Category: Frequently Asked Questions
/
/
Sub Categories
Are septa in autosampler vial caps self sealing inert and compatible with organic solvents - FAQ
Read More
Read More
Are there any solvents that I cannot use with the knitted reactor coils KRC and knitted delay tubes KDT - FAQ
Read More
Read More
Can an autosampler needle pierce the Zone Free sealing film and will it reseal afterwards - FAQ
Read More
Read More
Can I use a PEEK finger tight fitting on stainless steel tubing - Can I use a SS fitting on PEEK tubing in HPLC - FAQ
Read More
Read More
Can the following tube diameters and materials be cut using the Stainless Steel tubing cutter? -FAQ
Read More
Read More
Can the U-2D Micro-Sample management system be used in SPE manifold for 96-well plates - FAQ
Read More
Read More
Could your PEEK tubing have contaminants via manufacturing processes from previous extrusion runs - FAQ
Read More
Read More
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
Read More
Read More
Do the MICROSOLV mobile phase delivery bottle caps have holes to insert tubing through - FAQ
Read More
Read More
For the separation of polar intermediates in reversed phase HPLC which C18 column do you recommend - FAQ
Read More
Read More
Ghost peaks appearing in results using a gradient with TFA which can degrade with time - Tips & Suggestions
Read More
Read More
How can I improve accuracy and precision when separating polar compounds by HPLC using Aqueous Normal Phase ANP - FAQ
Read More
Read More
How long will it take for chloroform to degrade the plastic safety coating on the mobile phase bottles if the bottle is broken during a fall - FAQ
Read More
Read More
How often do I need to do the conditioning procedure for a new Diamond Hydride column - FAQ
Read More
Read More
I heard that there is not a good alternative to HILIC to achieve sufficient retention for some compounds - FAQ
Read More
Read More
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
Read More
Read More
If an analyte is only soluble at basic pH can you use a basic mobile phase for my method - FAQ
Read More
Read More
My retention times are changing after storing my buffer and what could be causing this and tips to help avoid issues - FAQ
Read More
Read More
Should I use methanol as the organic solvent in HPLC when using Aqueous Normal Phase ANP - FAQ
Read More
Read More
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
Read More
Read More
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
Read More
Read More
The effect of ionic strength of the mobile phase additive for HPLC columns in Aqueous Normal Phase - Tips & Suggestions
Read More
Read More
To obtain greater sensitivity than Na adducts for sugars could you add ammonia NH4 instead - FAQ
Read More
Read More
Type of gradient to use for analysis of hydrophilic and hydrophobic molecules in the same HPLC or LCMS run - Tips & Suggestions
Read More
Read More
Using methanol instead of acetonitrile in an HPLC method should be done with caution - Tips & Suggestions
Read More
Read More
What are some of the advantages of using Cogent TYPE-C prep and semi-prep HPLC columns - FAQ
Read More
Read More
What are the temperature specifications of the autosampler vial storage box and cap for 4ml vials - FAQ
Read More
Read More
What are the typical flow rates recommended by HPLC column companies to start with for various column ID - Primer
Read More
Read More
What is the chemical compatibility of the Chemical Resistant Sealing Mats for U-2D Micro-Sample Management System - FAQ
Read More
Read More
What is the chemical structure of the ligand in the Cogent DIOL HPLC stationary phase - FAQ
Read More
Read More
What is the compatibility of Cogent TYPE-C Silica HPLC columns with UHPLC instruments - FAQ
Read More
Read More
What is the difference between precision point and conical point autosampler vial inserts - FAQ
Read More
Read More
What is the difference between the Beta Tools and other similar pliers on the market - FAQ
Read More
Read More
What is the durability of the SOLVFIL when used with standard mobile phases and buffered mobile phases - FAQ
Read More
Read More
What is the maximum concentration of ammonium fluoride to use in a mobile phase to avoid column damage - Tips & Suggestions
Read More
Read More
What is the maximum loading capacity mass injection volume that can be used for a semi prep Cogent TYPE-C HPLC column - FAQ
Read More
Read More
What is the maximum recommended operating temperature for the ARE All PEEK HPLC hardware - FAQ
Read More
Read More
What is the maximum salt concentration to use with Cogent TYPE-C HPLC columns with HPLC or LCMS - FAQ
Read More
Read More
What is the purpose of using isopropanol IPA as part of the mobile phase solvent in ANP methods - FAQ
Read More
Read More
What is the recommended sparging stone pore size to use for carbonating applications - FAQ
Read More
Read More
What makes non-coated Mobile Phase Reservoir Bottles suitable for use in various temperature environments - FAQ
Read More
Read More
What problems can occur when using a dedicated Reversed Phase HPLC instrument for an Aqueous Normal Phase ANP method for the first time - FAQ
Read More
Read More
What type of tubing do I use to connect the guard column holder to analytical columns - FAQ
Read More
Read More
What will the pressure be with a mobile phase of 90% methanol and 10% DI water with a 4.6 x 250mm Cogent TYPE-C HPLC column - FAQ
Read More
Read More
When I run gradients on my HPLC and switch from one gradient to another my baseline shows as negative and if I auto zero it becomes positive for the remainder of the run but when I start again it is negative - Primer
Read More
Read More
Which column coupler do you recommend for pairing HPLC columns with guard columns- Tech Information
Read More
Read More
Which HPLC column ID dimensions are the Hichrom brand guard column holders cat no 82000-GH compatible with - FAQ
Read More
Read More
Why am I observing broad split peaks in Aqueous Normal Phase ANP when using acetonitrile and methanol diluents - FAQ
Read More
Read More
Why are ionized polar compounds generally better retained in Aqueous Normal Phase ANP HPLC - FAQ
Read More
Read More
Why are pipettors not recommended for dispensing non aqueous liquids accurately and precisely - FAQ
Read More
Read More
Why do I see large intermittent pressure spikes in HPLC runs and can it be a defective column - FAQ
Read More
Read More
Why is it not recommended to use FEP tubing above 80°C when the melting point is much higher - FAQ
Read More
Read More