The Effect of Initial Microwave Drying on Black Tea Quality

CUI Lidan; ZHANG Xianglin; XIANG Xi; LI Lanlan; QU Qingyun; XU Yangyang; WANG Jiguo; LIU Feng; GONG Zhihua; XIAO Wenjun

doi:10.13305/j.cnki.jts.2021.03.007

Journal of Tea Science >

2021 , Vol. 41 >Issue 3: 406 - 418

DOI: https://doi.org/10.13305/j.cnki.jts.2021.03.007

Research Paper

The Effect of Initial Microwave Drying on Black Tea Quality

CUI Lidan ,
ZHANG Xianglin ,
XIANG Xi ,
LI Lanlan ,
QU Qingyun ,
XU Yangyang ,
WANG Jiguo ,
LIU Feng ,
GONG Zhihua ,
XIAO Wenjun

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1. Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha 410128, China;
2. National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, Hunan Agricultural University, Changsha 410128, China;
3. Co-Innovation Center of Education Ministry for Utilization of Botanical Functional Ingredients, Changsha 410128, China;
4. The Impression of Shimen Tea Ancestor Taiping Tea Professional Cooperative, Shimen 415300, China

Received date: 2020-11-09

Revised date: 2021-01-10

Online published: 2021-06-15

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Abstract

Flushes of two leaves and a bud of tea cultivar ‘Bixiangzao’ were picked during late summer and early autumn as raw material. During the black tea processing, initial microwave drying was adopted instead of conventional initial air drying. Seventeen processing groups were set up with independent variables of microwave density, time duration and piled leaf depth. Sensory quality, taste compounds and aroma compounds of the black tea were investigated and considered as quality criteria. The results show that compared with conventional initial air drying, the black tea processed with microwave power density of 600 W, 3 min, and piled leaf depth of 2 cm had the best sensory quality. Meanwhile, it showed a significant increase in the contents of theaflavins, thearubigins, catechins, ester catechins, EGCG, amino acids, caffeine and soluble sugar (P<0.05), while presented a significant decrease in the contents of tea polyphenols and theabrowmines (P<0.05). The number of aroma compounds increased from 43 to 50. The relative contents of floral and fruit scent compounds such as linalool and phenylethanol increased significantly (P<0.05). Furthermore, several novel sweet and flower scent compounds including (Z)-3,7-dimethyl-2,6-octadien-1-ol, 2,6,6-trimethyl-1,3-cyclohexadiene-1-formaldehyde, 2,6,6-trimethyl-1-cyclohexene-1-formaldehyde, and eugenol were identified. In conclusion, the initial microwave drying benefits the quality of black tea.

Key words： tea processing; black tea; initial microwave drying; sensory quality; biochemical components

Cite this article

CUI Lidan , ZHANG Xianglin , XIANG Xi , LI Lanlan , QU Qingyun , XU Yangyang , WANG Jiguo , LIU Feng , GONG Zhihua , XIAO Wenjun . The Effect of Initial Microwave Drying on Black Tea Quality[J]. Journal of Tea Science, 2021 , 41(3) : 406 -418 . DOI: 10.13305/j.cnki.jts.2021.03.007

References

[1] 杜钰, 袁海波, 陈小强, 等. 红茶对胃肠道生理调节与疾病预防作用的研究进展[J]. 茶叶科学, 2017, 37(1): 10-16.
Du Y, Yuan H B, Chen X Q, et al.Research progress of black tea on the physiological regulation and disease prevention in gastrointestinal tract[J]. Journal of Tea Science, 2017, 37(1): 10-16.
[2] Zhang H, Qi R, Mine Y.The impact of oolong and black tea polyphenols on human health[J]. Food Bioscience, 2019, 29: 55-61.
[3] Collier P D, Bryce T, Mallows R, et al.The theaflavins of black tea[J]. Tetrahedron, 1973, 29(1): 125-142.
[4] 王近近, 袁海波, 滑金杰, 等. 足火工艺参数对工夫红茶热风干燥特性和品质的影响[J]. 农业工程学报, 2020, 36(10): 287-296.
Wang J J, Yuan H B, Hua J J, et al.Effects of second-drying process parameters on the hot-air drying characteristics and quality of congou black tea[J]. Transactions of the Chinese Society of Agricultural Engineering, 2020, 36(10): 287-296.
[5] 罗理勇, 曾亮, 李洪军. 川红工夫加工过程多酚类物质及其相关酶的变化规律[J]. 食品科学, 2015, 36(3): 57-62.
Luo L Y, Zeng L, Li H J.Changes in polyphenols and enzymes responsible for their formation during processing of Chuanhong Gongfu tea[J]. Food Science, 2015, 36(3): 57-62.
[6] 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, 113.
Feng J Y, Liu K Y, Qin Y, et al.Activity changes of polyphenol oxidase, peroxidase and β-Glycosidase in black tea processing[J]. Journal of Agriculture, 2014, 4(11): 96-99, 113.
[7] 王力, 林智, 吕海鹏, 等. 茶叶香气影响因子的研究进展[J]. 食品科学, 2010, 31(15): 300-305.
Wang L, Lin Z, Lv H P, et al.Research progress in affecting factors of tea aroma[J]. Food Science, 2010, 31(15): 300-305.
[8] 丁勇, 徐奕鼎, 王烨军, 等. 祁门红茶初制中萎凋与初烘工艺研究[J]. 中国农学通报, 2010, 26(9): 110-114.
Ding Y, Xu Y D, Wang Y J, et al.Study on withering and first drying technology at primary processing of Keemun black tea[J]. Chinese Agricultural Science Bulletin, 2010, 26(9): 110-114.
[9] 肖宏儒, 宋卫东, 朱志祥, 等. 茶叶微波加工技术的研究[J]. 农业机械学报, 2004(3): 175-178.
Xiao H R, Song W D, Zhu Z X, et al.Study on microwave processing technology of tea[J]. Journal of Agricultural Machinery, 2004(3): 175-178.
[10] 刘新, 金寿珍, 傅尚文, 等. 微波加热在茶叶加工中的应用[J]. 食品科学, 2002, 23(10): 72-75.
Liu X, Jin S Z, Fu S W, et al.Application of microwave heating in tea processing[J]. Food Science, 2002, 23(10): 72-75.
[11] 朱德文, 岳鹏翔, 袁弟顺. 不同杀青方法对绿茶品质的影响[J]. 农业工程学报, 2009, 25(8): 275-279.
Zhu D W, Yue P X, Yuan D S.Effects of different fixation methods on the quality of green tea[J]. Transactions of the Chinese Society of Agricultural Engineering, 2009, 25(8): 275-279.
[12] 钟萝. 茶叶品质理化分析[M]. 上海: 科学技术出版社, 1989.
Zhong L.Physicochemical analysis of tea quality [M]. Shanghai: Science and Technology Press, 1989.
[13] 滑金杰, 袁海波, 姚月凤, 等. 温度对茶发酵叶色泽及茶色素含量的影响[J]. 农业工程学报, 2018, 34(12): 300-308.
Hua J J, Yuan H B, Yao Y F, et al.Effect of temperature on color and tea pigment content of fermented tea leaves[J]. Transactions of the Chinese Society of Agricultural Engineering, 2018, 34(12): 300-308.
[14] 郭颖, 黄峻榕, 陈琦, 等. 茶叶中儿茶素类测定方法的优化[J]. 食品科学, 2016, 37(6): 137-141.
Guo Y, Huang J R, Chen Q, et al.Optimization of sample preparation and HPLC chromatographic conditions for the determination of catechins in tea[J]. Food Science, 2016, 37(6): 137-141.
[15] Eva V, Blanka L, Kateřina S, et al.Identification of volatile aroma compounds in processed cheese analogues based on different types of fat[J]. Chemical Papers, 2012, 66(10): 907-913.
[16] Chen H C, Chi H S, Lin L Y.Headspace solid-phase microextraction analysis of volatile components in Narcissus tazetta var. Chinensis Roem[J]. Molecules, 2013, 18(11): 13723-13734.
[17] Shi D L, Yuan S W, Chang W L, et al.Comparative analysis of Pu-erh and Fuzhuan teas by fully automatic headspace solid-phase microextraction coupled with gas chromatography-mass spectrometry and chemometric methods[J]. Journal of Agricultural and Food Chemistry, 2014, 62(8): 1810-1818.
[18] 吕世懂, 吴远双, 王晨, 等. 云南晒青红茶与烘青红茶香气成分对比[J]. 食品科学, 2016, 37(14): 62-67.
Lv S D, Wu Y S, Wang C, et al.Comparative study of volatile components in sun-dried and baked black teas in Yunnan province[J]. Food Science, 2016, 37(14): 62-67.
[19] Lv H P, Zhong Q S, Lin Z, et al.Aroma characterisation of Pu-erh tea using headspace-solid phase microextraction combined with GC/MS and GC-olfactometry[J]. Food Chemistry, 2012, 130(4): 1074-1081.
[20] Chao W, Chen X Z, Ya W K, et al.A comparative study of volatile components in Dianhong teas from fresh leaves of four tea cultivars by using chromatography-mass spectrometry, multivariate data analysis, and descriptive sensory analysis[J]. Food Research International, 2017, 100: 267-275.
[21] Pripdeevech P, Machan T.Fingerprint of volatile flavour constituents and antioxidant activities of teas from Thailand[J]. Food Chemistry, 2010, 125(2): 797-802.
[22] 黄浩, 余鹏辉, 赵熙, 等. 不同季节保靖黄金茶1号工夫红茶挥发性成分的HS-SPME-GC-MS分析[J]. 食品科学, 2020, 41(12): 188-196.
Huang H, Yu P H, Zhao X, et al.HS-SPME-GC-MS analysis of volatile components of Congou black tea processed from Baojing Huangjincha 1 from different harvesting seasons[J]. Food Science, 2020, 41(12): 188-196.
[23] 仇方方, 曲凤凤, 余志, 等. 微波和光波提香对工夫红茶品质的影响[J]. 中国茶叶加工, 2018(4): 48-52.
Qiu F F, Qu F F, Yu Z, et al.Effect of microwave and light-wave for aroma-improving on the quality of Congou black tea[J]. Chinese Tea Processing, 2018(4): 48-52.
[24] Qu F, Qiu F, Zhu X, et al.Effect of different drying methods on the sensory quality and chemical components of black tea[J]. LWT, 2018, 99: 112-118.
[25] 王华杰, 滑金杰, 江用文, 等. 足火热传递方式对工夫红茶品质成分及色泽、滋味的影响[J]. 食品科学, 2020, 41(15): 148-157.
Wang H J, Hua J J, Jiang Y W, et al.Effect of different heat transfer modes during secondary drying on quality components, color and taste of Congou black tea[J]. Food Science, 2020, 41(15): 148-157.
[26] 张凌云, 魏青, 吴颖, 等. 不同干燥方式对金牡丹乌龙茶品质的影响[J]. 现代食品科技, 2013, 29(8): 1916-1920.
Zhang L Y, Wei Q, Wu Y, et al.Effect of different drying technologies on qualities of Jinmudan oolong tea[J]. Modern Food Science and Technology, 2013, 29(8): 1916-1920.
[27] 刘飞, 王云, 张厅, 等. 红茶加工过程香气变化研究进展[J]. 茶叶科学, 2018, 38(1): 9-19.
Liu F, Wang Y, Zhang T, et al.Review on aroma change during black tea processing[J]. Journal of Tea Science, 2018, 38(1): 9-19.
[28] Wang K, Liu F, Liu Z, et al.Comparison of catechins and volatile compounds among different types of tea using high performance liquid chromatograph and gas chromatograph mass spectrometer[J]. International Journal of Food & Technology, 2011, 46(7): 1406-1412.
[29] Pang X, Qin Z, Zhao L, et al.Development of regression model to differentiate quality of black tea (Dianhong): correlate aroma properties with instrumental data using multiple linear regression analysis[J]. International Journal of Food Science & Technology, 2012, 47(11): 2372-2379.
[30] Scharbert S, Jezussek M, Hofmann T.Evaluation of the taste contribution of the theaflavins in black tea infusions using the taste activity concept[J]. European Food Research and Technology A, 2004, 218(5): 442-447.
[31] Dutta R, Stein A, Bhagat R M.Integrating satellite images and spectroscopy to measuring green and black tea quality[J]. Food Chemistry, 2011, 127(2): 866-874.
[32] Susanne S, Thomas H.Molecular definition of black tea taste by means of quantitative studies, taste reconstitution, and omission experiments[J]. Journal of Agricultural and Food Chemistry, 2005, 53(13): 5377-5384.
[33] 高明珠. 工夫红茶真空脉动干燥工艺研究[D]. 北京: 中国农业科学院, 2016.
Gao M Z.Study on vacuum pulsating drying technology of Gongfu black tea [D]. Beijing: Chinese Academy of Agricultural Sciences, 2016.
[34] 陈昌辉, 杜晓, 齐桂年. 工夫红茶主要内含成分与品质的相关性分析[J]. 食品科技, 2011, 36(9): 83-87.
Chen C H, Du X, Qi G N.The relativity analysis between the main components of congou black tea and its quality[J]. Food Science And Technology, 2011, 36(9): 83-87.
[35] 张娅楠, 欧伊伶, 覃丽, 等. 红茶中香气物质的形成及工艺对其影响的研究进展[J]. 食品工业科技, 2019, 40(11): 351-357.
Zhang Y N, Ou Y L, Qin L, et al.Research progress on the formation of aroma substances and its influence of processes in black tea[J]. Science and Technology of Food Industry, 2019, 40(11): 351-357.
[36] 任洪涛, 周斌, 方林江, 等. 云南红茶加工过程中香气成分的变化[J]. 食品与发酵工业, 2013, 39(3): 187-191.
Ren H T, Zhou B, Fang L J, et al.Changes of aroma components during the processing of Yunnan black tea[J]. Food and Fermentation Industry, 2013, 39(3):187-191.

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