March 27th 2025
In the latest of a series of warning letters to India-based API manufacturers, FDA issued a warning letter to Aspen for deviations in CGMP in the production of APIs.
February 25th 2025
Purification of Peptides Using Surrogate Stationary Phases on Reversed-Phase Columns
August 2nd 2016This paper describes a unique Prep-rP-HPLC technique that uses a C-18/C-8 derivatized silica coated with a hydrophobic quaternary ammonium salt or quaternary phosphonium salt that acts as an additional/surrogate stationary phase (AsP/ssP).