不同产地沙棘叶茶品质分析及综合评价

Quality analysis and comprehensive evaluation of seabuckthorn leaf tea from different producing areas

该文对不同产地沙棘叶茶进行水分、水浸出物、茶多酚等理化成分的检测和感官评价,运用聚类分析、相关性分析、差异性分析、主成分分析以及综合得分模型对来自6个产地的沙棘叶茶进行了综合评价。新疆沙棘叶茶的感官综合得分高于其他产地沙棘叶茶,在香气和叶底嫩度方面显著优于其他产地沙棘叶茶(P<0.05)。不同产地沙棘叶茶的理化指标存在显著差异(P<0.05),尤其是咖啡碱、酚氨比、总黄酮和茶多糖;理化指标与感官品质存在一定的相关性,外形与水浸出物含量之间呈显著正相关(P<0.05),酚氨比与干物质含量之间呈极显著正相关(P<0.01),与游离氨基酸含量呈显著负相关(P<0.05)。通过主成分分析提取了3个主成分,累计贡献率为88.623%,综合得分从高到低依次为新疆沙棘叶茶、阳泉沙棘叶茶、吕梁沙棘叶茶、甘肃沙棘叶茶、忻州沙棘叶茶、东北沙棘叶茶。该研究结果可为优质沙棘叶茶资源的选育提供一定的帮助,促进沙棘资源的进一步开发利用。

This study aimed to analyze the quality difference of seabuckthorn leaf tea from different producing areas and evaluate it comprehensively.The physicochemical components including water content,water-soluble extracts,tea polyphenols,and sensory evaluation of seabuckthorn leaf tea from different origins were determined.Cluster analysis,correlation analysis,difference analysis,principal component analysis,and comprehensive score model were used to comprehensively evaluate seabuckthorn leaf tea from six different production areas.The sensory comprehensive score of Xinjiang seabuckthorn leaf tea was higher than that of seabuckthorn leaf tea from other regions,and in terms of aroma and leaf base tenderness,it was significantly better than that of seabuckthorn leaf tea from other regions(P<0.05).There were significant differences in physicochemical indexes of sea-buckthorn leaf tea from different producing areas(P<0.05),especially caffeine,phenol-ammonia ratio,total flavonoids,and tea polysaccharides.There was a certain correlation between physicochemical indexes and sensory quality,including a significant positive correlation between appearance and water extract content(P<0.05),a highly significant positive correlation between phenol-ammonia ratio and dry matter content(P<0.01),and a significant negative correlation with free amino acid content(P<0.05).Three principal components were extracted by principal component analysis,with a cumulative contribution rate of 88.623%.The comprehensive scores are ranked from high to low as follows:Xinjiang seabuckthorn leaf tea,Yangquan seabuckthorn leaf tea,Lvliang seabuckthorn leaf tea,Gansu seabuckthorn leaf tea,Xinzhou seabuckthorn leaf tea,and Northeast seabuckthorn leaf tea.The research results can provide assistance for the breeding of high-quality seabuckthorn leaf tea resources and promote the further development and utilization of seabuckthorn resources.