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Rapport

by Baumann, T.W; Wanner, H; Association Scientifique Internationale du Café, París (Francia); 8. Colloque Scientifique International sur le Café Abidjan (Costa de Marfil) 28 Nov-3 Dic 1977.
Publisher: París (Francia) 1979Description: p. 135-137.Other Title: Tracer studies on Biosynthesis of caffeine in Coffea arabica.Subject(s): COFFEA ARABICA | BIOSINTESIS | CAFEINA | HOJAS | COFFEA ARABICA | BIOSYNTHESIS | CAFFEINE | LEAVES | COFFEA ARABICA | BIOSYNTHESE | CAFEINE | FEUILLESummary: In an earlier work (Looser et. al., Phytochem., 13 (1974), 2515-2518), in which we fed potential precursors of caffeine together with L-methionine (methyl-14C) to leaf disks, we were able to determine the individual intermediates of a likely pathway of caffeine biosynthesis as far back as the nucleoside 7-methylxanthosine. We have now synthesized labelled 7-methylxanthosine (methyl-and ring-14C-lavelled) and have studied the 14C-incorporation into caffeine after feeding this tracer. The results confirm the proposed pathway from 7-methylxanthosine via 7-methylxanthine and theobromine to caffeine
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Dat. num. 5 ref. Sum. (En, Fr)

In an earlier work (Looser et. al., Phytochem., 13 (1974), 2515-2518), in which we fed potential precursors of caffeine together with L-methionine (methyl-14C) to leaf disks, we were able to determine the individual intermediates of a likely pathway of caffeine biosynthesis as far back as the nucleoside 7-methylxanthosine. We have now synthesized labelled 7-methylxanthosine (methyl-and ring-14C-lavelled) and have studied the 14C-incorporation into caffeine after feeding this tracer. The results confirm the proposed pathway from 7-methylxanthosine via 7-methylxanthine and theobromine to caffeine

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