Analytical Method Development for Determining Formaldehyde in Cream Cosmetics Using Hyphenated Gas Chromatography.

Area of Science:

• Analytical Chemistry
• Forensic Chemistry
• Cosmetic Science

Background:

• Formaldehyde is a potential human carcinogen, yet formaldehyde-releasing preservatives are common in cosmetics.
• Accurate detection of formaldehyde is crucial for regulatory compliance and consumer safety.
• Existing methods for formaldehyde determination face challenges, particularly in obtaining derivatization agents for routine analysis.

Purpose of the Study:

• To develop and validate a novel analytical method for formaldehyde determination in cosmetic products.
• To optimize the use of p-toluenesulfonic (PTS) acid as a derivatization agent for GC-MS and GC-FID analysis.
• To compare the results with the established 2,4-dinitrophenylhydrazine (DNPH) method using HPLC.

Main Methods:

• Gas chromatography-mass spectrometry (GC-MS) and gas chromatography-flame ionization detection (GC-FID) were employed.
• Optimization of p-toluenesulfonic (PTS) acid concentrations, reaction time, and temperature for derivatization.
• Comparison with high-performance liquid chromatography (HPLC) using 2,4-dinitrophenylhydrazine (DNPH).

Main Results:

• The developed PTS method using GC-MS and GC-FID demonstrated excellent precision (intraday and interday, %RSD < 3.7%) and accuracy (95.0-105.0% CI).
• The method achieved low limits of detection and quantitation for formaldehyde.
• Validated analytical parameters met the requirements for routine analysis.

Conclusions:

• A new, validated method using GC-MS and GC-FID with PTS derivatization is suitable for routine formaldehyde analysis in cosmetics.
• This method addresses the challenge of obtaining derivatization agents for regulatory agencies.
• The findings support enhanced safety monitoring of cosmetic products for formaldehyde content.