An improved synthesis of parasorbic acid, 5‐hydroxy‐2‐hexenoic acid lactone (II), provided material to develop a procedure for its analysis as a possible contaminant in sorbic acid, 2,4‐hexadienoic acid (I). Column chromatography was used to separate parasorbic acid from sorbic acid; thin‐layer chromatography (t.l.c.) provided a means of identification and quantitative estimation. Gas chromatography‐mass spectral analysis (g.c.‐m.s.) was used for positive confirmation. No parasorbic acid up to 20 parts/million, the detectable limit, was found in several commercial food grade samples of sorbic acid.
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Stafford et al. (1972) studied this question.
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