食品科学 ›› 2011, Vol. 32 ›› Issue (16): 257-260.doi: 10.7506/spkx1002-6630-201116055

• 分析检测 • 上一篇    下一篇

电子鼻对不同温度下生鲜羊奶贮藏时间的判定

张虹艳,丁 武*   

  1. 西北农林科技大学食品科学与工程学院
  • 出版日期:2011-08-25 发布日期:2011-07-26
  • 基金资助:
    国家公益性行业(农业)科研专项经费项目(3-45);西北农林科技大学校青年学术骨干支持计划资助项目

Discrimination of Storage Time and Volatile Compositions of Raw Goat Milk by Electronic Nose

ZHANG Hong-yan,DING Wu*   

  1. (College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China)
  • Online:2011-08-25 Published:2011-07-26

摘要: 利用电子鼻PEN3 系统判定常温和冷藏条件下羊奶的贮藏时间。通过电子鼻系统采集羊奶常温贮藏及冷藏期间挥发性成分的响应值,并利用主成分分析法(principal component analysis,PCA)及线性判别分析法(linear discrimination analysis,LDA)对其挥发性成分及贮藏时间进行分析。结果表明:PCA方法既可以区分常温贮藏及冷藏1~6d的生鲜羊奶,还可以对比常温和冷藏条件下贮藏1~6d的羊奶,并表现出了较好的区分性,但是不能分析出贮藏期间羊奶挥发性成分的变化趋势;LDA方法区分效果不及PCA,但明显体现出了羊奶贮藏期间挥发性成分的变化趋势。综合PCA及LDA方法的分析结果,说明电子鼻可以有效地判定常温和冷藏条件下生鲜羊奶的贮藏时间及贮藏期内挥发性成分的变化趋势。

关键词: 电子鼻, 温度, 羊奶, 贮藏时间, 主成分分析法, 线性判别分析法

Abstract: An electronic nose system PEN3 was used to discriminate the storage time of raw goat milk at 4 ℃ and 25 ℃. The volatile composition of goat milk was sampled by PEN3, and the obtained data were analyzed using principal component analysis (PCA) and linear discrimination analysis (LDA). The results showed that PCA method could discriminate the storage temperature and time of raw goat milk except for the variation of volatiles during storage. On the contrary, LDA method could not discriminate the storage temperature and time effectively although it could discriminate the variation in volatiles during storage. These findings collectively indicate that electronic nose can effectively discriminate the storage time of raw goat milk at 4℃ and 25 ℃ and the variation in volatiles during storage.

Key words: electronic nose, goat milk, storage temperature, storage time, principal component analysis (PCA), linear discrimination analysis (LDA)

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