不同储存时间对龙眼叶生化成分的影响

Effects of Different Storage Time on Biochemical Components of Longan Leaves

目的:龙眼是一种集药用、材用、观赏价值于一体的多功能树种,目前在广东部分地区有饮用龙眼叶茶的习惯。通过了解龙眼叶的功能性成分的变化规律,以便更好地发挥其相应的保健功效。方法:以不同储存时间的龙眼叶为原料,将采摘后的龙眼叶按白茶的加工方法进行加工并储存后,检测其主要内含生化成分变化情况。结果:随着储存时间的延长,龙眼叶的水浸出物含量从24.44%降至19.32%,后又增至21.38%;总可溶性蛋白含量基本维持在1.29%左右;多酚类含量从12.33%下降至10.61%;黄酮类从12.26%降至8.27%;水溶性糖从1.11%降至0.60%,这三类物质的含量都在下降;游离氨基酸的含量从1009.443ug/g降至34.246ug/g,且组成成分也在不断消失或转变。结论:龙眼叶的生化成分会随着储存时间的延长而下降,为充分有效利用龙眼叶的生化成分,应尽量减少其储存时间。

Objective:longan is a multi-functional tree with medicinal,material and ornamental value.At present,longan leaf tea is used in some areas of Guangdong.Mastering the changes of the functional components of longan leaves will be helpful to giving full play to its health function.Methods:longan leaves with different storage time were taken as raw materials,and the harvested longan leaves were processed and stored according to the processing method of white tea,and the changes of its main biochemical components were detected.Results:with the extension of storage time,the water extract content of longan leaves decreased from 24.44%to 19.32%,and then increased to 21.38%;the total soluble protein content was maintained at about 1.29%;the content of polyphenols decreased from 12.33%to 10.61%;flavonoids decreased from 12.26%to 8.27%;water soluble sugar decreased from 1.11%to 0.60%,and the content of all three substances decreased;the content of free amino acids decreased from 1009.443ug/g to 34.246ug/g,and the components were also disappearing or changing.Conclusion:the biochemical components of longan leaves decrease with the extension of storage time,and in order to make full use of the biochemical components of longan leaves,the storage time should be minimized.