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烟碱是积累在烤烟叶片中的主要生物碱,它与烟叶品质和产品的可接受性有首要的联系。在鲜烟叶中,也仍然含有下列属于附加的次要生物碱:降烟碱、假木贼碱、麦斯明和少数较小量的生物碱,次要生物碱一般只占总生物碱的2—5%。烟碱是一种有毒的生物碱,曾经在一个时期广泛地用作农业杀虫剂。在烟株上,烟碱曾一度被认为在防治害虫和有害动物上作为一种防护机理起到有限的作用。最近它被认为是烟叶中一种副的代谢产品,它的积累没有任何可解释的目的。
Nicotine is the major alkaloid that accumulates in flue-cured tobacco leaves and has the highest correlation with tobacco leaf quality and product acceptability. In fresh tobacco, the following additional secondary alkaloids are still present: nornicotine, pseudospermsine, maxmine, and a few minor alkaloids, with minor alkaloids generally accounting for only 2- 5%. Nicotine is a toxic alkaloid that has been used extensively as an agricultural pesticide over a period of time. Nicotine was once thought to play a limited role as a protective mechanism against pests and pests in tobacco plants. It has recently been considered as a secondary metabolite in tobacco leaves and its accumulation has no explanatory purpose.