基于电子鼻对水蜜桃货架期评价的研究  

Freshness Evaluation of Juicy Peach by Electronic Nose

作　　者：江琳琳[1] 潘磊庆[1] 屠康[1] 杨虹贤[1] 钱钊[1] 韩东海[2] 

机构地区：[1]南京农业大学食品科技学院,农业部农畜产品加工与质量控制重点开放实验室,江苏南京210095 [2]中国农业大学食品与营养工程学院,教育部果蔬加工工程研究中心,北京100083

出　　处：《食品科学》2010年第12期229-232,共4页Food Science

基　　金：国家“863”计划项目(2007AA10Z213);江苏省农业攻关项目(BE2007320);南京农业大学校青年科技创新基金项目(Y200827);南京农业大学大学生创新训练计划项目(SRT0908A04);中农-南农青年教师开放基金项目(NC2008004)

摘　　要：利用PEN3电子鼻系统对早熟"久保"水蜜桃采后7d货架期内的芳香成分进行检测分析,先通过电子鼻系统动态采集水蜜桃芳香成分并得到了电子鼻的响应值,再利用PCA(主成分分析)、LAD(线性判别)模式识别方法进行数据分析。结果表明LDA方法能够更好地区分第1天、第2～4天和第5～7天货架期的水蜜桃,进行交叉确认分析后,对第1天、第2～4天和第5～7天的水蜜桃货架期区分准确率达91%,同时采用负荷加载(Loading)分析方法可以得知,传感器W1S(甲烷)、W2S(乙醇)、W2W(硫化氢类)对水蜜桃货架期的评价起主要作用,这为进一步优化传感器以及探索方便快捷的水蜜桃无损检测技术提供了依据。In this study,a portable electronic nose PEN3 was used for the aroma analysis of Jiubao juicy peach,an early-ripening cultivar in order to provide experimental references for the evaluation of its freshness.Dynamic aroma sampling was achieved using PEN3 and the response values of the instrument were obtained.This was followed by data analysis using principal component analysis（PCA） and linear discrimination analysis（LDA）.The results showed that the use of LDA was able to better discriminate peaches on the 1st,2nd to 4th,and 5th to 7th days of postharvest storage in polyethylene bags under the conditions of（20 ±0.5）℃ and 65%-70% relative humidity.According to cross-validation analysis,the discrimination accuracy among these samples stored for different storage periods was as high as 91%.Meanwhile,it was indicated by loading analysis that sensors W1S,W2S and W2W played a central role in evaluating the freshness of juicy peach,which provides useful evidences for the optimization of sensors and exploration into a simple and convenient non-destructive technique for the evaluation of juicy peach freshness.

关 键 词：久保水蜜桃 电子鼻 货架期 评价 

分 类 号：TP242[自动化与计算机技术—检测技术与自动化装置] S129[自动化与计算机技术—控制科学与工程]