Zhu Zhenling, Lai Yan, Xiong Yan, Xiao Yong, Wei Yihua, Zhang Jinyan, Li Siming
Institute of Quality Safety and Standards of Agricultural Products, Jiangxi Academy of Agricultural Sciences, Nanchang, China.
Key Laboratory of Quality and Safety Control of Poultry Products, Ministry of Agriculture and Rural Affairs, Nanchang, China.
J Sci Food Agric. 2025 Feb;105(3):2068-2076. doi: 10.1002/jsfa.13982. Epub 2024 Oct 29.
Xiushui Ninghong tea (XSNH) has a long history and is renowned both in China and internationally. Based on different processing techniques, XSNH can be classified into Ninghong Congou, Ninghong Tea Jinhao, Ninghong Tea Longxucha and other types. To investigate the differences in nutrient compounds and mineral element contents among various types of XSNH, 34 samples from seven types were collected, primarily from tea-producing areas.
Statistical analysis indicated no significant differences in the contents of crude polysaccharides, K, Mg and Fe, whereas significant differences were observed in the levels of moisture, free amino acids, caffeine, tea polyphenols, thearubigin, theaflavins, Zn, P, Mn, Cu and Se. The data were analyzed using various statistical methods such as hierarchical cluster analysis, principal component analysis and partial least squares discriminant analysis. Characteristic compounds and elements such as theaflavin, Se, free amino acids, P and tea polyphenols were identified as key differential components for distinguishing different sample types.
Our research has highlighted the differences in chemical indicators among various types of XSNH, providing a crucial theoretical basis for the future classification and grading of XSNH quality. © 2024 Society of Chemical Industry.
修水宁红茶历史悠久，在国内外都享有盛誉。根据不同的加工工艺，修水宁红茶可分为宁红工夫、宁红金毫、宁红龙须茶等类型。为了研究不同类型修水宁红茶中营养成分和矿质元素含量的差异，从七个类型中收集了34个样本，主要来自茶叶产区。
统计分析表明，粗多糖、钾、镁和铁的含量没有显著差异，而水分、游离氨基酸、咖啡因、茶多酚、茶红素、茶黄素、锌、磷、锰、铜和硒的含量存在显著差异。使用层次聚类分析、主成分分析和偏最小二乘判别分析等多种统计方法对数据进行了分析。茶黄素、硒、游离氨基酸、磷和茶多酚等特征化合物和元素被确定为区分不同样本类型的关键差异成分。
我们的研究突出了不同类型修水宁红茶化学指标的差异，为未来修水宁红茶品质的分类和分级提供了重要的理论依据。© 2024化学工业协会。
