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Abstract

The comparative analysis was performed for the biochemical components, and volatile of tea leaves from Danxia 8 treated at different withering time. The regularity of biochemical characteristics and aroma profile were expected to find out by statistical methods. The results showed that tea polyphenols increased significantly from 0 h to 23 h, and then decreased significantly. The content of free amino acids increased significantly from 0 h to 16 h, while theanine decreased remarkably. The contents of free amino acids and theanine decreased significantly in the next time. At the whole withering process, caffeine content increased significantly, but theobromine decreased remarkably. Chlorophyll a content had not a significant change. The contents of chlorophyll b and carotenoids decreased significantly from 5 h to 28 h, followed by significant increase. Terpenes were identified as the main volatile of withered leaves from 5 h to 32 h. Terpenols were the main volatile at the time of 0 h and 50 h. Based on principal component analysis, biochemical characteristics and aroma profiles of withered leaves showed a regularity. The biochemical characteristics could be divided into three stages, including 0~16, 23~28 and 32~50 h. The aroma profiles became into four stages, including 0~9, 16~23, 26~32 and 50 h. The time of 16 h and 23 h were the mutual demarcation for biochemical characteristics and aroma profile during the withering process.

Publication Date

2-18-2023

First Page

43

Last Page

49

DOI

10.13652/j.issn.1003-5788.2020.09.007

References

[1] 滑金杰,袁海波,江用文.萎凋过程鲜叶理化特性变化及其调控技术研究进展[J].茶叶科学,2013,33(5):73-80.
[2] DEB S,POU K R J.Areview of withering in the processing of black tea[J].Journal of Biosystems Engineering,2016,41(4):365-372.
[3] 王伟伟,江和源,江用文,等.红茶萎凋处理温湿度条件对PPO、POD及茶多酚和色素的影响[J].食品工业科技,2013,34(13):86-90.
[4] 陈维,祁丹丹,王雯雯,等.黄化变异对英红九号红茶香气的影响[J].现代食品科技,2018,34(10):237-245.
[5] 宋振硕,王丽丽,陈键,等.茶鲜叶萎凋过程中主要品质成分的动态变化[J].茶叶学报,2016,57(3):138-141.
[6] ULLAH M R,ROY P C.Effect of withering on the polyphenol oxidase level in the tea leaf[J].Journal of the Science of Food & Agriculture,2010,33(5):492-495.
[7] 刘鸿年,刘发敏.茶鲜叶萎凋中苯丙氨酸解氨酶活性的研究[J].西南农业大学学报,1990(4):375-378.
[8] 夏涛,童启庆.冷冻萎凋对茶叶多酚氧化酶和β-葡萄糖苷酶活性的影响初探[J].浙江大学学报(农业与生命科学版),1997(1):108-110.
[9] 滑金杰,袁海波,江用文,等.萎凋通氧量对鲜叶品质生化成分和酶活性动态变化规律的影响[J].中国食品学报,2016,16(4):72-79.
[10] 乔小燕,吴华玲,韩雪文,等.仁化白毛茶生化成分与成品白茶品质的相关性研究[J].核农学报,2015,29(12):2 327-2 333.
[11] 唐仕荣,宋慧,蒋永红,等.茶氨酸的HPLC快速检测[J].中国食品添加剂,2006(4):160-163.
[12] ARNON D I.Copper enzymes in isolated chloroplasts polyphenoloxidase in Beta vulgaris[J].Plant Physiology,1949,24(1):1-15.
[13] 乔小燕,操君喜,黄华林,等.茶小绿叶蝉危害对金萱红茶挥发性成分的影响[J].现代食品科技,2018,34(9):228-234,243.
[14] JABEEN S,ALAM S,SALEEM M,et al.Withering timings affect the total free amino acids and mineral contents of tea leaves during black tea manufacturing[J].Arabian Journal of Chemistry,2019,8(12):2 411-2 417.
[15] DEV CHOUDHARY M N,BAJAJ K L.Biochemical changes during withering of tea shoots[J].Two Bud,1980,27:13-16.
[16] SARI F,VELIOGLU Y S.Changes in theanine and caffeine contents of black tea with different rolling methods and processing stages[J].European Food Research & Technology,2013,237(2):229-236.
[17] TOMLINS K I,MASHINGAIDZE A.Influence of withering,including leaf handling,on the manufacturing and quality of black teas:A review[J].Food Chemistry,1997,60(4):573-580.
[18] YE Yu-long,YAN Jing-na,CUI Ji-lai,et al.Dynamic changes in amino acids,catechins,caffeine and gallic acid in green tea during withering[J].Journal of Food Composition & Analysis,2018,66:98-108.
[19] 王丽丽,宋振硕,陈键,等.茶鲜叶萎凋过程中儿茶素和生物碱的动态变化规律[J].福建农业学报,2015(9):856-862.
[20] 丰金玉,刘昆言,秦昱,等.红茶加工中多酚氧化酶、过氧化物酶和β-葡萄糖苷酶活性变化[J].农学学报,2014,4(11):96-99.
[21] 龚志华,刘昆言,刘林峰,等.红条茶加工过程中茶黄素组分的动态变化[J].茶叶通讯,2016,43(2):19-23.
[22] ANANINGSIH V K,SHARMA A,ZHOU Wei-biao.Green tea catechins during food processing and storage:A review on stability and detection[J].Food Research International,2013,50(2):469-479.
[23] WICKREMASINGHE R L.Advances in food research[M].New York:Academic Press,1975:229-286.
[24] HAZARIKA M,MAHANTAP K.Some studies on carotenoids and their degradation in black tea manufacture[J].Journal of the Science of Food and Agriculture,1983,34:1 390-1 396.
[25] 萧伟祥,吴雪原,万玉霞.茶叶中叶绿素及其在制茶过程中的变化[J].中国茶叶,1989(1):8-10.
[26] 夏涛,童启庆.红茶萎凋发酵中β-葡萄糖苷酶的活性变化[J].茶叶科学,1996,16(1):63-66.

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