• free nicotine - 引用次数：6

  When topping at the right(neither too early not too late) time the contents of nicotine,nornicotine and nitrite decreased. When late topping the contents of totall nicotine,free nicotine in upper leaves obviousty,increased.

  结果表明,早打顶的烤烟上、中、下部叶的降烟碱、硝酸盐、亚硝酸盐含量最高;中(适时)打顶时,它们的含量都降低,但中打顶使上部叶的游离烟碱含量升高,中部叶游离烟碱降低;晚打顶时,上部叶总烟碱、游离烟碱含量增加。

  参考来源 - 打顶时间对烤烟特有亚硝胺前体物的影响

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