Why are ionized polar compounds generally better retained in Aqueous Normal Phase ANP HPLC – FAQ Read More →
Are there HPLC columns that could be used to separate both polar and nonpolar compounds in a single run – FAQ Read More →
Two gradients to use for analysis of hydrophilic and or hydrophobic molecules in the same Aqueous Normal Phase ANP method – Tips & Suggestions Read More →
How to keep the Cogent Diamond Hydride column clean when using blood as a sample – Tips & Suggestions Read More →
How can I improve accuracy and precision when separating polar compounds with HPLC using Aqueous Normal Phase ANP – FAQ 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 →
How to get improved retention and peak shape for glutamine glutamic acid and aspartic acid – Tips & Suggestions Read More →
Determining Efficiency of HPLC methods comparing 4um v 2.o HPLC columns – Tips & Suggestions Read More →
What is the difference between weak and strong cation exchange for Ion Exchange columns – FAQ Read More →
How can I fix poor peak shape for phosphorylated compounds in aqueous normal phase ANP methods – FAQ Read More →
What is the compatibility of Cogent TYPE-C Silica HPLC columns with UHPLC instruments – FAQ Read More →
How does ammonium fluoride affect HPLC and LCMS data if using Aqueous Normal Phase ANP methods – FAQ 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 →
Which acid or base additive should I choose for positive or negative ion mode in LC-MS – FAQ Read More →
Should I use methanol as the organic solvent in HPLC when using Aqueous Normal Phase ANP – FAQ Read More →
Blocked HPLC column from proteins from the sample matrix can be recovered – Tips & Suggestions Read More →
Using ammonium acetate or formate in an acetonitrile based HPLC mobile phase for Aqueous Normal Phase ANP – Tips & Suggestions Read More →
LFER studies compared to Log D data in describing the Aqueous Normal Phase ANP retention – Tips & Suggestions Read More →
Using the wavelength calibration solution holmium oxide for HPLC UV detector performance qualification – Tips & Suggestions Read More →