烤烟表面颜色的量化及其与胡萝卜素类物质的关系

为揭示我国不同产区烤烟颜色特征差异的成因,采用L*a*b*均匀颜色空间的颜色表征方法对我国11个省60个产烟县的C3F烟叶进行了测量分析,并研究了烤烟颜色的色空间分布指标与类胡萝卜素含量的关系。结果表明:①我国不同产区烤烟颜色的色空间指标明度L*、红度a*、黄度b*、色饱和度c*及类胡萝卜素类物质差异明显,东南烟区烟叶的明度、黄度和色饱和度较低,红度较高,类胡萝卜素含量较低,叶黄素比例较高;长江中上游和西南烟区烟叶的明度、黄度和色饱和度较高,红度相对较低,类胡萝卜素含量较高;北方烟区烟叶的明度相对较高,色饱和度相对较低,类胡萝卜素含量较低。②烤烟类胡萝卜素类物质与颜色色空间分布指标关系密切,随类胡萝卜素含量的提高,红度、黄度、色饱和度等指标均呈现出显著上升趋势,明黄度比值呈显著下降趋势。

Quantitation of Surface Color of Flue-cured Tobacco Leaves and its Relationship with Carotenoid

In order to reveal the possible causes about the color difference among flue-cured tobacco leaves of different growing areas in China,the surface color of tobacco leaves,C3F,from 60 counties in 11 provinces were measured,analyzed and characterized with L*a*b* uniform color space.The relationship between surface color spatial distribution characteristics of and carotenoid content in leaves was investigated.The results showed that: 1) The surface color spatial distribution indexes,L*(brightness),a*(red chroma),b*(yellow chroma),c*(color saturation),and carotenoid content were obviously different among leaves from different areas.The L*,b*,c* and carotenoid content in tobacco leaves from the southeast tobacco belt were lower,while a* and lutein proportion were higher;for tobacco leaves from the upper and middle reaches of the Yangtze River and the southwest tobacco belts,L*,b*,c* and carotenoid content were higher,while a* was relatively lower;L* of tobacco leaves from the northern tobacco belt was relatively higher,while c* and carotenoid content were relatively lower.2) The carotenoid content in tobacco leaves closely correlated to leaf’s surface color spatial distribution indexes.With the increase of carotenoid content,a*,b*,and c* increased significantly,however the ratio of L* to b* decreased significantly.