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Oxidative dimerization of ferulic acid by extracts fromSorghum

Authors
Journal
Phytochemistry
0031-9422
Publisher
Elsevier
Publication Date
Volume
15
Issue
4
Identifiers
DOI: 10.1016/s0031-9422(00)88948-7
Keywords
  • Sorghum Bicolor
  • Gramineae
  • Ferulic Acid
  • Oxidative Phenol Coupling
  • Ferulic-β-β-Dimerase
  • Dilactone Of Ferulic Acid.

Abstract

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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