Peaks are broad and non symmetrical in LCMS method using Reversed Phase columns – Tips & Suggestions Read More →
Protecting HPLC analytical columns and when to use guard columns vs Cogent Column Filters – Tips & Suggestions Read More →
Restoring the initial results with a method for analyzing AMP ADP ATP UDP and GPT in biological extracts – Tips & Suggestions Read More →
Retention and or peak shape for citric acid has changed compared to data from a previous HPLC run – Tips & Suggestions 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 →
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 →
Solvents and solutions that should be avoided when using PEEK filters fittings or tubing – Tech Information Read More →
Suggestion for separation of phenylephrine HCl acetaminophen and dextromethorphan – Tips & Suggestions Read More →
The effect of ionic strength of the mobile phase additive for HPLC columns in Aqueous Normal Phase – Tips & Suggestions Read More →
To obtain greater sensitivity than Na adducts for sugars could you add ammonia NH4 instead – FAQ Read More →
Troubleshooting problems with poor HPLC runs before the examining the column – Tips & Suggestions 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 →
Using a Constant Pressure Method on two Instruments Producing Different Flow Rates- Tips & Suggestions Read More →
Using ammonium acetate or triethylamine TEA with Cogent HPLC columns – Tips & Suggestions Read More →
Using an Aqueous Normal Phase ANP method will sodium ions interfere with succinate when analyzing sodium succinate – FAQ Read More →
Using methanol instead of acetonitrile in an HPLC method should be done with caution – Tips & Suggestions Read More →
Using the wavelength calibration solution holmium oxide for HPLC UV detector performance qualification – Tips & Suggestions Read More →
What are some common sources of variance during sample preparation in an analytical application – FAQ Read More →
What can cause changing retention times and a peak showing up in my blank with a Silica-C column – FAQ Read More →