Abstract
Methionine, methionine sulphoxide and methionine sulphone in gelatin were determined simultaneously by hydrolysis with p-toluenesulph- onic acid and then HPLC using the o-phthalaldehyde method. The IAG gelatins, oxidized gelatins, heat- coagulable substances (HC) and sol fractions (SF) of some gelatins were analyzed. Almost all the gelatins examined were found to have been oxidized. The oxidation ratios of the HC and SF were higher than the gelatins from which they were derived.
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