Abstract
Antimicrobial activity against Staphylococcus aureus was detected when edible and medicinal mushroom Lentinus edodes was grown in malt extract broth. The broth was subjected to anion-exchange chromatography. A solution of the dried eluate from the anion-exchange column showed a peak in the same position as pure oxalic aid when subjected to ion-pair chromatography. Treatment of pure oxalic acid and the dried eluate with diazomethane, followed by gas chromatography and mass spectrometry, gave several peaks, but a peak at retention time 4.8 min showed all the characteristics of dimethyl oxalate. It was concluded that oxalic acid was one agent responsible for the antimicrobial effect and oxalic acid was shown to exert such an effect against several other organisms.
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