冲泡条件对青钱柳茶主要内含物浸出规律的影响

【目的】青钱柳是我国特有的多功能树种,其叶制成的茶是一种重要的保健茶,研究旨在优化青钱柳茶的冲泡条件,发挥茶叶最大功效。【方法】在研究茶水质量体积比、冲泡温度、冲泡时间等单因素对青钱柳茶主要内含物质(总黄酮、总三萜和粗多糖)浸出规律影响的基础上,采用L_9(3~4)正交设计以优化青钱柳茶冲泡的最佳条件。【结果】茶水质量体积比对青钱柳茶中总黄酮、总三萜浸出量有显著影响,冲泡时间对青钱柳茶中总黄酮、总三萜和粗多糖的浸出量均有显著影响,而冲泡温度仅对青钱柳茶中粗多糖的浸出量有显著影响(P0.05)。通过正交试验优化出的青钱柳茶最佳冲泡条件为:茶水质量体积比1∶250,70℃水冲泡15 min。采用该冲泡条件,青钱柳茶叶中总黄酮、总三萜和粗多糖的浸出量均达到最大值,分别为9.83 mg/g、27.46 mg/g、108.67mg/g。【结论】冲泡条件(茶水质量体积比、冲泡温度和冲泡时间)直接影响青钱柳茶中生物活性物质的溶出,所优化出的青钱柳茶冲泡条件可科学指导饮茶,充分发挥青钱柳茶的保健作用。

Effect of brewing conditions on the leaching rate of Cyclocarya paliurus tea compounds

Objective] Cyclocarya paliurus is an alternative tree species,and its leaves have traditionally been used as a nutraceutical tea.However,little is known about the appropriate brewing conditions for scientific or therapeutic purposes.The objective of the present study was to optimize the brewing conditions of C.paliurus tea.Method] The optimum ratio of m (tea) to V (water),brewing temperature,and brewing time on the leaching rate of total flavonoids,total triterpenoids,and crude polysaccharides of C.paliurus tea were investigated using an L9 (34) orthogonal test.Result] The ratio of m (tea) to V (water) significantly affected the leaching rate of total flavonoids and total triterpenoids,whereas brewing time significantly affected the leaching rate of total flavonoids,total triterpenoids and crude polysaccharides,and brewing temperature only had a significant effect on crude polysaccharide content (P＜ 0.05).The orthogonal experiment test indicated that the highest total ffavonoid,total triterpenoid and crude polysaccharide contents were obtained usinga ratio of m (tea)to V (water) by 1∶250,brewing temperature of 70 ℃,and brewing time of 15 min.Under these conditions,the total flavonoid,total triterpenoid and polysaccharide contents reached 9.83 mg/g,27.46 mg/g and 108.67 mg/g,respectively.Conclusion] Brewing conditions directly affect the leaching rate of bioactive substances from C.paliurus tea,and the optimized brewing conditions proposed by the present study provide a reference for brewing C.paliurus tea.