1. Introduction
Thioglycolic acid (TGA), thioglycolates and thiol esters have widespread applications in cosmetics, especially in hair-treatment products and depilatory creams due to their reducing character- istics. TGA can diffuse into and react with the hair keratin fibers and give rise to the disconnection of the disulfide ( SS ) groups [1,2]. However, the exposure to TGA through cosmetic products has a potential adverse effect on human health [3], especially due to its reproductive toxicity [4,5]. The Ministry of Public Health of China has set four safety levels for TGA, namely 8% for home-use hair-treatment products, 11% for professional-use hair-treatment products, 5% for depilatory creams, and 2% for rinse-off hair care products [6]. Therefore, straightforward and effective analytical methods for the accurate determination of TGA are needed for supervising purpose.
1. Introduction
Thioglycolic acid (TGA), thioglycolates and thiol esters have widespread applications in cosmetics, especially in hair-treatment products and depilatory creams due to their reducing character- istics. TGA can diffuse into and react with the hair keratin fibers and give rise to the disconnection of the disulfide ( SS ) groups [1,2]. However, the exposure to TGA through cosmetic products has a potential adverse effect on human health [3], especially due to its reproductive toxicity [4,5]. The Ministry of Public Health of China has set four safety levels for TGA, namely 8% for home-use hair-treatment products, 11% for professional-use hair-treatment products, 5% for depilatory creams, and 2% for rinse-off hair care products [6]. Therefore, straightforward and effective analytical methods for the accurate determination of TGA are needed for supervising purpose.
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