설명(영) |
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Thio compounds may be viewed as derivatives of hydrogen sulfide, H2S, in which one or both of the hydrogen atoms have been replaced by an aliphatic or aromatic carbon atom or, occasionally, by a sulfur atom. If both hydrogen atoms are replaced, the compounds are thioethers (e.g., the amino acid, Methionine). If only one of the hydrogen atoms is replaced by a carbon atom, the resulting compound is referred to as a thiol or a mercaptan (e.g., the amino acid, Cysteine). Mild oxidation of mercaptans yields disulfides (e.g., the amino acid, Cystine).
Thio compounds, as a group, are not widely used in cosmetics in light of their malodor. Certain mercaptans (e.g., Thioglycolic Acid or its salts), are used in hair waving and hair straightening products and in depilatories. Other types of thio compounds are used as antioxidants and in a variety of antibacterial and antifungal applications. |