用近红外光谱和特征指标判别国产白肋烟产地及部位间相似性

摘要

以不同产地、等级的国产白肋烟和马里兰烟为试验对象,选取具有代表性特征的上部和中部样品49份,测定其近红外光谱和烟草特征指标,用一阶导数和平滑处理光谱后再进行归一化处理,各指标检测值也进行归一化处理,然后采用PPF(Projection of Basing on Principal Component and Fisher Criterion)投影方法分析样品间部位和产地的相似性.结果表明:1)近红外光谱和特征指标两条途径均可判别烟叶部位与产地;2)根据方差贡献率,最能体现部位特征的因素是生物碱和亚硝胺指标,最能体现产地特征的因素是亚硝胺指标;3)相似性判定可用于工业等级间替代和配方微调.%49 samples from upper and middle part of domestic Burley and Maryland tobacco were selected to determine their near-infrared spectra and chemical-physical indexes.The near-infrared spectroscopy were processed by first derivative and SG smooth,and then by normalization as well as all index values.Similarity of position and origin of the samples were analyzed by PPF projection analysis method.Results indicated that l) both near infrared spectrum and characteristic indexes could distinguish leaf position and origin;2) according to contribution rate of variance factors,characteristics of position was affected by index of alkaloid and TSNAs,while characteristics of origin was affected by index of TSNAs;3) similarity discrimination could be used for replacement between formula and fine-tuning in burley tobacco manufacture.