Overview
ISO/TR 14735:2013 - "Cosmetics - Analytical methods - Nitrosamines" is a technical guidance document that helps cosmetics manufacturers, laboratories and regulators minimize the formation of N‑nitrosamines and reliably determine their presence in cosmetic raw materials and finished products. The report explains N‑nitrosamine chemistry, practical reduction strategies, available analytical methodologies (including screening and specific assays), and an overall analytical approach to support compliance and risk assessment.
Key Topics
- Scope and purpose: Guidance on strategies to reduce N‑nitrosamine formation and descriptions of analytical methods, their relevance and limitations.
- N‑nitrosamine chemistry: Formation mechanisms - nitrosation of secondary amines by nitrite or nitrogen oxides; common precursor sources in cosmetic ingredients.
- Minimization strategies:
- Reduce/eliminate adventitious nitrite - use purified water, nitrite‑free containers and minimize exposure to nitrogen oxides during manufacture.
- Avoid secondary amine sources - minimize use of dialkylamines, dialkanolamines and monitor impurities/decomposition products in intermediates.
- Use inhibitors - select nitrite scavengers or inhibitors (consider solubility and reactivity); add inhibitors prior to organonitrogen ingredients.
- Raw material treatment - possible decomposition or remediation of contaminated inputs.
- Analytical methods:
- Screening by chemiluminescent detection of nitric oxide (to detect total N‑nitroso compounds).
- Apparent Total Nitrosamine Content (ATNC) determination as a screening measure.
- Specific methods for N‑nitrosodiethanolamine (NDELA) and other targeted N‑nitrosamines - describes benefits and limits of each approach.
- Analytical approach: Recommended strategy combining screening and specific measurements, and good analytical practice to ensure valid data.
Applications and Users
- Cosmetic formulators and manufacturers - design formulations and manufacturing controls to minimize nitrosamine risk.
- Quality control and analytical laboratories - implement screening and quantitative assays (e.g., chemiluminescence, ATNC, targeted NDELA methods).
- Regulators and compliance teams - assess product safety, support regulatory submissions and verify compliance with regional restrictions.
- Raw material suppliers - monitor precursor levels and supply nitrite‑free materials.
Related Standards and References
- ISO standards referenced for methods: ISO 15819 and ISO 10130 (analytical methods).
- Regulatory context: European cosmetics directives and limits (e.g., nitrosamine limits for certain raw materials) and scientific reviews on carcinogenicity (IARC, SCCS).
Keywords: ISO/TR 14735:2013, N‑nitrosamines, cosmetics, NDELA, analytical methods, chemiluminescent detection, ATNC, nitrosamine minimization, regulatory compliance.