Effect of high shear stress on microbial viability

✍ Scribed by Hélène Lange; Patricia Taillandier; Jean-Pierre Riba

• Publisher: Wiley (John Wiley & Sons)
• Year: 2001
• Tongue: English
• Weight: 111 KB
• Volume: 76
• Category: Article
• ISSN: 0268-2575
• DOI: 10.1002/jctb.401

✦ Synopsis

Abstract

Escherichia coli and Saccharomyces cerevisiae suspensions were submitted to controlled shear stress. Above a threshold value shear stress induced a decrease in micro‐organism viability. The threshold of shear stress efficiency depended on the micro‐organisms, being between 1292 Pa and 2770 Pa for S cerevisiae, and about 1250 Pa for E coli. Above 1810 Pa, E coli cells were disrupted whereas the S cerevisiae cells remained intact. The higher the cellular concentration, the greater the rate of decrease in viability. Viability loss was influenced by the number of passages through the experimental shear stress device and by exposure time.

© 2001 Society of Chemical Industry