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Potassium sorbate (E202) is a synthetic food preservative commonly used to extend the shelf life of various food products.

It works by inhibiting the growth of molds, yeast, and some bacteria, preventing spoilage. When added to foods, it helps maintain their freshness and quality.

Some studies have shown that when combined with nitrites, potassium sorbate have genotoxic activity in vitro. However, potassium sorbate is generally recognized as safe (GRAS) by regulatory authorities.

Cysteine (symbol Cys or C; ) is a semi-essential proteinogenic amino acid with the formula HO2CCH(NH2)CH2SH. The thiol side chain in cysteine often participates in enzymatic reactions, as a nucleophile. The thiol is susceptible to oxidation to give the disulfide derivative cystine, which serves an important structural role in many proteins. When used as a food additive, it has the E number E920. It is encoded by the codons UGU and UGC. Cysteine has the same structure as serine, but with one of its oxygen atoms replaced by sulfur; replacing it with selenium gives selenocysteine. (Like other natural proteinogenic amino acids cysteine has (L) chirality in the older D/L notation based on homology to D and L glyceraldehyde. In the newer R/S system of designating chirality, based on the atomic numbers of atoms near the asymmetric carbon, cysteine (and selenocysteine) have R chirality, because of the presence of sulfur (resp. selenium) as a second neighbor to the asymmetric carbon. The remaining chiral amino acids, having lighter atoms in that position, have S chirality.)