Cosmetic product testing includes:
Assay determination by gas chromatography (GC) and high performance liquid chromatography (HPLC) methods, for example:
- testing for vitamins content, preservatives, dyes (HPLC)
- testing for essential oils indentification and assay (GC)
according to developed and validated methods in the laboratory, and also according to existing ISO, for example:
ISO 11024-1: 1998 Essential oils — General guidance on chromatographic profiles — Part 1: Preparation of chromatographic profiles for presentation in standards
ISO 11024-2:1998 Essential oils — General guidance on chromatographic profiles — Part 2: Utilization of chromatographic profiles of samples of essential oils