摘要
为探究不同冲泡时间和次数对藤茶活性成分的影响,本研究测定了藤茶(茶水比1∶50)分别在沸水冲泡5 min、10 min、20 min、30 min、1 h、2 h、4 h、6 h、8 h、12 h、24 h和冲泡5次的(2R,3R)-二氢杨梅素、(2S,3S)-二氢杨梅素、花旗松素、杨梅苷、杨梅素、多酚、可溶性糖、水溶性浸出物含量,同时进行主成分分析.结果表明,(2R,3R)-二氢杨梅素、(2S,3S)-二氢杨梅素、花旗松素、多酚的含量随冲泡时间的增加均呈先升后降的趋势,含量最高时冲泡时间均为30 min;杨梅苷、可溶性糖的含量随冲泡时间的增加均呈先上升后逐渐趋于平缓的趋势,含量最高时冲泡时间分别为6 h、8 h;杨梅素的含量随冲泡时间的增加呈逐渐上升的趋势,含量最高时冲泡时间为24 h;7种活性成分和水溶性浸出物的含量均随冲泡次数的增加呈显著下降趋势;主成分分析共提取特征值大于1的主成分2个,方差累计贡献率98.225%,同时建立活性成分评价模型Y=0.761 79Y1+0.220 45Y2.藤茶冲泡时间为30 min时,活性成分综合评分最高,冲泡2次(每次25 min)时,多种活性成分溶出率达95%以上,本研究可为藤茶的科学饮用提供理论依据.
Abstract
In order to explore the effects of active ingredients in vine tea with different brewing times and cycles,this study measured the contents of(2R,3R)-dihydromyricetin,(2S,3S)-dihydromyricetin,taxifolin,myricitrin,myricetin,polyphenols,soluble sugar,and water-soluble extracts of vine tea brewed in boiling water at 1:50 tea-water ratio for 5 min,10 min,20 min,30 min,1 h,2 h,4 h,6 h,8 h,12 h,24 h and 5 cycles.Principal component analysis was also conducted.The results showed that the contents of(2R,3R)-dihydromyricetin,(2S,3S)-dihydromyricetin,taxifolin and polyphenols all increased first and then decreased with the increase of brewing time,and the brewing time for the highest contents were 30 min.With the increase of brewing time,the content of myricitrin and soluble sugar initially increased and then gradually leveled off,and the brewing time for the highest contents were 6 h and 8 h,respectively.The content of myricetin increased gradually with the increase of brewing time,and the brewing time for the highest content was 24 h.The contents of 7 active components and water-soluble extracts decreased significantly with the increase of brewing cycles.Two principal components with eigenvalues greater than 1 were extracted by principal component analysis,and the cumulative contribution rate of variance was 98.225%.Meanwhile,an active components evaluation model was established:Y=0.761 79Y1+0.220 45Y2.When the brewing time of vine tea was 30 min,the comprehensive score of active components was the highest,and when brewed 2 cycles for 25 minutes each time,the dissolution rate of various active components could reach over 95%.This study could provide a theoretical basis for the scientific drinking of vine tea.
基金项目
湖北省标准化试点示范项目(HUBS-A-N-10-2023)
恩施州科技指导性项目(JCY2022000003)
国家科技期刊平台
NSTL
万方数据