Download Plant Phenolics by J.B. HARBORNE (Eds.) PDF

By J.B. HARBORNE (Eds.)

ISBN-10: 0124610110

ISBN-13: 9780124610118

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Where known compounds are involved, comparison of such data with the literature thus provides a completely unambiguous method of identifi­ cation. In the case of this flavonol glycoside, it would be useful to complete the identification by the detection of quercetin and arabinose on acid hydrolysis, but this is barely necessary. However, when a new compound is under study, it is essential to carry out further steps (see below) in order to be certain that the structure arrived at is correct. g. the hydrolysis of a new glycoside to yield a known aglycone; (2) alkaline degradation to establish the pattern of substitution of the aromatic rings; and (3) synthesis.

For example, the procedure, supported by quantitative tracer studies described by Van Sumere et al. (1972), helped to establish the role of ferulic acid and coumarin in regulating the germination of barley seeds. g. ) should also be applied. It is already apparent that some compounds such as alkylphenols, hydroquinone, ellagic acid and gallic acid esters are feeding deterrents, defence substances or allelochemicals. Other phenols and phenolic acids have been attributed with important roles in the inhibition of the germination of seeds, of fungispores and of plant growth generally.

11, 3 0 9 - 3 2 5 . E s k i n , Ν . A . M . , H o e h n , E. a n d F r e n k e l , C . (1978). J. Agric. Fd. Chem. 26, 9 7 3 - 9 7 4 . F u l l e r , K . W . a n d G a l l o n , J . R. ) (1985). " P l a n t P r o d u c t s a n d the N e w T e c h n o l o g y " . C l a r e n d o n Press, O x f o r d . G a b o r , M . (1986). " T h e P h a r m a c o l o g y o f B e n z o p y r o n e D e r i v a t i v e s a n d R e l a t e d C o m p o u n d s " . A k a d e m i a , K i a d o , Budapest. Geiger, H . (1985).

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