湖南烤烟主要化学成分与评吸质量的非线性关系解析

以湖南烤烟B2F、C3F和X2F等级375个样本为研究对象,运用广义可加模型较为系统地研究了烤烟主要化学成分/指标与评吸质量间的线性与非线性关系。结果表明:除部分主要化学成分/指标与烤烟评吸质量呈现较强的线性关系外,在一定含量范围内,多数主要化学成分/指标与评吸质量呈现"∩"或"∪"形抛物线关系;表征湖南烤烟评吸质量的关键化学成分/指标有糖碱比、烟碱、总氮、总糖、还原糖、氮碱比和有机钾,其适宜值分别为9、3%、2.2%、25%、22%、0.8和1.2%左右;烤烟主要化学成分/指标对香气量和刺激性的影响最大,对余味的影响最小;在钾氯比、有机钾和钾硫比这3项化学指标中,有机钾对烤烟评吸质量的总体表征效果最好,其次是钾硫比,钾氯比的总体表征效果最差。与有机钾一样,钾硫比也是1个较好的综合评价指标。

Non-linear relationship between chemical compositions and smoking quality in flue-cured tobacco in Hunan province

Relationship between chemical compositions / index and smoking quality were analyzed by applying generalized additive models using 375 samples including B2F,C3F and X2F grades of flue-cured tobacco in Hunan province Results showed that:(1) the majority others presented "∩" or "∪" shaped relationships except that a few chemical components / index showed strongly linear correlation with smoking quality,;(2) the appropriate value of the key factors which represented qualities of flue-cured tobacco in Hunan province,such as sugar to nicotine ratio,nicotine,total nitrogen,total sugar,reducing sugar,nitrogen to nicotine ratio,and organic potassium,were about 9%,3%,2.2%,25%,22%,0.8%,1.2%,respectively;(3) among the nine indexes of smoking quality,chemical compositions / index made the significant impact on concentration of aroma and irritancy,while less impact on smoke aftertaste;and(4) compared three potassium indexes,the representational abilities to smoking quality is in the following order: organic potassium 〉potassium to sulfur ratio 〉potassium to chlorine ratio.