By G. Billek
Read or Download Biosynthesis of Aromatic Compounds: Proceedings of the 2nd Meeting of the Federation of European Biochemical Societies, Vienna, 21-24 April 1965 (Volume 3) PDF
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Extra info for Biosynthesis of Aromatic Compounds: Proceedings of the 2nd Meeting of the Federation of European Biochemical Societies, Vienna, 21-24 April 1965 (Volume 3)
97, 1 9 1 0 . G R I S E B A C H , H . ( 1 9 6 2 ) Planta Medica 10, 3 8 5 . G R I S E B A C H , H . ( 1 9 6 5 ) In Biochemistry of Plant Pigments Academic Press, New York. G R I S E B A C H , H . , and B A R Z , W . ( 1 9 6 4 ) Z . Naturf (T. G R I S E B A C H , H . , and B R A N D N E R , G . ( 1 9 6 2 ) Experientia H . ), p. 233, 19b, 5 6 9 . G R I S E B A C H , H . , and B R A N D N E R , G . ( 1 9 6 1 ) Z . Naturforsch. GRISEBACH, W. 16b, 2 . [Basel] 18, 4 0 0 . K . Unpublished results. G R I S E B A C H , H .
Coumaric acid to caffeic acid is a well-known reaction one may assume that the biosynthesis of piceatannol follows the scheme which is shown in Fig. 7. T A B L E 2. PRECURSORS OF PICEATANNOL Compound Sodium acetate-l-^*C /7-Coumaric acid-2-^*C Caffeic acid-2-**C Activity (mc) Incorporation (%) 400 0-35 0-32 006 001 0 02 It must be mentioned that in these experiments we used cinnamic acids labelled in position 2 of the side chain. According to Seshadri (1957) plant stilbenes should originate by condensation of aldehydes with phenylacetic acids (Fig.
I4C] (I) is incorporated into catechines in tea leaves with no randomization of activity (Patschke and Grisebach, 1965) (Fig. 4). In Cicer arietinum the chalcone I is incorporated only into an isoflavone with phloroglucinol-type substitution in ring A (biochanin A) and the 4,4',6'-trihydroxychalcone-4'-glucoside-[jS-i4C] (II) can serve only as a precursor for an isoflavone with a resorcinol-type ring A (formononetin). These results are consistent only with an intact incorporation of the chalcones.