Category: HPLC Columns FAQ
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A white film developed on my MS source so is this column packing material - FAQ
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Aqueous Normal Phase ANP and how can it is useful for polar compounds - Tech Information
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Aqueous Normal Phase ANP ballistic gradients compared to same in HILIC - Tips & Suggestions
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Aqueous Normal Phase ANP defined & compared to Reversed Phase & Normal Phase definitions HPLC
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Aqueous Normal Phase ANP solvent strength order - FAQ
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Are 10um pore size available in the Cogent Column Filters - FAQ
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Are Cogent 2.o HPLC columns compatible with Agilent 1290 Infinity II instruments - FAQ
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Are stainless steel tubing or fittings autoclavable - FAQ
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Are there HPLC columns that could be used to separate both polar and nonpolar compounds in a single run - FAQ
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Biological extracts Diamond Hydride columns and LCMS ion source diminished peak height problem - FAQ
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Calculate the ligand density of a bonded phase of an HPLC column - How To
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Calculating theoretical plates N at half height - How To
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Can Aqueous Normal Phase ANP methods be used to separate steroids - FAQ
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Can Cogent TYPE-C HPLC columns be used in supercritical fluid chromatography SFC - FAQ
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Can I backflush the Cogent column filter for longer in-service life - FAQ
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Can I change the filter element in the Cogent Column Filters - FAQ
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Can I use a silica or Silica-C guard column with an analytical column of a different phase - FAQ
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Can I use of the Cogent Diamond Hydride HPLC column above pH 7 in HPLC - FAQ
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Can I use the HSQ Kit with the longer column from the original PQ Kit - FAQ
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Can I use triethylamine TEA with Cogent Diamond Hydride columns - FAQ
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Can Reversed Phase and ANP mechanisms operate with the same effect at the same time - FAQ
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Can the Cogent Column Filters replace my HPLC guard columns - FAQ
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Causes of an HPLC column appearing to lack sensitivity in LCMS - Tips & Suggestions
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Changing column ID means changing your gradient - Tips & Suggestions
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Choose an appropriate guard column when using a Cogent TYPE-C HPLC column - How To
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Choosing the correct HPLC column coupler - How To
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Citric acid retention and peak shape has changed compared to data from a previous run what happened - FAQ
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Cogent amino HPLC columns designations for reversed or normal phase - Tech Information
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Cogent TYPE-C columns used in prep chromatography offer value - Tips & Suggestions
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Common cause of excessive back pressure in HPLC columns - FAQ
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Converting Cogent TYPE-C columns to normal phase after use in reversed phase - How To
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Cysteine analysis tips for LCMS - Tips & Suggestions
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Determine pore volume of an HPLC column using HPLC injections - How To
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Determining efficiency of HPLC methods 4um v 2um - FAQ
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Determining HPLC method accuracy - How To
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Do all PEEK HPLC fittings fit all receiving ports - FAQ
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Do Cogent TYPE-C Silica columns have a partial positive charge and if so is retention for basic compounds reduced because of this - Tech Information
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Do I need any special fittings to use the Cogent Column Filter with my current HPLC column - FAQ
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Do Partisil HPLC columns need an extra end fitting kit - FAQ
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Do Tanaka Plots for HPLC apply to columns used with Aqueous Normal Phase ANP methods - FAQ
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Do the Cogent Silica-C columns contain any carbon - FAQ
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Does the Hichrom brand column coupler work with the Partisil and Partisphere HPLC columns - FAQ
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Eliminate high background noise using a new Cogent HPLC column - Tips & Suggestions
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Eliminating shoulder peaks in an HPLC method using Cogent RP C18 columns - Tips & Suggestions
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Ferrule selection suggestions - Tech Information
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For the separation of polar intermediates in reversed phase HPLC which C18 column do you recommend - FAQ
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Frits smaller than 0.062 inches OD cannot be chamfered - Tech Information
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Guidelines for packing in the PEEK column hardware - Tips & Suggestions
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Helpful HPLC columns you may not know about - White Paper
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How a pulse from an HPLC pump affect the column and its performance - Tech Information
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How can Cogent TYPE-C HPLC columns offer faster results compared to other type of silica based columns - FAQ
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How can I fix split peaks with high back pressure in HPLC analyses - FAQ
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How can I separate capsaicinoids in hot sauce by HPLC - Tips & Suggestions
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How can I separate methacrylic acid and dodecyl benzene sulfonic acid - FAQ
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How do I connect a guard column to an analytical column - FAQ
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How do I stack multiple ColumnStore column storage cabinet units - FAQ
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How do the terms nano capillary and micro LC differ in terms of column ID and typical flow rates - FAQ
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How does efficiency in Aqueous Normal Phase ANP compare to HILIC in HPLC - FAQ
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How does the shorter column supplied in the HSQ kit affect the data compared to the longer column from the PQ Kit - FAQ
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How frits are manufactured - INTERNAL ONLY
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How many injections should I expect on the HSQ Kit HPLC column - FAQ
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How often do I need to clean or wash a Cogent TYPE-C column to keep data precise - FAQ
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How often do I need to do the conditioning procedure for a new Diamond Hydride column - FAQ
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How to back flush and wash an HPLC column for reuse - Tips & Suggestions
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How to condition Cogent RP or HPS or Axis HPLC columns for storage - Tips & Suggestions
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How to get improved retention and peak shape for glutamine glutamic acid and aspartic acid - Tips & Suggestions
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How to keep HPLC columns free of adsorbed contaminants - How To
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How to minimize HPLC column blockage from most common causes - Tips & Suggestions
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HPLC Retention time shift troubleshooting - Tips & Suggestions
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HPLC stationary phase can be responsible for a blocked frit- Tips & Suggestions
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I heard that there is not a good alternative to HILIC to achieve sufficient retention for some compounds - FAQ
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I see a strange saw tooth type of pattern in the UV baseline using my Cogent HPLC column what is it and how can I fix it - FAQ
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Improvement in signal to noise in LCMS with an ANP method - Tips & Suggestions
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Is the Cogent Column Filter compatible with a 2.1mm ID column - FAQ
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Know the void volume of an HPLC column - Tips & Suggestions
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Method development tip for maleic hydrazide - Tips & Suggestions
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Mobile Phase recommendation Cogent Diamond Hydride columns for use with serum samples in Aqueous Normal Phase LCMS - Tips & Suggestions
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My LCMS source was getting white film on it and at the same time the background noise was very low so is my Diamond Hydride column bleeding packing material - FAQ
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Negative Baselines in HPLC at 214nm - Tips & Suggestions
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NMR structure confirmation data for Cogent Bidentate C18 phases - Tech Information
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NMR structure confirmation data for Cogent UDC-cholesterol phases - Tech Information
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PEEK column hardware end fitting dimensions - INTERNAL ONLY
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PEEK slurry reservoir 2.1mm ID column packing hardware information - FAQ
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Percentage of acid needed in Aqueous Normal Phase ANP methods - Tips & Suggestions
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Policy on verifying a new Cogent HPLC column performance - Tips & Suggestions
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Protecting HPLC analytical columns and when to use guard columns vs Cogent Column Filters - Tips & Suggestions
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Purge metals from HPLC system using EDTA or medronic acid - How To
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Random shifting of retention times in HPLC chromatograms - Tips & Suggestions
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Reasons for using direct adaptive Di-Ad HPLC column connectors - Tips & Suggestions
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Retention and or peak shape for citric acid has changed compared to data from a previous HPLC run - Tips & Suggestions
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Ribose and Xylose analysis without forming Schiff bases - AppNote
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Sample concentration changes can effect retention time in HPLC - Primer
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Should I filter my HPLC solvents and buffers before use - FAQ
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Should I use a 1 piece fitting or a 2 piece fitting for HPLC - FAQ
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Since Cogent TYPE-C columns can be used in Reversed Phase or Normal Phase what do you suggest to switch these solvent systems which are not miscible - FAQ
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Since Cogent TYPE-C Silica columns use a transition metal catalyst in production what is the presence of any trace quantity on the surface of the stationary phase- FAQ
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Solvents and solutions that should be avoided when using PEEK filters fittings or tubing - Tech Information
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Solving baseline problems in Aqueous Normal Phase ANP methods - Tips & Suggestions
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The common names of HPLC column diameters - Primer
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The effect of ionic strength of the mobile phase additive for HPLC columns in Aqueous Normal Phase - Tips & Suggestions
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Theoretical plate estimates indicates column condition - Primer
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Using an Aqueous Normal Phase ANP method will sodium ions interfere with succinate when analyzing sodium succinate - FAQ
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Using Aqueous Normal Phase ANP to your advantage - White Paper
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Using temperature changes for separations of terpenoids with the Cogent Bidentate C18 and UDC-Cholesterol HPLC columns - Tips & Suggestions
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What are some notable examples of journal articles that feature Aqueous Normal Phase ANP methods in metabolomics studies - FAQ
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What are the dimensions of 4.6mm ID 5um frits for columns made with PEEK - FAQ
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What are the main differences between Cogent Amide columns and other brands of Amide - FAQ
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What are the thread specifications for the PEEK columns - FAQ
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What are the typical flow rates recommended by HPLC column companies to start with for various column ID - Primer
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What are the uses of PEEK HPLC column hardware - FAQ
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What are theoretical plates and HETP in HPLC - Primer
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What column changes are permitted in USP HPLC methods - FAQ
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What does stainless in stainless steel mean - FAQ
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What does the term 10-32 mean to a chromatographer working with HPLC vials - FAQ
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What is a direct silicon to carbon bond regarding Cogent HPLC columns - FAQ
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What is a master batch for Cogent HPLC columns - FAQ
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What is the cause of a pressure increase after injections of blanks in HPLC - FAQ
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What is the chemical structure of the ligand in the Cogent DIOL HPLC stationary phase - FAQ
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What is the compatibility of Cogent TYPE-C Silica HPLC columns with UHPLC instruments - FAQ
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What is the definition of a fitting for HPLC - FAQ
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What is the definition of passivating and purging in HPLC - FAQ
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What is the difference between a 4um and a 5um particle in a C18 column - FAQ
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What is the difference between a Waters type fitting and a standard 10-32 fitting - FAQ
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What is the difference between ferrules made of stainless steel vs stainless steel and PEEK hybrids - FAQ
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What is the difference between the ColumnStore 120 and four ColumnStore 30 - FAQ
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What is the difference between weak and strong cation exchange for Ion Exchange columns - FAQ
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What is the largest Internal Diameter for Cogent TYPE-C prep columns - FAQ
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What is the maximum pressure Cogent HPLC columns can tolerate - FAQ
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What is the maximum pressure of the 2.1mm PEEK HPLC columns - FAQ
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What is the maximum pressure of your guard columns - FAQ
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What is the maximum pressure rating for Cogent HPLC columns? - FAQ
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What is the maximum pressure the Cogent Column Filters should be used with - FAQ
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What is the maximum temperature for Cogent Diamond Hydride HPLC columns - FAQ
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What is the pH range of 316 stainless steel laboratory tubing fittings and sparging stones - FAQ
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What is the pilot length or dimension X depth for end fittings uses to connect HPLC columns - FAQ
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What is the pressure rating of the Hichrom brand column coupler - FAQ
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What is the purpose of back flushing an HPLC column and will it damage it - FAQ
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What is the purpose of using isopropanol IPA as part of the mobile phase solvent in ANP methods - FAQ
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What is the thickness of the SS filter element in the Cogent Column Filters - FAQ
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What is the useful temperature range of 316 stainless steel laboratory products - FAQ
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What is the useful temperature range of PEEK laboratory products - FAQ
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What is the volume of Cogent HPLC columns - FAQ
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What materials are the Cogent Column Filters manufactured with - FAQ
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What results when I use a small guard column with a larger ID or prep column - FAQ
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What type of fitting is best to use with the Cogent HPLC and LCMS columns - FAQ
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What type of tubing do I use to connect the guard column holder to analytical columns - FAQ
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When is the acid group of the Cogent UDA HPLC column ionized - Tech Information
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Which columns are compatible with the Hichrom brand column coupler Cat No 47450-06 - FAQ
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Which ferrules are best when using soft polymeric tubing - FAQ
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Which HPLC column do you suggest for analysis of carotene or lycopene - FAQ
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Which HPLC column ID dimensions are the Hichrom brand guard column holders cat no 82000-GH compatible with - FAQ
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Which HPLC column internal diameter should I use for LCMS - FAQ
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Which size guard column should I use with my 1mm Cogent 2.o column - FAQ
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Which solvents should not be used with the Cogent Column Filters - FAQ
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Why am I seeing two peaks for quaternium15 Dowicil-75 in LCMS - FAQ
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Why am I seeing two peaks for quaternium-15 or Dowicil-75 in my LCMS data - FAQ
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Why do I see large intermittent pressure spikes in HPLC runs and can it be a defective column - FAQ
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Why you should use temperature control with the UDC-Cholesterol column - Tips & Suggestions
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Will a different guard column hardware system different from the Cogent system affect my results when using a Cogent column - FAQ
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Will different guard columns packed by different column packers be equivalent - INTERNAL ONLY
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Will using the Cogent Column Filters change my current HPLC results - FAQ
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