Oxidative dimerization of ferulic acid by extracts from Sorghum |
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Authors: | Helen A. Stafford Mark A. Brown |
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Affiliation: | Biology Department, Reed College, Portland, OR 97202, U.S.A. |
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Abstract: | Extracts from leaves and first internodes of Sorghum bicolor catalyze the conversion of ferulic acid to a β-β-coupled dimer, the dilactone dimer of ferulic acid. The dilactone is then hydrolyzed, probably non-enzymatically, to a blue fluorescing compound, tentatively identified as a β-β-coupled dimer with at least one lactone ring opened to form a carboxylic acid. Both the initial enzymatic and the subsequent non-enzymatic steps are greater at pH 8 than pH 6. The most active preparation is a crude particulate fraction from leaves obtained by centrifugation at 37000 g; white light increases the amount of dimer formed. |
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Keywords: | Gramineae ferulic acid oxidative phenol coupling ferulic-β-β-dimerase dilactone of ferulic acid. |
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