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The biosynthesis of gallic acid in a number of higher plants was investigated by using l-[U-(14)C]phenylalanine, (-)-[G-(14)C]shikimic acid, d-[1-(14)C]glucose and d-[6-(14)C]glucose as tracers. The results are compared with those obtained similarly for caffeic acid and are interpreted in terms of the dehydrogenation of 5-dehydroshikimic acid as a normal route of metabolism for gallic acid.
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Dewick et al. (1969) studied this question.
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