摘要
采用电感耦合等离子体质谱(inductively coupled plasma mass spectrometry,ICP-MS)结合化学计量学统计工具对湖南安化黑茶开展原产地判别研究。采用ICP-MS对安化黑茶及其他产地黑茶中的B、Li、P等48种元素进行定量分析,得到黑茶元素指纹图谱。应用化学计量学统计工具对不同原产地黑茶中元素分布进行特征分析、逐步判别分析、主成分分析和偏最小二乘判别分析,结果表明主成分得分投影图和偏最小二乘判别分析图都能很好地对湖南安化黑茶与其他原产地黑茶进行有效区分和识别;湖南安化黑茶与其他产地黑茶具有显著性差异的元素有Li、Pb、Ga等19种,其中被引入产地判别模型的元素有7种,依次为Li、Pb、Ga、Ce、Rb、Cs和Na,所建立的判别模型对样品回代检验判别率为100%,交叉验证判别率为98%。结果表明基于元素指纹图谱能够对湖南安化黑茶的原产地进行有效判别。
In this study,we discriminated the geographical origin of Hunan Anhua dark tea by using inductively coupled plasma mass spectrometry(ICP-MS)combined with chemometrics.Quantitative analysis of 48 elements such as B,Li and P was carried out in Hunan Anhua dark tea and those from other geographical origins by ICP-MS,and an elemental fingerprint for Anhua dark tea was obtained.The element distribution in dark teas from different geographical origins was evaluated by characteristic analysis,discriminant analysis,principal component analysis(PCA)and partial least squares-discriminant analysis(PLS-DA).In the PCA and the PLS-DA score plots,Anhua dark tea was effectively discriminated from those from other regions.Nineteen elements including Li,Pb and Ga were significantly different between Anhua dark tea and those from other regions.Seven key elements(Li,Pb,Ga,Ce,Rb,Cs and Na)were introduced into the discriminant analysis model.The correct discrimination rate of the mode was 100%and 98%in back substitution and cross-validation test,respectively.The results showed that the elemental fingerprint could be used for the geographical origin discrimination of Anhua dark tea.
作者
杨纯
颜鸿飞
吕小园
陆静
贺鹏
YANG Chun;YAN Hongfei;Lü Xiaoyuan;LU Jing;HE Peng(Technology Center of Changsha Customs District,Changsha 410004,China)
出处
《食品科学》
EI
CAS
CSCD
北大核心
2020年第16期286-291,共6页
Food Science
基金
国家质量监督检验检疫总局科技计划项目(2017IK112)。
关键词
电感耦合等离子体质谱
元素指纹图谱
主成分分析
偏最小二乘判别分析
安化黑茶
识别
inductively coupled plasma mass spectrometry
elemental fingerprint
principal component analysis
partial least squares discriminate analysis
Anhua dark tea
discrimination
