密集烘烤过程中基于色度学和形态学的烤烟外观变化与化学成分关系

Relationship between changes of appearance characteristics and chemical components of tobacco leaves based on colorimetry and morphology during bulk curing

以烤烟中部叶为试验材料,对密集烘烤过程中烤烟颜色参数(L*、a*、b*)、形态特征变化及其与主要化学成分的关系进行了研究。结果表明:密集烘烤过程中烤烟叶片正面与背面各颜色指标变化趋势基本一致,且烘烤前期变化较大,烘烤后期变化幅度较小,同时正面变化速度较背面快。烘烤开始时烟叶厚度收缩率一直呈现较大变化,进入干筋期变化趋势减缓;其余各形态指标前期变化幅度较小,中期相对剧烈,后期又逐渐减缓。相关分析表明,烟叶正面和背面L*、a*、b*与烟叶形态和主要化学成分大部分达到显著或极显著水平。回归分析表明,烤烟烟叶颜色参数与其形态和化学成分各指标的回归方程表现出较好的拟合度。烘烤过程中烟叶颜色参数的变化可以用来定量预测形态和主要化学成分的变化。

Using flue-cured tobacco cutters as experimental materials,changes of color indexes（L＊,a＊,b＊）,states of tobacco leaves and their relationship with main chemical components were studied to provide a theoretical basis for the optimization of curing technology and precise and intelligent control of curing process.Results showed that color indexes of front and back side of tobacco leaves had the same trends during bulk curing.It had big changes in the prior period,and small changes during later periods of curing process.Front side changed faster than back side.Thickness shrinkage showed a large change rate since the start of the curing,while it slowed down in stem-drying stage.The rest of the state indexes had larger changes in middle and smaller changes in prior and later period.Correlation analysis showed that certain relationships existed among color indexes,states of tobacco leaves and chemical components,most of which were significant or extremely significant.Regression analysis indicated that the regression equation had a high fitting degree and these models could be used to predict the states of tobacco leaves and chemical components.