Retention and Separation is easy with the Cogent Diamond Hydride Column with the Method below. Normally this compound is very hard to get good peak shapes in Reversed Phase. Peak: 3,3′-Diaminobenzidine 215.1291 m/z (M+H)+ Method Conditions: Column: Cogent Diamond Hydride™, 4µm, 100Å Catalog No.: 70000-15P-2 Dimensions: 2.1 x 150 mm Solvents: A: 50% DI Water/ […]
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Acrylamide HPLC analysis method – AppNote
Easy & Precise Retention Attachments No 199 Acrylamide.pdf 0.3 Mb Download File
Advantage of Organic Normal Phase on C18 – AppNote
“Prep up” in NP and “Check Purity” in RP on the Same Analytical Column Attachments No 15 Advantage of Organic Normal Phase on C18.pdf 0.2 Mb Download File
Bisphenol A, S, & F Separated by HPLC – AppNote
Separation of Epoxy Resins Found in Consumer Products & Food Many consumer products are using BPA alternatives in recent years due to health concerns regarding toxicity of these compounds. An analytical HPLC method is shown in this AppNote to distinguish amongst these various Bisphenol compounds potentially in chemicals and foods. Excellent resolution was obtained for […]
Chlormequat & Mepiquat – AppNote
Plant Growth Regulators Attachments No 98 Chlormequat & Mepiquat.pdf 0.2 Mb Download File
DMAP, 4-dimethylaminopyridine analysis – AppNote
Analyzing the catalyst, DMAP, 4-Dimethylaminopyridine by HPLC Attachments No 109 Analyzing the Catalyst DMAP.pdf 0.1 Mb Download File
EDTA Analysis by HPLC – AppNote
EDTA does not have a significant Chromophore, so to achieve UV Detection, in the Method shown below we used a pre-Column reaction of a Solution of Ferric Chloride with the Sample. The resulting EDTA/Fe3+ has significant UV absorbance making this a very Sensitive Method. Ethylenediaminetetraacetic acid is extremely difficult to analyze by itself however in […]
EDTA ethylenediaminetetraacetic acid – AppNote
Very sensitive method for measuring EDTA Attachments No 74 Very Sensitive Method for EDTA pdf 0.1 Mb Download File
Glyphosate: Herbicide – AppNote
ANP Retention of an Extremely Polar Compound Attachments No 89 Glyphosate Herbicide.pdf 0.2 Mb Download File
Herbicide and Metabolites by LCMS – AppNote
Glufosinate, N-Acetylglufosinate, and Glufosinate Propanoic Acid Analysis of these Compounds can be problematic with other methods and poor peak shape may occur. In contrast, the Peaks obtained in this method are very sharp and symmetrical and can be applied to food products containing these types of Compounds. Peaks: 1. Glufosinate m/z 180.0431 [M-H]– 2. N-Acetylglufosinate […]
Herbicides & Metabolite Analysis by LCMS- AppNote
Glufosinate, N-Acetylglufosinate, Glufosinate Propanoic Acid, Diquat & Paraquat Two primary metabolites of Glufosinate are N-Acetylglufosinate and Glufosinate Propanoic Acid. Due to the potentially toxic nature of these Herbicides, analysis of their metabolites in a variety of sample matrices may be required. However, all three compounds are quite polar and therefore difficult to retain with conventional […]
Histamine Content in Red Wine by LCMS – AppNote
Demonstrating Low Histamine Content in Red Wine Samples Two red wine samples were tested for Histamine using the Cogent Diamond Hydride Column in an LC-MS method. The wine shown in Figure B was claimed to have virtually no Histamine but had no analytical evidence to support it. The claim was verified using this simple LCMS […]
Hydrophobic Compounds Analyzed by HPLC – AppNote
Shorter analysis time. Attachments No 44 Hydrophobic Compounds.pdf 0.2 Mb Download File
L-a-phenylglycine Antibiotic Analysis – AppNote
Using Cogent Silica-C™ column Attachments No 46 Phenylglycine for Antibiotic Analysis.pdf 0.3 Mb Download File
Metaldehyde in Slug Pellets Analyzed by LCMS – AppNote
Pesticide Formulation As Metaldehyde is a non-UV absorbing compound, other detection methods needed to be investigated besides conventional UV-HPLC. LC-MS was found to be a well-suited analysis by searching for the EIC corresponding to the [M+H]+ ion. Good retention and peak shape were observed for this analyte using the Cogent Bidentate C18 2.o™ Column. Peak: […]
Morphine Sulfate Tablet HPLC Method Transferred to Near UHPLC – AppNote
Standard 4um Particle Size Transferred to 2.o™ This application illustrates how methods developed using the 4µm Cogent Diamond Hydride Columns may be adapted for Cogent Diamond Hydride 2.o™ phases. Morphine shows slightly higher retention on the 2.o™ Column (average 7.311 min vs. 5.588 min). The efficiency is almost twice as high when using the smaller […]
Nonylphenol Analyzed by HPLC – AppNote
Separation of isomer peaks Attachments No 264 Nonylphenol.pdf 0.3 Mb Download File
Normal Phase Made Easier: Drying Solvents not Necessary – AppNote
Drying Solvents in the Mobile Phase not Necessary Attachments No 06 Normal Phase Made Easier.pdf 0.3 Mb Download File
Organic Alcohols Separated by HPLC – AppNote
Separation of the Organic Alcohols, 1-Phenyl-2-propanol and 2-Phenyl-1,2-propanediol by HPLC in 5 different lots to show excellent precision and very low RSD. Organic Alcohols Method Conditions: Column: Cogent Bidentate C18™, 4µm, 100Å Catalog No.: 40018-75P Dimensions: 4.6 x 75 mm Solvents: A: DI H20 / 0 .1% Formic Acid (v/v) B: Acetonitrile/ 0.1% Formic Acid […]
Organic Bases and Isomers at a Low pH – AppNote
Separation of Four Amine Containing Test Solutes The four test solutes selected for this application are both well-retained and well-resolved. In particular, the separation between the two isomers is readily accomplished, which may be difficult to achieve in Reversed Phase. This Method uses only Formic Acid as the Mobile Phase additive and is LCMS compatible. […]
Phenylglycine & Phenylalanine – AppNote
Separation of L – (+)-alpha-phenylglycine and L-phenylalanine using a simple LC-MS compatible mobile phase. UNDERIVATIZED Attachments No 48 Aromatic Amino Acids.pdf 0.2 Mb Download File
Polycyclic Aromatic Hydrocarbons (PAH) – AppNote
A Reverse Phase Separation Attachments No 29 Polycyclic Aromatic Hydrocarbons.pdf 0.2 Mb Download File
Pyrilamine & 4-Amino-3-Chloropyridine – AppNote
Unique Selectivity on an Amide Stationary Phase The Cogent Amide Column offers unique selectivity that may not be readily attainable with other phases. Two test solutes shown in this application note (Pyrilamine and 4-Amino-3-Chloropyridine) were baseline separated on the Cogent Amide Column (Figure A), but they co-eluted with no resolution on a different Cogent Column […]
Retain Highly Polar Compounds – HPLC method – AppNote
Analysis of Amino-Caproic Acid by a Simple LC-MS Method Attachments No 31 Retain Highly Polar Compounds.pdf 0.1 Mb Download File
Separation of Polar Solutes by HPLC – AppNote
Niacin, Riboflavin, Folic Acid, Pyridoxine, Metformin, Thiamine The Cogent Diol Column is a good addition to the TYPE-C™ Silica line of HPLC stationary phases. Here, a variety of common polar analytes are well-retained and separated. Peaks: 1. Ascorbic acid 2. Niacin 3. Riboflavin 4. Folic acid 5. Pyridoxine 6. Metformin 7. Thiamine Method Conditions Column: […]
Shape and Size Selectivity of Cholesterol Columns – AppNote
Separation in HPLC using the UDC Cholesterol Attachments No 42 Shape and Size Selectivity.pdf 0.2 Mb Download File
Shikimic Acid – AppNote
Ingredient for Production of Oseltamivir Attachments No 133 Shikimic Acid.pdf 0.2 Mb Download File
Shikimic Acid in Red Wine by LC-MS – AppNote
Ingredient for Production of Oseltamivir Attachments No 134 Shikimic Acid in Red Wine .pdf 0.3 Mb Download File
Substituted Phenols – HPLC method – AppNote
Substituted Phenols Attachments No 23 Separation by Functional Groups on a C18.pdf 0.2 Mb Download File
Tetrahydrocannabinol (THC) – AppNote
Psychoactive Component in Cannabis Tetrahydrocannabinol has several isomeric forms, which may account for the extra peaks observed in the Chromatogram below. Although their identities could not be confirmed, these peaks can be separated from the main peak using the Cogent Bidentate C18 Column. The compound is quite hydrophobic and therefore a relatively high organic content […]
Transfer HPLC Method to UHPLC with Hydrophobic Compounds – AppNote
Separation of Hydrophobic Compounds by HPLC & UHPLC This AppNote shows separation of analytes within a range of hydrophobicity. A simple gradient is used to elute all the compounds and baseline separation is obtained for the critical pair (peaks 4 and 5) and the least hydrophobic compound is adequately retained. A comparison is shown in […]
Tryptamine-Biogenic Amine HPLC method – AppNote
Analysis that is Easy, Fast and Precise Attachments No 51 Tryptamine-Biogenic Amine.pdf 0.1 Mb Download File
Urea Analysis – AppNote
Retention of highly polar compound Attachments No 229 Urea.pdf 0.4 Mb Download File
Urea analysis – AppNote
Fast, reproducible method Attachments No 111 Analysis of Urea.pdf 0.2 Mb Download File
Using a TYPE-C HPLC Column For Reversed Phase Chromatography – AppNote
Benzophenone Attachments No 41 Using a TYPE-C Column For Routine Reverse Phase.pdf 0.2 Mb Download File
Zinc-EDTA Complex – AppNote
No Ion Pair Agents Needed Using conventional analytical methods, retention of metal–EDTA complexes is accomplished using Ion Pair Reversed Phase Chromatography. However, the Ion Pair Agents used in the Mobile Phase are not compatible with Mass Spectrometry. In this AppNote, only Formic Acid is needed in the Mobile Phase in order to obtain retention of […]