基于电子鼻评价不同贮藏期蜜桔鲜榨汁品质的研究

为建立一种快速无损检测蜜桔鲜榨汁品质的方法,将宫川蜜桔(satsuma mandarins)置于20℃、相对湿度85%条件下贮藏,每3 d随机选取10个果实制成汁,利用PEN3电子鼻检测其香气,同时测定其主要品质指标并进行相关性分析。通过主成分分析(Principal Component Analysis,PCA)、线性判别分析(Linear Discriminant Analysis,LDA)对不同贮藏时间的蜜桔进行区分。结果显示:电子鼻传感器响应值与蜜桔鲜榨汁可溶性固形物含量和VC含量显著相关;线性判别分析能较好地区分出不同贮藏时间的蜜桔;负荷加载分析(Loading analysis)结果显示,传感器W1S(主要对甲烷灵敏)、W2S(对乙醇灵敏,也对部分芳香型化合物灵敏)和W2W(对芳香成分和有机硫化物灵敏)在蜜桔鲜榨汁品质评价中起主要作用。结果表明利用电子鼻技术有望实现对蜜桔鲜榨汁品质的快速无损检测。 

Quality evaluation of fresh satsuma mandarins juice during storage of satsuma mandarins by electronic nose

To establish a rapid non- destructive evaluation system of fresh satsuma mandarin juice qualities,a portable electronic nose PEN3 was used for the aroma analysis.In this study,Miyagawa Wase Satsuma mandarin were stored in 20 ℃ and 85% relative humidity.Ten fruits were picked randomly to make juice every 3 days,then determine their aroma by PEN3.Principal component analysis( PCA) and linear discrimination analysis( LDA) were used to discriminate freshness of the fruits. The results showed that the response values of electronic nose and soluble solid content,and ascorbic acid content were correlated. Meanwhile,it was indicated by loading analysis that sensors W1 S,W2S and W2 W played a central role in evaluating the freshness of Satsuma mandarin.The use of LDA was able to better discriminate mandarin oranges of different postharvest storages.Therefore,electronic nose can be used as a rapid and non- destructive testing method for quality evaluation of fresh satsuma mandarin juice.