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Caffeine and trigonelline are major nitrogenous alkaloids found in coffee seeds. Accumulation of these alkaloids in two cultivars of Coffea arabica and in a cultivar of Coffea canephora seeds was monitored. Growth stages are specified by letters, A to G. They correspond to the pinhead and small (A), rapid expansion and pericarp growth (B), endosperm formation (C), early dry matter accumulation (D),...
Endogenous levels of purine and pyridine alkaloids were studied in different parts of 6-month-old Coffea arabica seedlings. In seedlings, caffeine was distributed mainly in leaves and cotyledons at concentrations varying from 43 to 104μmolg -1 dry weight. Essentially no caffeine was detected in roots or in older brown parts of shoots. In contrast, trigonelline was present in all parts...
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