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of the anion exchange resin in tertbutyl alcohol.By paper strip chromatography as described by Stark and coworkers (9), with an authentic sample of malic acid for comparison, it was shown that the fermentation containing 30% weak acids (Table III) contained only one weak acid which had the same R¡ value as a malic acid. This finding confirmed a statement by Lemjahov (6) that fumaria acid fermentations often contain malic acid.

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