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[Bioavailability of pyridine compounds in seeds of Ricinus communis L. at various stages of germination].

The intermediates of metabolic cycle of pyridine compounds have been isolated in Ricinus communis seeds, at various stages of development, by reversed-phase HPLC with a linear gradient elution. NAm, NAc, QAc, NMN, des-NMN, des-NAD+, NAD+ and NADP+ were separated in less than 32 min. Pyridine compounds show typical behaviours during the considered periods (0-6th day). On the basis of the obtained results the metabolic availabilities of these vegetable tissues are discussed.