茶叶学报2025，Vol.66Issue(5)：21-29,9.DOI:10.20045/j.cnki.issn.2096-0220.2025.05.003
不同鲜叶等级制成的福安金牡丹红茶化学元素特征分析
Chemicals in Fu'an Jinmudan Black Teas Made of Different Grades of Leaves
摘要
Abstract
[Objective]Difference in chemicals of black teas made of leaves of varied grades plucked from Camellia sinensis(L.)O.Kuntze cv.Jinmudan was determined,and a discriminant model to differentiate the products established.[Method]Jinmudan tea leaves of 21 super-grade and 14 1st grade were collected from the main tea producing areas of Fu'an city in Fujian province.Contents of 15 minerals and 15 rare earth elements in the teas made were determined by inductively coupled plasma mass spectrometry.A multilayer perceptron(MLP),or neural network,discriminant analysis was performed to construct a regression model on the analytical results with the accuracy of differentiating the teas made from different grades of leaves evaluated by correlation analysis,linear discriminant analysis(Fisher),and multivariate statistical methods.[Result]The minerals in the black teas ranked in content as K>Ca>Mg>Mn>Al>Na>Fe>Zn>Cu>Pb>Sn>Hg>As>Se>Cd,with the 1st four minerals constituting 96.09％of the total.The contents of rare earth elements ranked as Ce>La>Y>Nd>Pr>Sm>Gd>Dy>Yb>Er>Ho>Tb>Eu>Tm>Lu,with Ce being on the top of the list.There were significant positive correlations between Al and Ca and between Fe and Zn,and negative correlations between Cu and some rare earth elements.Among the rare earth,except Ce,significant positive correlations were found between two elements.The linear discriminant analysis(Fisher)showed that the accuracy of the prediction model was 91.4％.Combined with the receiver operating characteristic curve(ROC)and significance analysis,Al,As,and Ca at area under curve>0.7 and P<0.05(Ca contributed the most)were selected as the characteristic elements with unique fingerprints of the various black teas.The MLP discriminant analysis showed the accuracy on the training group to be 93.8％with the 1st level at 77.8％,and on the test group,100％with the 1st level at 60％.Thus,the secured model appeared to be capable of adequately differentiating the Jinmudan black teas made of varied grades of leaves.[Conclusion]The minerals and rare earth elements contained in the Fu'an Jinmudan black teas indicated that Al,Ca,and As were the key indicators that could effectively distinguish the teas made of different grades of leaves.A means to facilitate product quality verification of Jinmudan teas on the market was made available.关键词
红茶/金牡丹/矿质元素/稀土元素/电感耦合等离子体质谱法Key words
Black tea/Camellia sinensis(L.)O.Kuntze cv.Jinmudan/minerals/rare earth elements/inductively coupled plasma mass spectrometry分类
农业科技引用本文复制引用
林馨颖,陈静,徐梦婷,任卫威,黄先洲,俞水荣,罗钦,叶乃兴..不同鲜叶等级制成的福安金牡丹红茶化学元素特征分析[J].茶叶学报,2025,66(5):21-29,9.基金项目
福建省中青年教师教育科研项目(JAT231281) （JAT231281）
福建省属公益类科研院所基本科研项目——自主选题项目(2022R1022004) （2022R1022004）
福建农林大学科技创新专项基金项目(CXZX 2025 KFB24102A) （CXZX 2025 KFB24102A）
2023年福建省星火计划项目(2023S0062). （2023S0062）
