Object ( [term_id] => 257 [name] => Autosampler Vials Internal [slug] => autosampler-vials [term_group] => 0 [term_taxonomy_id] => 257 [taxonomy] => category [description] => [parent] => 5 [count] => 3 [filter] => raw ) [44] => WP_Term Object ( [term_id] => 272 [name] => Beta Tool Information [slug] => beta-tool-information [term_group] => 0 [term_taxonomy_id] => 272 [taxonomy] => category [description] => [parent] => 146 [count] => 2 [filter] => raw ) [45] => WP_Term Object ( [term_id] => 156 [name] => Bidentate C18 FAQ [slug] => 22 [term_group] => 0 [term_taxonomy_id] => 156 [taxonomy] => category [description] => [parent] => 153 [count] => 26 [filter] => raw ) [46] => WP_Term Object ( [term_id] => 155 [name] => Bidentate C8 FAQ [slug] => 23 [term_group] => 0 [term_taxonomy_id] => 155 [taxonomy] => category [description] => [parent] => 153 [count] => 9 [filter] => raw ) [47] => WP_Term Object ( [term_id] => 256 [name] => Buffers Discontinued Internal [slug] => buffers-discontinued [term_group] => 0 [term_taxonomy_id] => 256 [taxonomy] => category [description] => [parent] => 7 [count] => 8 [filter] => raw ) [48] => WP_Term Object ( [term_id] => 129 [name] => Buffers for CE FAQ [slug] => 25 [term_group] => 0 [term_taxonomy_id] => 129 [taxonomy] => category [description] => [parent] => 128 [count] => 18 [filter] => raw ) [49] => WP_Term Object ( [term_id] => 208 [name] => Capillary Electrophoresis Information [slug] => 61 [term_group] => 0 [term_taxonomy_id] => 208 [taxonomy] => category [description] => [parent] => 4 [count] => 194 [filter] => raw ) [51] => WP_Term Object ( [term_id] => 128 [name] => CE and CZE FAQ [slug] => 13 [term_group] => 0 [term_taxonomy_id] => 128 [taxonomy] => category [description] => [parent] => 119 [count] => 71 [filter] => raw ) [52] => WP_Term Object ( [term_id] => 255 [name] => CElixir Products Internal [slug] => celixir-products [term_group] => 0 [term_taxonomy_id] => 255 [taxonomy] => category [description] => [parent] => 7 [count] => 116 [filter] => raw ) [54] => WP_Term Object ( [term_id] => 252 [name] => Chrom Syringes FAQ [slug] => chrom-syringes-faq [term_group] => 0 [term_taxonomy_id] => 252 [taxonomy] => category [description] => [parent] => 147 [count] => 7 [filter] => raw ) [55] => WP_Term Object ( [term_id] => 271 [name] => Chromatography Accessories & Supplies Information [slug] => chromatography-accessories-supplies-information [term_group] => 0 [term_taxonomy_id] => 271 [taxonomy] => category [description] => [parent] => 4 [count] => 135 [filter] => raw ) [56] => WP_Term Object ( [term_id] => 212 [name] => Click To Chat Internal [slug] => 155 [term_group] => 0 [term_taxonomy_id] => 212 [taxonomy] => category [description] => [parent] => 5 [count] => 5 [filter] => raw ) [57] => WP_Term Object ( [term_id] => 289 [name] => Cogent Amide Information [slug] => cogent-amide-information [term_group] => 0 [term_taxonomy_id] => 289 [taxonomy] => category [description] => [parent] => 75 [count] => 9 [filter] => raw ) [58] => WP_Term Object ( [term_id] => 290 [name] => Cogent Bidentate C18 Information [slug] => cogent-bidentate-c18-information [term_group] => 0 [term_taxonomy_id] => 290 [taxonomy] => category [description] => [parent] => 75 [count] => 20 [filter] => raw ) [59] => WP_Term Object ( [term_id] => 291 [name] => Cogent Bidentate C8 Information [slug] => cogent-bidentate-c8 [term_group] => 0 [term_taxonomy_id] => 291 [taxonomy] => category [description] => [parent] => 75 [count] => 7 [filter] => raw ) [60] => WP_Term Object ( [term_id] => 148 [name] => Cogent Column Filters - FAQ [slug] => 37 [term_group] => 0 [term_taxonomy_id] => 148 [taxonomy] => category [description] => [parent] => 147 [count] => 24 [filter] => raw ) [61] => WP_Term Object ( [term_id] => 292 [name] => Cogent Diamond Hydride Information [slug] => cogent-diamond-hydride-information [term_group] => 0 [term_taxonomy_id] => 292 [taxonomy] => category [description] => [parent] => 75 [count] => 75 [filter] => raw ) [62] => WP_Term Object ( [term_id] => 297 [name] => Cogent DIOL Information [slug] => cogent-diol-information [term_group] => 0 [term_taxonomy_id] => 297 [taxonomy] => category [description] => [parent] => 75 [count] => 7 [filter] => raw ) [63] => WP_Term Object ( [term_id] => 299 [name] => Cogent HPS Column Information [slug] => cogent-hps-column-information [term_group] => 0 [term_taxonomy_id] => 299 [taxonomy] => category [description] => [parent] => 298 [count] => 7 [filter] => raw ) [64] => WP_Term Object ( [term_id] => 207 [name] => Cogent HPS FAQ [slug] => 34 [term_group] => 0 [term_taxonomy_id] => 207 [taxonomy] => category [description] => [parent] => 253 [count] => 11 [filter] => raw ) [65] => WP_Term Object ( [term_id] => 298 [name] => Cogent HPS, RP and NP Column Information [slug] => cogent-hps-rp-and-np-column-information [term_group] => 0 [term_taxonomy_id] => 298 [taxonomy] => category [description] => [parent] => 76 [count] => 10 [filter] => raw ) [66] => WP_Term Object ( [term_id] => 293 [name] => Cogent Phenyl Hydride Information [slug] => cogent-phenyl-hydride-information [term_group] => 0 [term_taxonomy_id] => 293 [taxonomy] => category [description] => [parent] => 75 [count] => 20 [filter] => raw ) [67] => WP_Term Object ( [term_id] => 300 [name] => Cogent RP Column Information [slug] => cogent-rp-column-information [term_group] => 0 [term_taxonomy_id] => 300 [taxonomy] => category [description] => [parent] => 298 [count] => 4 [filter] => raw ) [68] => WP_Term Object ( [term_id] => 295 [name] => Cogent Silica-C Information [slug] => cogent-silica-c-information [term_group] => 0 [term_taxonomy_id] => 295 [taxonomy] => category [description] => [parent] => 75 [count] => 14 [filter] => raw ) [69] => WP_Term Object ( [term_id] => 296 [name] => Cogent UDA Information [slug] => cogent-uda-information [term_group] => 0 [term_taxonomy_id] => 296 [taxonomy] => category [description] => [parent] => 75 [count] => 12 [filter] => raw ) [70] => WP_Term Object ( [term_id] => 294 [name] => Cogent UDC-Cholesterol Information [slug] => cogent-udc-cholesterol-information [term_group] => 0 [term_taxonomy_id] => 294 [taxonomy] => category [description] => [parent] => 75 [count] => 14 [filter] => raw ) [71] => WP_Term Object ( [term_id] => 276 [name] => Column Couplers [slug] => column-couplers [term_group] => 0 [term_taxonomy_id] => 276 [taxonomy] => category [description] => [parent] => 271 [count] => 14 [filter] => raw ) [72] => WP_Term Object ( [term_id] => 167 [name] => Column Hardware FAQ [slug] => 137 [term_group] => 0 [term_taxonomy_id] => 167 [taxonomy] => category [description] => [parent] => 153 [count] => 72 [filter] => raw ) [73] => WP_Term Object ( [term_id] => 135 [name] => Controlled Flow Capillary FAQ [slug] => 32 [term_group] => 0 [term_taxonomy_id] => 135 [taxonomy] => category [description] => [parent] => 128 [count] => 32 [filter] => raw ) [74] => WP_Term Object ( [term_id] => 249 [name] => Cornerstone Scientific Internal [slug] => cornerstone-scientific [term_group] => 0 [term_taxonomy_id] => 249 [taxonomy] => category [description] => [parent] => 5 [count] => 8 [filter] => raw ) [75] => WP_Term Object ( [term_id] => 127 [name] => Crimp Top Vials & Cap FAQ [slug] => 184 [term_group] => 0 [term_taxonomy_id] => 127 [taxonomy] => category [description] => [parent] => 120 [count] => 79 [filter] => raw ) [76] => WP_Term Object ( [term_id] => 222 [name] => Customer Care Department [slug] => 114 [term_group] => 0 [term_taxonomy_id] => 222 [taxonomy] => category [description] => [parent] => 210 [count] => 3 [filter] => raw ) [78] => WP_Term Object ( [term_id] => 268 [name] => Di-Ad Column Connector Information [slug] => di-ad-column-connectors [term_group] => 0 [term_taxonomy_id] => 268 [taxonomy] => category [description] => [parent] => 271 [count] => 20 [filter] => raw ) [79] => WP_Term Object ( [term_id] => 157 [name] => Diamond Hydride FAQ [slug] => cogent-diamond-hydride [term_group] => 0 [term_taxonomy_id] => 157 [taxonomy] => category [description] => [parent] => 153 [count] => 84 [filter] => raw ) [80] => WP_Term Object ( [term_id] => 158 [name] => Diol FAQ [slug] => 145 [term_group] => 0 [term_taxonomy_id] => 158 [taxonomy] => category [description] => [parent] => 153 [count] => 6 [filter] => raw ) [81] => WP_Term Object ( [term_id] => 7 [name] => Discontinued Products Internal [slug] => discontinued-products [term_group] => 0 [term_taxonomy_id] => 7 [taxonomy] => category [description] => [parent] => 5 [count] => 38 [filter] => raw ) [82] => WP_Term Object ( [term_id] => 216 [name] => Employee Cell Phone Internal [slug] => 131 [term_group] => 0 [term_taxonomy_id] => 216 [taxonomy] => category [description] => [parent] => 5 [count] => 1 [filter] => raw ) [83] => WP_Term Object ( [term_id] => 219 [name] => Employee Manual Internal [slug] => 103 [term_group] => 0 [term_taxonomy_id] => 219 [taxonomy] => category [description] => [parent] => 5 [count] => 26 [filter] => raw ) [84] => WP_Term Object ( [term_id] => 139 [name] => Equipment FAQ [slug] => 17 [term_group] => 0 [term_taxonomy_id] => 139 [taxonomy] => category [description] => [parent] => 119 [count] => 74 [filter] => raw ) [85] => WP_Term Object ( [term_id] => 140 [name] => Filter Degasser FAQ [slug] => 20 [term_group] => 0 [term_taxonomy_id] => 140 [taxonomy] => category [description] => [parent] => 147 [count] => 22 [filter] => raw ) [86] => WP_Term Object ( [term_id] => 147 [name] => Filtration FAQ [slug] => 14 [term_group] => 0 [term_taxonomy_id] => 147 [taxonomy] => category [description] => [parent] => 119 [count] => 75 [filter] => raw ) [87] => WP_Term Object ( [term_id] => 220 [name] => Financial Reporting [slug] => 117 [term_group] => 0 [term_taxonomy_id] => 220 [taxonomy] => category [description] => [parent] => 211 [count] => 1 [filter] => raw ) [88] => WP_Term Object ( [term_id] => 152 [name] => Fittings & Tubing for HPLC FAQ [slug] => 12 [term_group] => 0 [term_taxonomy_id] => 152 [taxonomy] => category [description] => [parent] => 119 [count] => 116 [filter] => raw ) [89] => WP_Term Object ( [term_id] => 273 [name] => Fittings Connectors Nuts Ferrules Information [slug] => fittings-connectors-nuts-ferrules-information [term_group] => 0 [term_taxonomy_id] => 273 [taxonomy] => category [description] => [parent] => 271 [count] => 45 [filter] => raw ) [90] => WP_Term Object ( [term_id] => 279 [name] => Flanging Tool Information [slug] => flanging-tool-information [term_group] => 0 [term_taxonomy_id] => 279 [taxonomy] => category [description] => [parent] => 271 [count] => 2 [filter] => raw ) [91] => WP_Term Object ( [term_id] => 119 [name] => Frequently Asked Questions?? [slug] => 8 [term_group] => 0 [term_taxonomy_id] => 119 [taxonomy] => category [description] => [parent] => 4 [count] => 537 [filter] => raw ) [92] => WP_Term Object ( [term_id] => 303 [name] => Frits [slug] => frits [term_group] => 0 [term_taxonomy_id] => 303 [taxonomy] => category [description] => [parent] => 271 [count] => 15 [filter] => raw ) [93] => WP_Term Object ( [term_id] => 69 [name] => General Information [slug] => 141 [term_group] => 0 [term_taxonomy_id] => 69 [taxonomy] => category [description] => [parent] => 4 [count] => 99 [filter] => raw ) [94] => WP_Term Object ( [term_id] => 223 [name] => General Policies & Procedure Internal [slug] => 109 [term_group] => 0 [term_taxonomy_id] => 223 [taxonomy] => category [description] => [parent] => 210 [count] => 24 [filter] => raw ) [95] => WP_Term Object ( [term_id] => 280 [name] => Guard Column Information [slug] => guard-column-information [term_group] => 0 [term_taxonomy_id] => 280 [taxonomy] => category [description] => [parent] => 76 [count] => 19 [filter] => raw ) [96] => WP_Term Object ( [term_id] => 159 [name] => Guard Columns FAQ [slug] => 81 [term_group] => 0 [term_taxonomy_id] => 159 [taxonomy] => category [description] => [parent] => 153 [count] => 27 [filter] => raw ) [97] => WP_Term Object ( [term_id] => 123 [name] => Headspace Vial FAQ [slug] => 19 [term_group] => 0 [term_taxonomy_id] => 123 [taxonomy] => category [description] => [parent] => 120 [count] => 58 [filter] => raw ) [98] => WP_Term Object ( [term_id] => 282 [name] => Headspace Vials & Caps [slug] => headspace-vials-caps [term_group] => 0 [term_taxonomy_id] => 282 [taxonomy] => category [description] => [parent] => 250 [count] => 27 [filter] => raw ) [99] => WP_Term Object ( [term_id] => 70 [name] => How To... Information [slug] => 76 [term_group] => 0 [term_taxonomy_id] => 70 [taxonomy] => category [description] => [parent] => 4 [count] => 155 [filter] => raw ) [100] => WP_Term Object ( [term_id] => 288 [name] => HPLC & GC Standard Vials Caps & Inserts [slug] => hplc-and-gc-vials-caps-inserts [term_group] => 0 [term_taxonomy_id] => 288 [taxonomy] => category [description] => [parent] => 250 [count] => 64 [filter] => raw ) [101] => WP_Term Object ( [term_id] => 76 [name] => HPLC Column Information [slug] => 49 [term_group] => 0 [term_taxonomy_id] => 76 [taxonomy] => category [description] => [parent] => 4 [count] => 283 [filter] => raw ) [102] => WP_Term Object ( [term_id] => 153 [name] => HPLC Columns FAQ [slug] => 11 [term_group] => 0 [term_taxonomy_id] => 153 [taxonomy] => category [description] => [parent] => 119 [count] => 173 [filter] => raw ) [103] => WP_Term Object ( [term_id] => 254 [name] => HPLC Columns Old [slug] => hplc-columns-old [term_group] => 0 [term_taxonomy_id] => 254 [taxonomy] => category [description] => [parent] => 7 [count] => 3 [filter] => raw ) [104] => WP_Term Object ( [term_id] => 269 [name] => HPLC Primer [slug] => hplc-primer [term_group] => 0 [term_taxonomy_id] => 269 [taxonomy] => category [description] => [parent] => 4 [count] => 90 [filter] => raw ) [105] => WP_Term Object ( [term_id] => 283 [name] => HPLC Qualification [slug] => hplc-qualification [term_group] => 0 [term_taxonomy_id] => 283 [taxonomy] => category [description] => [parent] => 73 [count] => 67 [filter] => raw ) [106] => WP_Term Object ( [term_id] => 71 [name] => HPLC Suggestions and Information [slug] => 51 [term_group] => 0 [term_taxonomy_id] => 71 [taxonomy] => category [description] => [parent] => 4 [count] => 297 [filter] => raw ) [107] => WP_Term Object ( [term_id] => 77 [name] => HPLC Tips and Suggestions [slug] => 18 [term_group] => 0 [term_taxonomy_id] => 77 [taxonomy] => category [description] => [parent] => 71 [count] => 421 [filter] => raw ) [108] => WP_Term Object ( [term_id] => 124 [name] => Inserts FAQ [slug] => 158 [term_group] => 0 [term_taxonomy_id] => 124 [taxonomy] => category [description] => [parent] => 120 [count] => 50 [filter] => raw ) [109] => WP_Term Object ( [term_id] => 5 [name] => INTERNAL ONLY - CONFIDENTIAL [slug] => 102 [term_group] => 0 [term_taxonomy_id] => 5 [taxonomy] => category [description] => [parent] => 0 [count] => 279 [filter] => raw ) [110] => WP_Term Object ( [term_id] => 230 [name] => Inventory Module [slug] => 166 [term_group] => 0 [term_taxonomy_id] => 230 [taxonomy] => category [description] => [parent] => 225 [count] => 2 [filter] => raw ) [111] => WP_Term Object ( [term_id] => 215 [name] => IT Computer Warriors Internal [slug] => 156 [term_group] => 0 [term_taxonomy_id] => 215 [taxonomy] => category [description] => [parent] => 5 [count] => 2 [filter] => raw ) [112] => WP_Term Object ( [term_id] => 145 [name] => Knitted Reactor Coils [slug] => 28 [term_group] => 0 [term_taxonomy_id] => 145 [taxonomy] => category [description] => [parent] => 139 [count] => 14 [filter] => raw ) [113] => WP_Term Object ( [term_id] => 206 [name] => Labelled Vials [slug] => 179 [term_group] => 0 [term_taxonomy_id] => 206 [taxonomy] => category [description] => [parent] => 205 [count] => 4 [filter] => raw ) [114] => WP_Term Object ( [term_id] => 224 [name] => Marketing Department [slug] => 119 [term_group] => 0 [term_taxonomy_id] => 224 [taxonomy] => category [description] => [parent] => 210 [count] => 16 [filter] => raw ) [115] => WP_Term Object ( [term_id] => 122 [name] => MicroSolv Autosampler Vials FAQ [slug] => 43 [term_group] => 0 [term_taxonomy_id] => 122 [taxonomy] => category [description] => [parent] => 120 [count] => 116 [filter] => raw ) [116] => WP_Term Object ( [term_id] => 302 [name] => Mobile Phase Bottle Information [slug] => mobile-phase-bottle-information [term_group] => 0 [term_taxonomy_id] => 302 [taxonomy] => category [description] => [parent] => 271 [count] => 14 [filter] => raw ) [117] => WP_Term Object ( [term_id] => 270 [name] => Mobile Phase Bottles FAQ [slug] => mobile-phase-bottles-faq [term_group] => 0 [term_taxonomy_id] => 270 [taxonomy] => category [description] => [parent] => 119 [count] => 17 [filter] => raw ) [118] => WP_Term Object ( [term_id] => 170 [name] => Mobile Phase FAQ [slug] => 72 [term_group] => 0 [term_taxonomy_id] => 170 [taxonomy] => category [description] => [parent] => 119 [count] => 121 [filter] => raw ) [119] => WP_Term Object ( [term_id] => 78 [name] => Mobile Phase Suggestions [slug] => 58 [term_group] => 0 [term_taxonomy_id] => 78 [taxonomy] => category [description] => [parent] => 71 [count] => 135 [filter] => raw ) [120] => WP_Term Object ( [term_id] => 231 [name] => MTCP [slug] => 112 [term_group] => 0 [term_taxonomy_id] => 231 [taxonomy] => category [description] => [parent] => 210 [count] => 6 [filter] => raw ) [121] => WP_Term Object ( [term_id] => 233 [name] => Online Book of Standards [slug] => 148 [term_group] => 0 [term_taxonomy_id] => 233 [taxonomy] => category [description] => [parent] => 232 [count] => 2 [filter] => raw ) [122] => WP_Term Object ( [term_id] => 2 [name] => ONLINE TOOLS [slug] => 57 [term_group] => 0 [term_taxonomy_id] => 2 [taxonomy] => category [description] => [parent] => 0 [count] => 2 [filter] => raw ) [123] => WP_Term Object ( [term_id] => 301 [name] => Other Columns Information [slug] => other-columns-information [term_group] => 0 [term_taxonomy_id] => 301 [taxonomy] => category [description] => [parent] => 76 [count] => 17 [filter] => raw ) [124] => WP_Term Object ( [term_id] => 232 [name] => Packaging Department [slug] => 111 [term_group] => 0 [term_taxonomy_id] => 232 [taxonomy] => category [description] => [parent] => 210 [count] => 3 [filter] => raw ) [125] => WP_Term Object ( [term_id] => 168 [name] => Partisil & Partisphere FAQ [slug] => 157 [term_group] => 0 [term_taxonomy_id] => 168 [taxonomy] => category [description] => [parent] => 253 [count] => 10 [filter] => raw ) [126] => WP_Term Object ( [term_id] => 267 [name] => Phenyl Hydride FAQ [slug] => phenyl-hydride-faq [term_group] => 0 [term_taxonomy_id] => 267 [taxonomy] => category [description] => [parent] => 153 [count] => 18 [filter] => raw ) [127] => WP_Term Object ( [term_id] => 144 [name] => Photochemical Reactor Internal [slug] => 27 [term_group] => 0 [term_taxonomy_id] => 144 [taxonomy] => category [description] => [parent] => 7 [count] => 10 [filter] => raw ) [128] => WP_Term Object ( [term_id] => 286 [name] => Plastic Vials [slug] => plastic-vials [term_group] => 0 [term_taxonomy_id] => 286 [taxonomy] => category [description] => [parent] => 250 [count] => 28 [filter] => raw ) [129] => WP_Term Object ( [term_id] => 72 [name] => Prep Chromatography Column Information [slug] => 75 [term_group] => 0 [term_taxonomy_id] => 72 [taxonomy] => category [description] => [parent] => 76 [count] => 25 [filter] => raw ) [130] => WP_Term Object ( [term_id] => 244 [name] => Pricing Policies [slug] => pricing-policies [term_group] => 0 [term_taxonomy_id] => 244 [taxonomy] => category [description] => [parent] => 224 [count] => 5 [filter] => raw ) [131] => WP_Term Object ( [term_id] => 210 [name] => Procedures Internal [slug] => 104 [term_group] => 0 [term_taxonomy_id] => 210 [taxonomy] => category [description] => [parent] => 5 [count] => 5 [filter] => raw ) [133] => WP_Term Object ( [term_id] => 234 [name] => Purchasing Department [slug] => 107 [term_group] => 0 [term_taxonomy_id] => 234 [taxonomy] => category [description] => [parent] => 210 [count] => 13 [filter] => raw ) [134] => WP_Term Object ( [term_id] => 171 [name] => Qualification FAQ [slug] => 16 [term_group] => 0 [term_taxonomy_id] => 171 [taxonomy] => category [description] => [parent] => 119 [count] => 84 [filter] => raw ) [135] => WP_Term Object ( [term_id] => 73 [name] => Qualification Information [slug] => 74 [term_group] => 0 [term_taxonomy_id] => 73 [taxonomy] => category [description] => [parent] => 4 [count] => 83 [filter] => raw ) [136] => WP_Term Object ( [term_id] => 285 [name] => Qualification Tech Information [slug] => qualification-tech-information [term_group] => 0 [term_taxonomy_id] => 285 [taxonomy] => category [description] => [parent] => 73 [count] => 35 [filter] => raw ) [137] => WP_Term Object ( [term_id] => 242 [name] => Qx2 [slug] => 178 [term_group] => 0 [term_taxonomy_id] => 242 [taxonomy] => category [description] => [parent] => 7 [count] => 1 [filter] => raw ) [138] => WP_Term Object ( [term_id] => 235 [name] => Receiving Department [slug] => 110 [term_group] => 0 [term_taxonomy_id] => 235 [taxonomy] => category [description] => [parent] => 210 [count] => 4 [filter] => raw ) [139] => WP_Term Object ( [term_id] => 253 [name] => Reversed Phase Columns FAQ [slug] => reversed-phase-columns-faq [term_group] => 0 [term_taxonomy_id] => 253 [taxonomy] => category [description] => [parent] => 153 [count] => 51 [filter] => raw ) [140] => WP_Term Object ( [term_id] => 281 [name] => RSA Family of Vials [slug] => rsa-family-of-vials [term_group] => 0 [term_taxonomy_id] => 281 [taxonomy] => category [description] => [parent] => 250 [count] => 58 [filter] => raw ) [141] => WP_Term Object ( [term_id] => 125 [name] => RSA Vials FAQ [slug] => 78 [term_group] => 0 [term_taxonomy_id] => 125 [taxonomy] => category [description] => [parent] => 120 [count] => 110 [filter] => raw ) [142] => WP_Term Object ( [term_id] => 225 [name] => SAGE 100 [slug] => 121 [term_group] => 0 [term_taxonomy_id] => 225 [taxonomy] => category [description] => [parent] => 210 [count] => 3 [filter] => raw ) [144] => WP_Term Object ( [term_id] => 236 [name] => Sales Department Inbound [slug] => 105 [term_group] => 0 [term_taxonomy_id] => 236 [taxonomy] => category [description] => [parent] => 210 [count] => 24 [filter] => raw ) [145] => WP_Term Object ( [term_id] => 237 [name] => Sales Department Outbound [slug] => 120 [term_group] => 0 [term_taxonomy_id] => 237 [taxonomy] => category [description] => [parent] => 210 [count] => 4 [filter] => raw ) [146] => WP_Term Object ( [term_id] => 226 [name] => Sales Order Module [slug] => 125 [term_group] => 0 [term_taxonomy_id] => 226 [taxonomy] => category [description] => [parent] => 225 [count] => 3 [filter] => raw ) [147] => WP_Term Object ( [term_id] => 3 [name] => SALES POLICIES [slug] => 15 [term_group] => 0 [term_taxonomy_id] => 3 [taxonomy] => category [description] => [parent] => 0 [count] => 16 [filter] => raw ) [148] => WP_Term Object ( [term_id] => 278 [name] => Sample Loops [slug] => sample-loops [term_group] => 0 [term_taxonomy_id] => 278 [taxonomy] => category [description] => [parent] => 271 [count] => 9 [filter] => raw ) [149] => WP_Term Object ( [term_id] => 238 [name] => SFDC Salesforce.com [slug] => 106 [term_group] => 0 [term_taxonomy_id] => 238 [taxonomy] => category [description] => [parent] => 210 [count] => 8 [filter] => raw ) [150] => WP_Term Object ( [term_id] => 239 [name] => Shipping Department [slug] => 108 [term_group] => 0 [term_taxonomy_id] => 239 [taxonomy] => category [description] => [parent] => 210 [count] => 23 [filter] => raw ) [151] => WP_Term Object ( [term_id] => 163 [name] => Silica-C FAQ [slug] => 39 [term_group] => 0 [term_taxonomy_id] => 163 [taxonomy] => category [description] => [parent] => 153 [count] => 22 [filter] => raw ) [152] => WP_Term Object ( [term_id] => 274 [name] => Sparging Stone Information [slug] => sparging-stone-information [term_group] => 0 [term_taxonomy_id] => 274 [taxonomy] => category [description] => [parent] => 271 [count] => 20 [filter] => raw ) [153] => WP_Term Object ( [term_id] => 150 [name] => Sparging Stones FAQ [slug] => 144 [term_group] => 0 [term_taxonomy_id] => 150 [taxonomy] => category [description] => [parent] => 119 [count] => 20 [filter] => raw ) [154] => WP_Term Object ( [term_id] => 118 [name] => Syringe Filters and Filtration Information [slug] => 73 [term_group] => 0 [term_taxonomy_id] => 118 [taxonomy] => category [description] => [parent] => 4 [count] => 51 [filter] => raw ) [155] => WP_Term Object ( [term_id] => 149 [name] => Syringe Filters FAQ [slug] => 38 [term_group] => 0 [term_taxonomy_id] => 149 [taxonomy] => category [description] => [parent] => 147 [count] => 43 [filter] => raw ) [156] => WP_Term Object ( [term_id] => 142 [name] => Syringe Pump Handheld [slug] => 45 [term_group] => 0 [term_taxonomy_id] => 142 [taxonomy] => category [description] => [parent] => 7 [count] => 0 [filter] => raw ) [157] => WP_Term Object ( [term_id] => 209 [name] => Technical Support Dept Internal [slug] => 113 [term_group] => 0 [term_taxonomy_id] => 209 [taxonomy] => category [description] => [parent] => 5 [count] => 44 [filter] => raw ) [158] => WP_Term Object ( [term_id] => 228 [name] => Templates Internal [slug] => 122 [term_group] => 0 [term_taxonomy_id] => 228 [taxonomy] => category [description] => [parent] => 5 [count] => 16 [filter] => raw ) [159] => WP_Term Object ( [term_id] => 8 [name] => TG-14 In-line Degasser [slug] => 171 [term_group] => 0 [term_taxonomy_id] => 8 [taxonomy] => category [description] => [parent] => 7 [count] => 0 [filter] => raw ) [160] => WP_Term Object ( [term_id] => 141 [name] => Tips Liquid Handling [slug] => 48 [term_group] => 0 [term_taxonomy_id] => 141 [taxonomy] => category [description] => [parent] => 139 [count] => 6 [filter] => raw ) [161] => WP_Term Object ( [term_id] => 217 [name] => Tools & Equipment Internal [slug] => 130 [term_group] => 0 [term_taxonomy_id] => 217 [taxonomy] => category [description] => [parent] => 5 [count] => 8 [filter] => raw ) [162] => WP_Term Object ( [term_id] => 146 [name] => Tools Information [slug] => 88 [term_group] => 0 [term_taxonomy_id] => 146 [taxonomy] => category [description] => [parent] => 271 [count] => 23 [filter] => raw ) [163] => WP_Term Object ( [term_id] => 74 [name] => Trouble Shooting Suggestions [slug] => 50 [term_group] => 0 [term_taxonomy_id] => 74 [taxonomy] => category [description] => [parent] => 71 [count] => 260 [filter] => raw ) [164] => WP_Term Object ( [term_id] => 81 [name] => Tubing Information [slug] => 77 [term_group] => 0 [term_taxonomy_id] => 81 [taxonomy] => category [description] => [parent] => 271 [count] => 94 [filter] => raw ) [165] => WP_Term Object ( [term_id] => 75 [name] => TYPE-C Column Information [slug] => 53 [term_group] => 0 [term_taxonomy_id] => 75 [taxonomy] => category [description] => [parent] => 76 [count] => 215 [filter] => raw ) [166] => WP_Term Object ( [term_id] => 164 [name] => TYPE-C in General FAQ [slug] => 40 [term_group] => 0 [term_taxonomy_id] => 164 [taxonomy] => category [description] => [parent] => 153 [count] => 132 [filter] => raw ) [167] => WP_Term Object ( [term_id] => 287 [name] => U-2D Sample Management System [slug] => u-2d-sample-management-system [term_group] => 0 [term_taxonomy_id] => 287 [taxonomy] => category [description] => [parent] => 250 [count] => 18 [filter] => raw ) [168] => WP_Term Object ( [term_id] => 126 [name] => U-2D Sample MGT FAQ [slug] => 172 [term_group] => 0 [term_taxonomy_id] => 126 [taxonomy] => category [description] => [parent] => 120 [count] => 57 [filter] => raw ) [169] => WP_Term Object ( [term_id] => 162 [name] => UDC-Cholesterol FAQ [slug] => 24 [term_group] => 0 [term_taxonomy_id] => 162 [taxonomy] => category [description] => [parent] => 153 [count] => 19 [filter] => raw ) [171] => WP_Term Object ( [term_id] => 275 [name] => Unions [slug] => unions [term_group] => 0 [term_taxonomy_id] => 275 [taxonomy] => category [description] => [parent] => 271 [count] => 25 [filter] => raw ) [172] => WP_Term Object ( [term_id] => 284 [name] => UV-vis Qualification [slug] => uv-vis-qualification [term_group] => 0 [term_taxonomy_id] => 284 [taxonomy] => category [description] => [parent] => 73 [count] => 19 [filter] => raw ) [173] => WP_Term Object ( [term_id] => 260 [name] => Vial Centrifuge [slug] => vial-centrifuge [term_group] => 0 [term_taxonomy_id] => 260 [taxonomy] => category [description] => [parent] => 5 [count] => 2 [filter] => raw ) [174] => WP_Term Object ( [term_id] => 121 [name] => Vials & Caps General FAQ [slug] => 10 [term_group] => 0 [term_taxonomy_id] => 121 [taxonomy] => category [description] => [parent] => 120 [count] => 145 [filter] => raw ) [175] => WP_Term Object ( [term_id] => 218 [name] => VOIXIS Phone Internal [slug] => 129 [term_group] => 0 [term_taxonomy_id] => 218 [taxonomy] => category [description] => [parent] => 5 [count] => 1 [filter] => raw ) [176] => WP_Term Object ( [term_id] => 314 [name] => VOIXIS PHONE INTERNAL - ARCHIVED [slug] => voixis-phone-internal-archived [term_group] => 0 [term_taxonomy_id] => 314 [taxonomy] => category [description] => [parent] => 218 [count] => 16 [filter] => raw ) [177] => WP_Term Object ( [term_id] => 241 [name] => Warehousing [slug] => 159 [term_group] => 0 [term_taxonomy_id] => 241 [taxonomy] => category [description] => [parent] => 210 [count] => 1 [filter] => raw ) [178] => WP_Term Object ( [term_id] => 240 [name] => Websites [slug] => 115 [term_group] => 0 [term_taxonomy_id] => 240 [taxonomy] => category [description] => [parent] => 210 [count] => 2 [filter] => raw ) [179] => WP_Term Object ( [term_id] => 83 [name] => White Papers [slug] => 52 [term_group] => 0 [term_taxonomy_id] => 83 [taxonomy] => category [description] => [parent] => 4 [count] => 6 [filter] => raw ) [180] => WP_Term Object ( [term_id] => 137 [name] => Window Maker FAQ [slug] => 41 [term_group] => 0 [term_taxonomy_id] => 137 [taxonomy] => category [description] => [parent] => 128 [count] => 26 [filter] => raw ) [181] => WP_Term Object ( [term_id] => 277 [name] => Window Maker Information [slug] => window-maker-information [term_group] => 0 [term_taxonomy_id] => 277 [taxonomy] => category [description] => [parent] => 208 [count] => 21 [filter] => raw ) [182] => WP_Term Object ( [term_id] => 304 [name] => Work Flow Documents INTERNAL [slug] => work-flow-documents-internal [term_group] => 0 [term_taxonomy_id] => 304 [taxonomy] => category [description] => [parent] => 5 [count] => 1 [filter] => raw ) [183] => WP_Term Object ( [term_id] => 227 [name] => Work Order [slug] => 136 [term_group] => 0 [term_taxonomy_id] => 227 [taxonomy] => category [description] => [parent] => 225 [count] => 10 [filter] => raw ) [184] => WP_Term Object ( [term_id] => 138 [name] => Zero Flow Capillary FAQ [slug] => 42 [term_group] => 0 [term_taxonomy_id] => 138 [taxonomy] => category [description] => [parent] => 128 [count] => 29 [filter] => raw ) ) POST QUERY: POST QUERY RESULTS
ARTICLES, APPNOTES, FAQ (9292)
- AppNotes Library (1888)
  - AppNotes Alternate Generic Methods (26)
  - AppNotes ANP/HILIC Methods (198)
  - AppNotes Listed by Column (485)
    
    AppNotes Cogent Biphenyl (1)
    
    AppNotes Cogent HPS (4)
    
    AppNotes Cogent Phenyl Hexyl (3)
    
    AppNotes Cogent RP C8 (8)
    
    AppNotes RP C18 (22)
    
    AppNotes TYPE-C Columns (395)
    
    AppNotes Cogent Amide (11)
    
    AppNotes Cogent Bidentate C18 (96)
    
    AppNotes Cogent Bidentate C8 (19)
    
    AppNotes Cogent Bidentate C8 300 (5)
    
    AppNotes Cogent Diamond Hydride (181)
    
    AppNotes Cogent Diol (7)
    
    AppNotes Cogent Phenyl Hydride (40)
    
    AppNotes Cogent Silica-C (7)
    
    AppNotes Cogent UDA (7)
    
    AppNotes Cogent UDC Cholesterol (19)
  - AppNotes Listed by Compound (1)
  - AppNotes Listed by Discipline (467)
    
    AppNotes AgroChem (11)
    
    AppNotes Chemicals/Energy (24)
    
    AppNotes Food and Beverages (81)
    
    AppNotes Metabolites (76)
    
    AppNotes Pharmaceuticals (228)
    
    AppNotes Proteins Peptides (9)
  - AppNotes Normal Phase (4)
  - AppNotes Reversed Phase Methods (184)
  - AppNotes RSA Vials (6)
- Autosampler Vials Information (319)
  - Headspace Vials & Caps (27)
  - HPLC & GC Standard Vials Caps & Inserts (64)
  - Plastic Vials (28)
  - RSA Family of Vials (58)
  - U-2D Sample Management System (18)
- Capillary Electrophoresis Information (215)
  - Window Maker Information (21)
- Chromatography Accessories & Supplies Information (441)
  - Column Couplers (14)
  - Di-Ad Column Connector Information (20)
  - Fittings Connectors Nuts Ferrules Information (45)
  - Flanging Tool Information (2)
  - Frits (15)
  - Mobile Phase Bottle Information (14)
  - Sample Loops (9)
  - Sparging Stone Information (20)
  - Tools Information (25)
    
    Beta Tool Information (2)
  - Tubing Information (94)
  - Unions (25)
- Frequently Asked Questions?? (3402)
  - Autosampler Vials FAQ (735)
    
    Crimp Top Vials & Cap FAQ (79)
    
    Headspace Vial FAQ (58)
    
    Inserts FAQ (50)
    
    MicroSolv Autosampler Vials FAQ (116)
    
    RSA Vials FAQ (110)
    
    U-2D Sample MGT FAQ (57)
    
    Vials & Caps General FAQ (145)
  - CE and CZE FAQ (176)
    
    Buffers for CE FAQ (18)
    
    Controlled Flow Capillary FAQ (32)
    
    Window Maker FAQ (26)
    
    Zero Flow Capillary FAQ (29)
  - Equipment FAQ (94)
    
    Knitted Reactor Coils (14)
    
    Tips Liquid Handling (6)
  - Filtration FAQ (171)
    
    Chrom Syringes FAQ (7)
    
    Cogent Column Filters – FAQ (24)
    
    Filter Degasser FAQ (22)
    
    Syringe Filters FAQ (43)
  - Fittings & Tubing for HPLC FAQ (116)
  - HPLC Columns FAQ (818)
    
    2.o™ HPLC Columns FAQ (99)
    
    Amide FAQ (8)
    
    Bidentate C18 FAQ (26)
    
    Bidentate C8 FAQ (9)
    
    Column Hardware FAQ (72)
    
    Diamond Hydride FAQ (84)
    
    Diol FAQ (6)
    
    Guard Columns FAQ (27)
    
    Phenyl Hydride FAQ (18)
    
    Reversed Phase Columns FAQ (72)
    
    Cogent HPS FAQ (11)
    
    Partisil & Partisphere FAQ (10)
    
    Silica-C FAQ (22)
    
    TYPE-C in General FAQ (132)
    
    UDC-Cholesterol FAQ (19)
  - Mobile Phase Bottles FAQ (17)
  - Mobile Phase FAQ (121)
  - Qualification FAQ (84)
  - Sparging Stones FAQ (20)
- General Information (99)
- How To… Information (155)
- HPLC Column Information (1015)
  - All PEEK HPLC Columns Information (32)
  - Cogent HPS, RP and NP Column Information (21)
    
    Cogent HPS Column Information (7)
    
    Cogent RP Column Information (4)
  - Guard Column Information (19)
  - Other Columns Information (17)
  - Prep Chromatography Column Information (25)
  - TYPE-C Column Information (393)
    
    Cogent Amide Information (9)
    
    Cogent Bidentate C18 Information (20)
    
    Cogent Bidentate C8 Information (7)
    
    Cogent Diamond Hydride Information (75)
    
    Cogent DIOL Information (7)
    
    Cogent Phenyl Hydride Information (20)
    
    Cogent Silica-C Information (14)
    
    Cogent UDA Information (12)
    
    Cogent UDC-Cholesterol Information (14)
- HPLC Primer (90)
- HPLC Suggestions and Information (1198)
  - ANP Aqueous Normal Phase Articles (85)
  - HPLC Tips and Suggestions (421)
  - Mobile Phase Suggestions (135)
  - Trouble Shooting Suggestions (260)
- Qualification Information (204)
  - HPLC Qualification (67)
  - Qualification Tech Information (35)
  - UV-vis Qualification (19)
- Syringe Filters and Filtration Information (51)
- White Papers (6)
INTERNAL ONLY – CONFIDENTIAL (817)
- App Notes Internal, USP & Archived (35)
- Archived (1)
- Autosampler Vials Internal (3)
- Click To Chat Internal (5)
- Cornerstone Scientific Internal (8)
- Discontinued Products Internal (176)
  - Buffers Discontinued Internal (8)
  - CElixir Products Internal (116)
  - HPLC Columns Old (3)
  - Photochemical Reactor Internal (10)
  - Qx2 (1)
  - Syringe Pump Handheld (0)
  - TG-14 In-line Degasser (0)
- Employee Cell Phone Internal (1)
- Employee Manual Internal (26)
- IT Computer Warriors Internal (2)
- Procedures Internal (237)
  - Accounting – AP/AR Department (30)
    
    Accounting Dept. Forms (7)
    
    Financial Reporting (1)
  - Customer Care Department (3)
  - General Policies & Procedure Internal (24)
  - Marketing Department (21)
    
    Pricing Policies (5)
  - MTCP (6)
  - Packaging Department (5)
    
    Online Book of Standards (2)
  - Purchasing Department (13)
  - Receiving Department (4)
  - SAGE 100 (20)
    
    Accounts Receivable (2)
    
    Inventory Module (2)
    
    Sales Order Module (3)
    
    Work Order (10)
  - Sales Department Inbound (24)
  - Sales Department Outbound (4)
  - SFDC Salesforce.com (8)
  - Shipping Department (23)
  - Warehousing (1)
  - Websites (2)
- Technical Support Dept Internal (44)
- Templates Internal (16)
- Tools & Equipment Internal (8)
- Vial Centrifuge (2)
- VOIXIS Phone Internal (17)
  - VOIXIS PHONE INTERNAL – ARCHIVED (16)
- Work Flow Documents INTERNAL (1)
ONLINE TOOLS (2)
SALES POLICIES (16)

April 14, 2020
Bill Ciccone

2.o™ HPLC Columns FAQ / ANP Aqueous Normal Phase Articles / ARTICLES, APPNOTES, FAQ / Cogent Diamond Hydride Information / Diamond Hydride FAQ / Frequently Asked Questions?? / HPLC Column Information / HPLC Suggestions and Information / HPLC Tips and Suggestions / Mobile Phase FAQ / Mobile Phase Suggestions / Trouble Shooting Suggestions / TYPE-C Column Information

Question: I am analyzing pyrazinoic acid (see structure below) by Aqueous Normal Phase ANP HPLC using the Cogent Diamond Hydride™ column. I observe two broad, split peaks for the analyte. I am using an acetonitrile / DI water / formic acid based mobile phase and my diluent is 50:50 methanol / acetonitrile. Retention is also low. What can I do to improve peak shape and / or retention?

Answer: The absence of water in your diluent may be contributing to the split broad peak shape. This has often been observed when using non-aqueous containing diluents with an aqueous/organic ANP mobile phase. Try a diluent of 50:50:0.1 acetonitrile / DI water / formic acid. If that does not solve the problem, try an ammonium acetate-based mobile phase and diluent (10mM).

You will probably be using negative ion mode LCMS in that case. With the carboxyl group ionized, you will probably be looking for the [M-H]^– ion. You can expect stronger retention with the carboxyl group ionized.

Download PDF

If you can’t find what you are looking for, email us

Related Articles

1) Sample diluents should match your starting mobile phase – Tips & Suggestions

2)

Contact Us