基于电子鼻技术对云南普洱熟茶的香气品质判别  

Aroma Quality Discrimination of Yunnan Pu'er Ripe Tea Based on Electronic Nose

作　　者：陈婷[1] 蒋明忠[2] 彭文[1] 冯博[1] 王白娟[1] 

机构地区：[1]云南农业大学,云南昆明650201 [2]云南警官学院,云南昆明650223

出　　处：《西南农业学报》2017年第2期339-344,共6页Southwest China Journal of Agricultural Sciences

基　　金：国家自然科学基金(61561054)

摘　　要：利用电子鼻技术对云南普洱熟茶进行香气分析及判别,为普洱熟茶的品质分级及筛选提供理论依据,促进普洱熟茶品质判别的数字化。采用电子鼻技术对具有典型代表的9个云南普洱熟茶进行了检测。通过Winmuster软件,利用主成分分析法PCA、线性判别法LDA和传感器区别贡献率分析法(Loadings)对样品进行分析。PCA分析结果显示,可以将同品牌不同年份的普洱熟茶香气完全区分开,且效果较好,区分度可达99.9%。LDA分析结果显示,通过线性判别,选择合适的判别式,可以较好地将同一品牌不同年份的普洱熟茶区分开,说明不同年份的普洱熟茶其挥发物成分存在较大差异,可以被电子鼻检测区别开。Loadings分析结果显示,10个传感器中,7、2和9号作为此次分析的关键传感器,对茶叶香气的响应明显,对区分贡献率最大。研究结果表明,电子鼻这种快速无损的新方法是一种有效的通过气味来评价茶叶品质的技术,可以用于云南普洱熟茶香气品质判别,对于不同年份的普洱熟茶有非常好的区分度。The aroma of Yunnan Purr ripe tea was analyzed and identified by using electronic nose technology, which provided theoretical ba- sis of quality classification and screening for Pu＇ er ripe tea, promoted the digitization of quality classification for Purr tea. In this paper, 9 typical Yunnan Purr ripe teas had been detected by electronic nose technology, and the samples were analyzed with the methods of Principal Component Analysis （PCA） , Linear Discriminant Analysis （LDA） and Loadings Analysis （Loadings） by using system-provided Winmuster software. PCA analysis showed that aroma of Purr ripe tea of the same brand of different years could be completely separated, and better dis- tinction of up to 99.9 %. LDA analysis showed that selecting the appropriate discriminant, could better distinguish different years Purr ripe tea of the same brand, it illustrated there were differences among the volatile components in different years of Purr ripe tea which could be detected by electronic nose. Loadings analysis showed that in the 10 sensors, No. 7, 2 and 9 were the key sensors of the analysis, and their responses to the tea aroma were obvious, and the contribution rate was the biggest. The research shows that the rapid and non-destructive method of electronic nose is an effective method to evaluate the quality of tea by the smell, which can be used for discrimination of aroma quality of Yunnan Purr ripe tea, and it can better distinguish Purr ripe tea of different years.

关 键 词：电子鼻 普洱熟茶 香气 品质判别 

分 类 号：S24[农业科学—农业电气化与自动化]