基于近红外光谱表征品质设计烟叶配方

Design of tobacco formulation based on the quality characterization by near infrared spectroscopy

针对传统烟叶配方设计客观性不强、设计效率低的问题,提出了一种基于近红外光谱表征品质的烟叶配方设计方法:利用偏最小二乘法建立烟叶化学成分、部位、香型的近红外光谱模型,并预测烟叶品质指标;以品质指标为多维向量构建综合质量表征指数,依据“相似相替”规则,参照目标配方中的原烟等级,筛选相似的替代烟叶并组成候选烟叶集合,采用线性规划求解方法计算替代配方的构成比例。利用指标评价与感官验证相结合的方式,验证2020年度四川烟叶配方设计效果。结果表明:替代配方的烟叶部位、烟叶总糖、还原糖、总植物碱、总氮含量等与目标配方的相对误差小于6%;除刺激性指标外,替代配方烟叶香气量、清晰度、透发性、成团性、杂气、余味及劲头等感官质量指标与目标配方的差异不显著。

In view of the problems of weak objectivity and low design efficiency for traditional tobacco leaf formulation design,a method of tobacco formulation design was proposed based on the quality characterization by near infrared spectroscopy.The prediction model including conventional chemical compositions,position and aroma type was established by partial least square method,to predict the quality indexes of tobacco leaves.Using quality index as multidimensional vectors a comprehensive quality representation index was constructed.According to the rule of“similar substitution”,a set of candidate tobacco leaves was formed refer to the original tobacco grade in the target module to screen similar substitute tobacco leaves.The proportion of tobacco leaf in the substitute module is calculated by linear programming method.Using a combination of indicator evaluation and sensory verification to the effectiveness was verified for Sichuan tobacco leaf formulation designed in 2020.The results showed that the relative error of the tobacco leaf position,total sugar,reducing sugar,total alkaloids,and total nitrogen content was less than 6%between the substitute formula and the target formula.Except for stimulating indicators,there was no significant difference in sensory quality indicators such as aroma content,clarity,diffusivity,group nature,impurities,aftertaste,and strength between the substitute formulation and the target formulation.