LCGC North America
The authors describe a system for automated analytical temperature-rising elution fractionation that uses the built-in differential refractometer of a commercial gel-permeation chromatography instrument and a stop-flow method for sample crystallization.
Understanding FDA Recommendations for N-Nitrosamine Impurity Levels
April 17th 2025We spoke with Josh Hoerner, general manager of Purisys, which specializes in a small volume custom synthesis and specialized controlled substance manufacturing, to gain his perspective on FDA’s recommendations for acceptable intake limits for N-nitrosamine impurities.