Category: HPLC Columns FAQ
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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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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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Can I use a silica or Silica-C guard column with an analytical column of a different phase - FAQ
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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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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 Tanaka Plots for HPLC apply to columns used with Aqueous Normal Phase ANP methods - FAQ
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Does the Hichrom brand column coupler work with the Partisil and Partisphere HPLC columns - FAQ
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Eliminating shoulder peaks in an HPLC method using Cogent RP C18 columns - Tips & Suggestions
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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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How can Cogent TYPE-C HPLC columns offer faster results compared to other type of silica based columns - 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 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 often do I need to do the conditioning procedure for a new Diamond Hydride column - FAQ
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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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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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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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Protecting HPLC analytical columns and when to use guard columns vs Cogent Column Filters - 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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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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The effect of ionic strength of the mobile phase additive for HPLC columns in Aqueous Normal Phase - Tips & Suggestions
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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 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 main differences between Cogent Amide columns and other brands of Amide - 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 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 difference between ferrules made of stainless steel vs stainless steel and PEEK hybrids - 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 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 purpose of using isopropanol IPA as part of the mobile phase solvent in ANP methods - 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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Which HPLC column ID dimensions are the Hichrom brand guard column holders cat no 82000-GH compatible with - 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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