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WHAT IS WRONG WITH LASER DIFFRACTION

WHAT IS WRONG with LASER DIFFRACTION ? A Critical Review of Current LASER DIFFRACTION Methods for Particle Size Analysis Richard N. Kelly1 and Frank M. Etzler2. 1. Johnson & Johnson PRD, Spring House, Pennsylvania 2. Boehringer-Ingelheim Pharmaceuticals, Danbury, Connecticut A particle-sizing method based on LASER DIFFRACTION suffers from several major pitfalls, namely: (1) the method is based on false assumptions (2) the reported distribution can be skewed towards the smaller range (3) the results vary significantly with optical parameters (4) the software used for calculation of results can not be independently validated (5) the accuracy of measurements for non-spherical particles is unacceptable Consequently, the results of particle-sizing analysis based on LASER DIFFRACTION methods should not be trusted.

1 WHAT IS WRONG WITH LASER DIFFRACTION? A Critical Review of Current Laser Diffraction Methods for Particle Size Analysis Richard N. Kelly1 and Frank M. Etzler2 1 Johnson & Johnson PRD, Spring House, Pennsylvania 2 Boehringer-Ingelheim Pharmaceuticals, Danbury, Connecticut A particle-sizing method based on laser diffraction suffers from several major pitfalls, namely:

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