In my firm, we send PET tests to a microbiologists. We do microbial quality testing in-house on batch ourselves. However, I want to become more aware of the process that goes into microbiology and testing of cosmetic products. I decided to look into some standards like the ISO 11930, this gave me a lot of useful information. UPS <61> did not really explain things like ISO standards does.
My question to you guys is:
When using microbial strains to make the preparation of test-microorganisms to inoculate, do you make it by growing your own strains and diluting it to a certain cfu/ml? Or is it possible to get your hands on finished standardised strains with a larger cfu/ml? It seems to me that the preparation of test-microorganisms takes up so much time. Is there a simpler way?