A new book, Analysis of Drug Impurities, helps analytical chemists understand the challenges and techniques related to the accurate identification and measurement of impurities in drug products. Eight of the book's chapters were contributed by experts from Big Pharma and the US Food and Drug Administration.
The first two chapters provide solid introductions to the origin, control, and measurement of impurities in drug substances and products.
Chapter 6 discusses chromatography and on-line structure elucidation using spectroscopy. Its section about LC–mass spectrometry (MS), LC–nuclear magnetic resonance (NMR), and other related techniques is easy to understand, provides helpful examples, and describes many practical issues.
An interesting map in Chapter 7 provides instructions for the preparative isolation of impurities. Impressive flow diagrams present information about impurity isolation, identification, work flow, method development scouting, and task performance. The diagrams help the reader put various tasks and operations in perspective.
The book would have benefited from a full chapter each about the regulatory issues involved in the treatment of impurities and one about simple techniques such as HPLC. Overall, Analysis of Drug Impurities is a strongly recommended reference for any laboratory that handles impurities.
Sanjay Garg is an associate professor and deputy head of the School of Pharmacy at the University of Auckland, New Zealand, and a member of Pharmaceutical Technology's Editorial Advisory Board, tel. 164 9 373 7599 ext. 82836, [email protected]