The Rapid Micro Blog

Our blog will keep you informed of new and noteworthy technologies, reviews of recent publications and presentations, upcoming conferences and training events, and what's changing in the rapid and alternative microbiological methods world.

A new RMM sterility test publication in this month's PDA Journal

Alcon has published their second paper on using a RMM for sterility testing. This time they focus on how to compare the limit of detection between the RMM and the pharmacopoeial method. The reference and abstract are below:

2010. Ron Smith, Mark von Tress, Cheyenne Tubb and Erwin Vanhaecke. Evaluation of the ScanRDI as a Rapid Alternative to the Pharmacopoeial Sterility Test Method: Comparison of the Limits of Detection. PDA J Pharm Sci Technol. 64: 211-221.

Two sterility test methods, the ScanRDI_ rapid sterility test and the United States Pharmacopeia/European Pharmacopoeia/Japanese Pharmacopoeia (USP/EP/JP) compendial sterility test, were compared with respect to the limits of detection for the presence of viable microorganisms in aqueous solutions at low inoculation levels. The ScanRDI_ system employs a combination of direct fluorescent labeling techniques and solid-phase laser scanning cytometry to rapidly enumerate viable microorganisms from aqueous samples, whereas the compendial sterility test is a qualitative, growth-based method that uses a visual assessment of turbidity to indicate microbial contamination. Eight microorganisms were evaluated, seven compendial microorganisms (Clostridium sporogenes, Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Bacillus subtilis, Aspergillus niger, Candida albicans) and the Gram-positive anaerobe Propionibacterium acnes. The number of viable organisms was estimated using the ScanRDI_ method and the conventional sterility test method using most probable number methodology. The mean difference between the methods was computed and 95% confidence intervals around the mean difference were estimated. The ScanRDI_ method was found to be numerically superior and statistically non-inferior to the compendial (USP/EP/JP) sterility test with respect to the limits of detection for all organisms tested.


  1. i would like to know the difference in cost of two methods and time taken

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