Occurrence and Distribution of the Flavone Tricetin and its Methyl Derivatives as Free Aglycones

Abstract

This paper presents a review of the occurrence of tricetin and its methyl ethers, with respect to their occurrence in the free state. In addition to literature data, our tabulated survey also includes a dozen unpublished results. The review indicates that 5,7,3′,4′,5′-pentahydroxyflavone and its methyl derivatives are more widespread than was known so far. Their presence as aglycones has been proved in a good number of plant species belonging to unrelated families.