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由于调制环境的差异,晾烟中烟草特有亚硝胺(TSNA)的浓度每年都有所不同。在特定晾制调制环境下(特别是高湿度环境),当叶片刚开始由黄色转变为褐色时,烟叶中的高含量硝酸盐通过细菌活动可能会转化为亚硝酸盐。在随后的着色阶段,亚硝酸盐和次生生物碱可能会结合形成TSNAs(Wahlber
Due to differences in the modulation environment, the concentration of tobacco-specific nitrosamines (TSNA) in air-cured tobacco varies from year to year. In certain air conditioning environments (especially in high humidity environments), high levels of nitrates in the tobacco leaf may be converted to nitrites by bacterial activity when the leaves start to change from yellow to brown. In the subsequent coloration phase, nitrite and secondary alkaloids may combine to form TSNAs (Wahlber