Challenge tests, microbial limits, and preservative efficacy (PET) — media, incubators, and methodology for cosmetic QC labs.
Microbial Limits in Cosmetics
Water-based creams, shampoos, and serums must pass microbial limit tests — especially for gram-negative pathogens and yeast contamination common in warm climates.
Testing Supplies
- Media: TSA, SDA, R2A for total counts; selective for P. aeruginosa, Candida
- PET protocol: Inoculation suspensions, recovery media, neutralizers
- Incubator 30–35°C, 20–25°C for moulds
- Sterile sampling: Stomacher for raw materials, contact plates for surfaces
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