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低场核磁共振结合主成分分析法快速检测掺假牛乳
引用本文:姜 潮,韩剑众,范佳利,田师一.低场核磁共振结合主成分分析法快速检测掺假牛乳[J].农业工程学报,2010,26(9):340-344.
作者姓名:姜 潮  韩剑众  范佳利  田师一
作者单位:浙江工商大学食品质量与安全系,浙江省食品安全重点实验室,杭州,310035
基金项目:浙江省“重中之重”项目子项目(ZZ05-07);浙江省高校中青年学科带头人专项经费
摘    要:以掺假牛乳样品为低场核磁共振检测对象,利用主成分分析法(PCA)分析处理Carr-Purcell-Meiboom-Gill (CPMG)序列的检测数据,旨在探求一种能有效分析处理样品弛豫数据的快速方法,并用于牛乳品质的监控。对几种常见掺假形式的(掺入水、食盐、尿素、豆浆等)牛乳样品、复原乳以及纯牛乳样品进行了检测和评价。试验结果表明:纯牛乳和掺入不同物质的掺假牛乳在主成分得分图上可以得到很好的区分;纯牛乳、复原乳及其混合乳也得到了有效的辨识;同时各种掺假牛乳样品随掺假物质的掺加比例在图中呈规律性分布。PCA法可用于快速分析处理低场核磁共振数据,低场核磁共振结合PCA法在乳制品的质量控制及评价中具有较大的应用潜力。

关 键 词:主成分分析法(PCA),无损检测,品质控制,低场核磁共振(LF-NMR),掺假牛乳,CPMG序列
收稿时间:2010/1/23 0:00:00
修稿时间:2010/9/20 0:00:00

Rapid detection of adulterated milk by low field-nuclear magnetic resonance coupled with PCA method
Jiang Chao,Han Jianzhong,Fan Jiali and Tian Shiyi.Rapid detection of adulterated milk by low field-nuclear magnetic resonance coupled with PCA method[J].Transactions of the Chinese Society of Agricultural Engineering,2010,26(9):340-344.
Authors:Jiang Chao  Han Jianzhong  Fan Jiali and Tian Shiyi
Abstract:The adulterated milk samples were tested by the CPMG sequence of the low field-nuclear magnetic resonance. In order to search for a method to analyze and process the sample data rapidly and effectively, principal component analysis (PCA) was used to monitor milk quality. Milk samples adulterated with water, salt, urea or soybean milk, reconstituted milk and pure milk were prepared for the LF-NMR testing and evaluation. The results showed that LF-NMR can be used to distinguish between pure milk and different kinds of adulterated milk. Pure milk, reconstituted milk and their mixed milk were an effective identification. There was effective identification among pure milk, reconstituted milk and their mixed milk. The application of LF-NMR in adulterated milk with different additive proportions showed the similar result, too. The PCA method can be used to analyze and process the test data of LF-NMR. LF-NMR coupled with PCA shows a greater potential in the evaluation of dairy products quality.
Keywords:principal component analysis  nondestructive examination  quality control  LF-NMR  adulterated milk  CPMG sequence
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