EN ISO 21150:2015 PDF

Overview

EN ISO 21150:2015 (ISO 21150:2015) - "Cosmetics - Microbiology - Detection of Escherichia coli" - provides internationally accepted guidelines for detecting and identifying Escherichia coli in cosmetic products. Published by ISO and adopted by CEN, the standard defines a laboratory approach based on enrichment in a non‑selective liquid medium (enrichment broth) followed by isolation on a selective agar medium. It emphasizes using a microbiological risk analysis to determine when testing is applicable and allows validated alternative methods where equivalence is demonstrated.

Key topics and technical requirements

• Scope and risk-based application: Use testing according to a product-specific microbiological risk analysis. Products with low microbiological risk (e.g., low water activity, hydro‑alcoholic formulations, extreme pH) may not require routine testing (see ISO 29621).
• Principle: Enrichment of the sample in non‑selective broth, then isolation on selective agar for E. coli detection; subculturing and identification steps (including identification kits) are permitted.
• Diluents and culture media: Requirements for diluents (e.g., tryptone sodium chloride solution) and recommended culture media (enrichment broths, selective agars).
• Sample handling and procedures: Preparation of initial suspensions for water‑miscible, water‑immiscible and filterable products; incubation conditions and isolation steps.
• Neutralization and suitability testing: Procedures to neutralize antimicrobial properties of preserved products and to perform suitability tests to confirm the method works for a given product (Clause 11).
• Result reporting and interpretation: Guidance on expressing detection results and documenting the test report.
• Flexibility: Acknowledges that some products (e.g., certain water‑immiscible cosmetics) may not be fully compatible with this method and references ISO 18415 for alternative approaches. Automated or other methods can be used if validated for equivalence.
• Supporting information: Informative annexes list alternative enrichment broths and neutralizers for preservatives and rinsing liquids.

Applications

• Quality control and microbiological safety testing in cosmetic manufacturing
• Routine and investigational testing to detect possible faecal contamination indicators
• Laboratory method development and validation for cosmetic testing programs
• Regulatory compliance and supplier/product release testing when E. coli is a specified microorganism

Who should use this standard

• Cosmetic manufacturers and contract laboratories performing microbiological testing
• Quality assurance and regulatory compliance teams in personal care and cosmetic companies
• Test laboratories validating alternative or automated methods for microbial detection

Related standards

• ISO 29621 - guidance on low‑microbiological‑risk products and preservative efficacy context
• ISO 18415 - alternative methods for certain cosmetic types (e.g., water‑immiscible products)
• ISO 21148 and EN 12353 (referenced normative documents for microbiological exam procedures and organism preservation)

Keywords: EN ISO 21150:2015, ISO 21150, cosmetics microbiology, detection of Escherichia coli, enrichment broth, selective agar, microbiological risk analysis, neutralization, suitability test.