Lactobacillus and bifidobacterium, present in yogurt and other dairy products, are well-known medical foods used as probiotics, or “friendly bacteria”, to maintain a healthy digestive tract. Flow cytometry, a cell-counting method for assessing the quality of cultures by determining the proportion of active cells, has met with a degree of skepticism. Now, a new ISO standard rubber-stamps the validity of this method, speeding up quality control and facilitating trade.
A recently published International Standard, ISO 19344 (IDF 232), provides a method for the quantification of lactic acid bacteria by flow cytometry in fermented products, starter cultures and probiotics used in dairy products. This publication is the result of the joint work of ISO and theInternational Dairy Federation (IDF).