Sulfites can break down the disulfide bonds of proteins and amino acids and form thiol (R-SH) and S-sulfonate (R-SSOf) (9). Tertiary amines and SchifFs bases produced from browning reactions also react with sulfites and form amine bisulfites (3). Methionine will be oxidized and converted to methionine sulfoxide by sulfites through free-radical reaction (10).

In addition to these reactions, sulfites react with many vitamins, including B1( B12, C, and K, resulting in loss of vitamin activity (4).

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