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  • Quantitative determination of dimethylaminoethanol in cosmetic formulations by nuclear magnetic resonance spectroscopy.

Quantitative determination of dimethylaminoethanol in cosmetic formulations by nuclear magnetic resonance spectroscopy.

Journal of AOAC International (2009-02-11)
Ivani Aparecida Soares de Andrade Batista, Maria Inês de Almeida Gonçalves, Anil Kumar Singh, Erika Rosa Maria Kedor Hackmann, Maria Inês Rocha Miritello Santoro
ABSTRACT

A nuclear magnetic resonance (NMR) spectroscopic method was validated for the quantitative determination of dimethylaminoethanol (DMAE) in cosmetic formulations. The linearity in the range from 0.5000 to 1.5000 g (DMAE salt/mass maleic acid) presents a correlation coefficient > 0.99 for all DMAE salts. The repeatability (intraday), expressed as relative standard deviation, ranged from 1.08 to 1.44% for samples and 1.31 to 1.88% for raw materials. The detection limit and quantitation limit were 0.0017 and 0.0051 g for DMAE, 0.0018 and 0.0054 g for DMAE bitartrate, and 0.0023 and 0.0071 g for DMAE acetamidobenzoate, respectively. The proposed method is simple, precise, and accurate and can be used in the quality control of raw materials and cosmetic gels containing these compounds as active substances.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
2-Dimethylaminoethanol, purified by redistillation, ≥99.5%
Sigma-Aldrich
2-Dimethylaminoethanol, ≥99.5%
Sigma-Aldrich
2-Dimethylaminoethanol, purum, ≥98.0% (GC)
Sigma-Aldrich
2-Dimethylaminoethanol, SAJ first grade, ≥99.0%