浙江农业学报 ›› 2026, Vol. 38 ›› Issue (6): 1112-1125.DOI: 10.3969/j.issn.1004-1524.20260090

• 未来食品与健康 • 上一篇    下一篇

基于近红外光谱技术的西藏牦牛酥油掺假快速无损鉴别

李文珍1,2,3(), 梅涵一2,3, 王树林1, 聂晶2,3, 李春霖2,3, 张永志2,3, 邓丰涛4, 袁玉伟2,3,*()   

  1. 1 青海大学 农牧学院, 青海 西宁 810016
    2 浙江省农业科学院 农产品质量安全与营养研究所, 浙江 杭州 310021
    3 农业农村部农产品信息溯源重点实验室, 浙江 杭州 310021
    4 浙江红谱科技有限公司, 浙江 杭州 310030
  • 收稿日期:2026-02-04 出版日期:2026-06-25 发布日期:2026-07-14
  • 作者简介:李文珍,研究方向为食品加工与安全。E-mail: 3483295317@qq.com
  • 通讯作者: *袁玉伟,E-mail: yuanyw@zaas.ac.cn
  • 基金资助:
    西藏自治区科技计划项目(课题)(XZ202402ZY0007);浙江省农业科学院学科建设专项经费项目(ZAAS2025)

Rapid and non-destructive identification of adulteration in Xizang yak ghee based on near infrared spectroscopy

LI Wenzhen1,2,3(), MEI Hanyi2,3, WANG Shulin1, NIE Jing2,3, LI Chunlin2,3, ZHANG Yongzhi2,3, DENG Fengtao4, YUAN Yuwei2,3,*()   

  1. 1 College of Agriculture and Animal Husbandry, Qinghai University, Xining 810016, China
    2 Institute of Agro-Product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
    3 Key Laboratory of Information Traceability for Agricultural Products, Ministry of Agriculture and Rural Affairs, Hangzhou 310021, China
    4 Zhejiang Hongpu Technology Co., Ltd., Hangzhou 310030, China
  • Received:2026-02-04 Published:2026-06-25 Online:2026-07-14

摘要:

本研究旨在建立一种基于近红外光谱(near infrared spectroscopy,NIR)技术的西藏牦牛酥油掺假快速、无损鉴别方法。以采集自西藏林芝和那曲的传统手工牦牛酥油为研究对象,按不同比例(0、20%、40%和60%)掺入棕榈油、牛油和人造奶油制备掺假样品,并测定其酸价、含水量、过氧化值、脂肪含量等理化指标;采用主成分分析(principal component analysis,PCA)对NIR光谱特征进行无监督降维与结构分析,并在PCA基础上构建有监督支持向量机(support vector machine,SVM)和k近邻(k-nearest neighbor, KNN)模型进行掺假鉴别。结果表明,不同掺假油脂对牦牛酥油理化指标的影响呈特异性规律:酸价偏低或含水量降低可能存在棕榈油掺假;酸价偏高或过氧化值上升可能存在高比例牛油掺假;含水量显著偏高是人造奶油掺假的关键依据;脂肪含量可与其他3个指标联合作为酥油掺假鉴别依据。PCA得分图显示,不同类别样品在主成分空间中存在一定分布差异,但类别间仍有重叠,难以形成清晰判别边界。SVM和KNN模型在独立测试集上的分类准确率均达到100%。综上,NIR原始光谱吸光度变化与掺假类型及其比例高度相关,结合化学计量学方法能够实现西藏牦牛酥油的有效掺假识别,为传统牦牛酥油品质保障提供了一种高效可靠的技术手段。

关键词: 近红外光谱技术, 西藏牦牛酥油, 掺假鉴别, 品质

Abstract:

This study aimed to establish a rapid and non-destructive adulteration identification method for Xizang yak ghee by using near infrared spectroscopy (NIR) technology. Traditional handmade yak ghee was collected from Nyingchi and Nagqu in Xizang as research materials. Adulterated samples were prepared by mixing palm oil, beef tallow, and margarine into yak ghee at different proportions (0, 20%, 40% and 60%). The physicochemical indices including acid value, moisture content, peroxide value and fat content were determined. Principal component analysis (PCA) was applied to perform unsupervised dimensionality reduction and structural analysis on NIR spectral characteristics. On the basis of PCA results, supervised chemometric models including support vector machine (SVM) and k-nearest neighbor (KNN) were constructed to realize ghee adulteration identification. The results showed that different adulterated oils presented specific effects on the physicochemical characteristics of yak ghee. Lower acid value and decreased moisture content could be regarded as characteristic indicators of palm oil adulteration; higher acid value and increased peroxide value were closely related to high-proportion beef tallow adulteration; significantly increased moisture content was the key discrimination index for margarine adulteration. Fat content could be combined with the other three physicochemical indices to jointly identify adulteration in yak ghee. PCA score plots indicated that samples with different adulteration types and proportions showed partial distribution differences in the principal component space, while obvious category overlaps still existed, resulting in unclear discriminative boundaries. Both the SVM and KNN models achieved 100% classification accuracy on the independent test set.In conclusion, the absorbance changes of original NIR spectra were highly correlated with adulteration types and adulteration ratios of yak ghee. Combined with chemometric methods, NIR spectroscopy could efficiently and accurately identify adulteration in Xizang traditional yak ghee. This study provided an efficient, reliable and rapid technical reference for quality supervision and quality assurance of plateau characteristic yak ghee products.

Key words: near-infrared spectroscopy, Xizang yak ghee, adulteration identification, quality

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