Cosmetics - Microbiology - Enumeration and detection of aerobic mesophilic bacteria (ISO 21149:2017)

This technical specification outlines a standardized method for quantifying and detecting aerobic mesophilic bacteria within cosmetic products. The procedure establishes precise protocols for sampling, culture conditions, and enumeration to ensure product safety and quality control across the industry. It focuses on the isolation and growth of bacteria under controlled temperature and atmospheric conditions typical for mesophilic organisms. By adhering to these guidelines, manufacturers and laboratories can consistently assess microbial contamination levels, thereby supporting compliance with regulatory requirements for hygienic manufacturing practices. The methodology includes detailed steps for incubation periods and counting techniques, ensuring reproducibility of results. This approach facilitates international trade by harmonizing testing procedures between different regions. It serves as a foundational reference for quality assurance teams responsible for validating the microbiological safety of personal care and cosmetic formulations. The document provides comprehensive instructions applicable to various product types, enabling uniform evaluation of bacterial presence in the final goods.