Stereoisomerization ofp-coumaric and ferulic acids during their incubation in peat soil extract solution by exposure to fluorescent light

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Abstract
We studied two unknown substances which were produced by incubation of p-coumaric and ferulic acids in a peat soil extract solution. The substances were identified as the cisforms of these acids, which were isomerized from their trans-forms during the incubation by exposure to fluorescent light. Such isomerization did not take place during incubation under dark conditions. After 5 days of incubation by exposure to fluorescent light, the maximal ratio of cis-form to trans-form p-coumaric and ferulic acids was 0.61 and 0.45, respectively.