1985
DOI: 10.1080/00021369.1985.10866711
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Conversion of Xanthosine into Caffeine in Tea Plants

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Cited by 8 publications
(12 citation statements)
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“…Additional evidence that theobromine is an immediate precursor of caffeine was provided by studies using tea leaves: (a) radiolabeled adenine (Ashihara and Kubota, 1986;Fujimori and Ashihara, 1990;Fujimori et al, 1991), guanine, and hypoxanthine Takahashi, 1976a, 1976b;Ashihara and Kubota, 1987) were incorporated into theobromine and caffeine to a greater extent than into theophylline by intact leaves; (b) during leaf development, theobromine content decreased as the concentration of caffeine increased (Ashihara and Kubota, 1986); and (c) cell-free extracts of tea leaves converted 7-methylxanthosine and 7-methylxanthine to both theobromine and caffeine (Suzuki and Takahashi, 1975a;Negishi et al, 1985aNegishi et al, , 1985bFujimori et al, 1991).…”
mentioning
confidence: 99%
“…Additional evidence that theobromine is an immediate precursor of caffeine was provided by studies using tea leaves: (a) radiolabeled adenine (Ashihara and Kubota, 1986;Fujimori and Ashihara, 1990;Fujimori et al, 1991), guanine, and hypoxanthine Takahashi, 1976a, 1976b;Ashihara and Kubota, 1987) were incorporated into theobromine and caffeine to a greater extent than into theophylline by intact leaves; (b) during leaf development, theobromine content decreased as the concentration of caffeine increased (Ashihara and Kubota, 1986); and (c) cell-free extracts of tea leaves converted 7-methylxanthosine and 7-methylxanthine to both theobromine and caffeine (Suzuki and Takahashi, 1975a;Negishi et al, 1985aNegishi et al, , 1985bFujimori et al, 1991).…”
mentioning
confidence: 99%
“…These results indicate that xanthosine is a precursor of caffeine in coffee plants as well as in tea plants. 4 ) In addition,~considerable amount of radioactivity was also detected in allantoin, the level of which at each incubation period was similar to that of 7-methylxanthine in Fig. 1, suggesting that part of the xanthosine is degraded to allantoin via xanthine by the catabolic pathway.…”
Section: Received January 7 1985mentioning
confidence: 73%
“…Recently we described the conversion of xanthosine into caffeine in tea plants. 4 ) In addition, Nmethyltransferase, which catalyzes the methylation of 'xanthosine to 7-methylxanthosine, could be extracted from tea leaves. 5 ) From these results, we confirmed that the methylation of xanthosine to 7-methylxanthosine is the first step of a series of methylations in the pathway for caffeine biosynthesis.…”
Section: Received January 7 1985mentioning
confidence: 99%
“…Up to 26% if the tracer was converted into caffeine within 8 days. When radiolabelled xanthosine was fed to young coffee shoots (Negishi et al, 1985a) the radioactivity of the xanthosine decreased rapidly with the first 10 hr after the uptake and the radioactivity of caffeine increased continuously during the incubation period. The level of 7methylxanthine and theobromine increased during the first 3 hr and 10 hr respectively and then decreased.…”
Section: Modern Biotechnological Approaches For Development Of Low/nimentioning
confidence: 99%