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A mixture of (?)-nicotine-[2′-3H] and (±)-nicotine-[2′-14C] was administered to Nicotiana glauca plants for 3 days, resulting in the formation of radioactive nornicotine (49·5% incorporation) and myosmine (2·05% incorporation). Negligible activity was detected in anabasine, cotinine, or 3-acetylpyridine, the last two compounds being added as carriers to the harvested plants. The radioactive nornicotine consisted of 48% (?)-nornicotine-[2′-14C,3H] and 52% (+)-nornicotine-[2′-14C]. Thus if (+)-nornicotine is formed from (?)-nicotine the transformation must involve loss of the hydrogen from C-2′. Myosmine is presumably formed from nicotine via nornicotine. However by feeding myosmine-[2′-14C] to N. glauca it was shown that the dehydrogenation is not reversible, no activity being detected in nornicotine. Nicotinic acid (0·14% incorporation) was a metabolite of myosmine-[2′-14C]. Essentially all the activity of the nicotinic acid was located on its carboxyl group, indicating that myosmine was a direct precursor. 相似文献
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Myosmine was found to be present in different organs of tobacco plant by TLC. Myosmine is a natural minor alkaloid of tobacco plant; it is not a decomposition product nor a 'smoke' alkaloid. 相似文献
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