Top Read Articles

Published in last 1 year |

In last 2 years |

In last 3 years |

All

Please wait a minute...


For Selected: Download Citations EndNote Reference Manager ProCite BibTeX RefWorks Toggle Thumbnails

Select

The Impact of Organic Fertilizer Replacement of Chemical Fertilizers on Yield and Quality of Tea Gardens in China REN Hailong, CHEN Feifan, TAN Qiling, HU Chengxiao, LI Jinxue, WANG Shaomei, LI Xiaojun, MENG Yuanduo, ZHAO Yingjie Journal of Tea Science    2024, 44 (4): 598-608.   DOI: 10.13305/j.cnki.jts.2024.04.005 Abstract （388）      PDF（pc） （1017KB）（317）       Knowledge map    Save In order to explore the effects of organic fertilizer replacement of chemical fertilizers on tea yield, quality, and soil physicochemical properties in China, relevant literature on organic fertilizer replacement of chemical fertilizers in tea gardens was collected both domestically and internationally. Meta analysis was used to quantitatively analyze the effects of organic fertilizer replacement of chemical fertilizers on tea yield, quality, and soil physicochemical properties in China under different organic substitution ratios, soil physicochemical properties and substitution years. The results show that compared with the application of chemical fertilizers alone, partial substitution of organic fertilizer can significantly improve tea yield, quality, and soil nutrient content in tea gardens. The organic substitution ratios, soil conditions, and substitution period are important factors that affect the effectiveness of organic substitution. When the organic substitution ratio was less than 25%, the yield increase effect was the best. When the organic substitution ratio was between 25% and 75%, the best effect was achieved in improving the quality of tea. When the organic substitution exceeded 75%, it would lead to a decrease in tea yield due to insufficient nutrient supply in the soil during the season. Organic substitution had a better effect on increasing tea yield when soil organic matter<20βg·kg-1, alkaline nitrogen<100βmg·kg-1, available phosphorus<5βmg·kg-1, and pH>4.5. When soil organic matter>20βg·kg-1, alkaline nitrogen>100βmg·kg-1, available phosphorus>20βmg·kg-1, available potassium>100βmg·kg-1, and pH<5.5, the tea quality improvement effect was better. There was a cumulative effect of organic fertilizer efficiency, and the longer the organic substitution period, the better the effect on improving tea yield and quality. Reference | Related Articles | Metrics

Select

Advances on Flavor Chemical Characteristics of Solarization Tea XIE Chenxin, ZHAO Feng, LIN Yu, CAI Liangsui, LIN Zhi, GUO Li Journal of Tea Science    2024, 44 (4): 554-564.   DOI: 10.13305/j.cnki.jts.2024.04.014 Abstract （381）      PDF（pc） （502KB）（435）       Knowledge map    Save Tea withering or drying with solarization is beneficial to save a lot of energy cost and contribute to the unique flavor formation. In this paper, the advances of solarization tea were reviewed from the aspects of flavor quality characteristics, flavor chemical characteristics, technical and environmental factors affecting their formation. Linalool, geranyl, 1-octene-3-ol and capric aldehyde are the key aroma components of solarization tea, among which 1-octene-3-ol and 1-octene-3-one may be related to sun exposure flavor. Reasonable use of environmental factors such as sunlight and air humidity is a basic requirement for processing high-quality solarization tea. On this basis, the development of technology upgrading and theoretical research for solarization tea was prospected from the technical, theoretical and industrial levels. Reference | Related Articles | Metrics

Select

An Empirical Study on the Increase in Purchase Intention of Novel-tea Beverage among Young Consumers: Based on the Perspective of Customer Perceived Value YAN Pengxiang, PENG Kang, CHEN Fuqiao, JIANG Renhua Journal of Tea Science    2024, 44 (6): 1023-1036.   DOI: 10.13305/j.cnki.jts.2024.06.009 Abstract （381）      PDF（pc） （415KB）（291）       Knowledge map    Save In recent years, the novel-tea beverage industry has developed rapidly, becoming the third largest form of tea consumption after traditional loose-leaf tea and fast-moving bottled tea. The rapid expansion has intensified competition within the industry, making it crucial to increase customers’ purchase intention and frequency for the long-term healthy development of the industry. This study constructed an analytical model for enhancing the purchase intention of young consumers of novel-tea beverage from the perspective of customer perceived value. Though empirical research based on 1 900 consumer survey data points, the study examined the impact of product innovation, scene experience and brand exposure on customers’ purchase intention. The findings are as follows: (1) Product innovation, scene experience and brand exposure all positively influence customers’ purchase intention. (2) Functional value, experiential value and emotional value enhance the effects of product innovation, scene experience and brand exposure on purchase intention. (3) Product innovation, scene experience and brand exposure all positively affect purchase frequency, though there is some discerpancy between purchase intention and actual purchase behavior. Notably, product innovation plays a significant role in translating purchase intention into actual purchase behavior. Based on these conclusions, it is suggested that novel-tea beverage companies should highlight the uniqueness of product innovation, build interesting scene experiences, and link brand exposure emotions in their operations. Reference | Related Articles | Metrics

Select

The Mechanism and Research Progress of Epigallocatechin Gallate in Improving Non-alcoholic Fatty Liver Disease CHEN Jiaxin, ZHANG Jinjia, ZUO Huiling, JIAO Yuhang, SHI Anhua Journal of Tea Science    2024, 44 (4): 543-553.   DOI: 10.13305/j.cnki.jts.2024.04.003 Abstract （378）      PDF（pc） （655KB）（435）       Knowledge map    Save The incidence of nonalcoholic fatty liver disease (NAFLD) is increasing year by year and there is no specific drug available. The active ingredient of green tea, epigallocatechin gallate (EGCG), has been widely proven to have a favorable ameliorative effect on NAFLD in the low dose range. Some of the mechanisms by which EGCG delays the development of NAFLD through anti-oxidative stress, anti-inflammation, inhibition of iron death, reduction of lipogenesis, up-regulation of autophagy, modulation of intestinal flora, and reduction of bile acid metabolism were summarized in this paper, so as to provide insights for in-depth research on improving NAFLD. Reference | Related Articles | Metrics

Select

Research Progress in the Residue Analysis and Risk Assessment of Chiral Pesticides in Tea HU Yue, NING Yating, LI Hongxia, LUO Fengjian, YIN Rongxiu, ZHANG Xinzhong Journal of Tea Science    2024, 44 (3): 363-385.   DOI: 10.13305/j.cnki.jts.2024.03.013 Abstract （360）      PDF（pc） （902KB）（474）       Knowledge map    Save Chiral pesticides have one or more enantiomers, and their biological activity, toxicity, environmental behavior, degradation and metabolism may be different. Tea, as one of the three major beverages, has attracted much attention in terms of quality and safety. However, more attention is currently paid to the total amount of pesticide racemate residues. With the development of analytical techniques, it is particularly crucial to fully understand the stereoselective behavior of the chiral pesticide enantiomer in tea, as well as to examine residue degradation in tea and to set the maximum residue limits for enantiomers. This would help to improve the efficacies of chiral pesticides and reduce their residues and toxicities to non-target organisms. In this paper, the current status of chiral pesticide separation and residue detection technology in tea were reviewed, such as liquid chromatography, gas chromatography and supercritical fluid chromatography. In addition, it provided a summary of the residue degradation behaviors and risk assessment of chiral pesticide enantiomers in tea, which would be useful as a guide for further in-depth studies on chiral pesticide enantiomers in tea. Reference | Related Articles | Metrics

Select

Analysis of the Regurgitation Effect of New Tea Beverage Consumption Intention on Traditional Tea Consumption ZHANG Yi, HU Linying, YI Xiaoyun, CHEN Fuqiao, JIANG Aiqin Journal of Tea Science    2024, 44 (5): 853-868.   DOI: 10.13305/j.cnki.jts.2024.05.004 Abstract （332）      PDF（pc） （617KB）（311）       Knowledge map    Save To a certain extent, new tea beverage is the product of innovation and development based on traditional tea. China's long history of tea drinking provides a wide space for the new tea beverage market. The rich flavor of traditional tea as well as its inclusiveness become the main means of innovation for new tea beverage. Will new tea beverage consumption in turn affect traditional tea consumption? In this research, a theoretical model of new tea beverage consumption influencing traditional tea consumption was established, and the regurgitation mechanism was revealed. Then, using the new tea beverage research data from the Tea Research Institute of the Chinese Academy of Agricultural Sciences, it empirically examined the influence of new tea beverage consumption on traditional tea consumption. This research finds that there is a regurgitation effect of new tea beverage consumption on traditional tea consumption. The mechanism analysis shows that consuming new tea beverage can make consumers develop a traceability psychology and accumulate certain knowledge related to tea, thus promoting consumers' traditional tea consumption intention. The heterogeneity analysis shows that the effects of milk tea series and cheese-foam tea series are more prominent. Young groups with higher health consciousness are more likely to be influenced. The research conclusion helps to understand the ways of cultivating tea consumers through new tea beverage, and also has reference significance for expanding our country's tea consumption. Reference | Related Articles | Metrics

Select

Effects of Different Temperature Hot Air Withering on Withered Leaves and Tea Quality of Black Tea ZHANG Xianglin, LING Zhihui, HU Weixia, XIANG Chunhui, CUI Lidan, XU Wei, XIAO Wenjun Journal of Tea Science    2024, 44 (3): 483-492.   DOI: 10.13305/j.cnki.jts.2024.03.007 Abstract （302）      PDF（pc） （356KB）（420）       Knowledge map    Save Based on the traditional black tea processing technology, the hot air withering process was used to replace the traditional indoor natural withering process on the basis of the traditional black tea processing technology. The effects of four hot air withering processes of 35 ℃, 45 ℃, 55 ℃ and 65 ℃ on the quality of summer and autumn black tea were studied and analyzed from three aspects of sensory quality, taste quality and aroma quality. The results show that compared with 25 ℃ traditional indoor natural withering black tea, the comprehensive sensory quality of black tea processed by 45 ℃ hot air withering process was better. The color of dry tea was dark brown and moist, the soup color was red and bright, the taste was mellow and refreshing, and the quality characteristics was sweet aroma. At the same time, the contents of tea polyphenols, gallic acid, EGCG, theaflavins, thearubigins and the ratio of the sum contents of theaflavins and thearubigins to the content of theabrownins (TFRB) significantly increased (P<0.05), while the content of soluble sugar decreased significantly (P<0.05). The types of aroma quality components increased, among which alcohols accounted for the highest proportion (70.47%), and the relative contents of alcohols, ketones and esters increased significantly (P<0.05), while pyrroles and aldehydes decreased significantly (P<0.05). And the aroma components with flower and fruit aroma such as trans-3-hexenol, 2,3-dihydro-2,2,6-trimethylbenzaldehyde and α-ionone were detected. This shows that hot air withering with appropriate temperature is conducive to improving the quality of black tea, which can be applied to the production practice of improving the quality of black tea in summer and autumn. Reference | Related Articles | Metrics

Select

Review on the Formation Pathway of Kombucha Bacterial Cellulose and Its Application in Efficient Utilization of Tea Waste XU Qingqing, NIE Qing, LIU Zhusheng, GUO Qing, LIU Zhonghua, CAI Shuxian Journal of Tea Science    2024, 44 (5): 707-717.   DOI: 10.13305/j.cnki.jts.2024.05.001 Abstract （292）      PDF（pc） （831KB）（280）       Knowledge map    Save Tea waste and summer-autumn tea can be used to produce Kombucha and bacterial cellulose, helping to reduce environmental pollution and resource waste while developing high market value products. Bacterial cellulose, as a highly crystalline and sustainably renewable polysaccharide, has a wide range of potential applications in biomedicine, eco-friendly packaging, textiles, new energy batteries, skincare products, and other fields. This paper reviewed recent research on the applications of bacterial cellulose membranes, focusing on the effects of different fermentation environments and tea types on the quality of bacterial cellulose membranes. It confirmed that adjusting fermentation parameters can produce cellulose with specific crystalline structures. The paper also discussed the role of tea components in the formation of bacterial cellulose membranes and proposed new ideas for improving the yield and quality of Kombucha bacterial cellulose membranes. The health benefits of Kombucha bacterial cellulose membranes and their significant role in sustainable product development were emphasized. The paper highlighted the need for further research to promote their industrial application. Reference | Related Articles | Metrics

Select

Research Progress on the Application of Gas Chromatography-ion Mobility Spectrometry in the Field of Tea GAN Fangyuan, LIU Zhenping, FU Bingsheng, LONG Daoqi, PANG Kejing, JIANG Rong Journal of Tea Science    2024, 44 (4): 565-574.   DOI: 10.13305/j.cnki.jts.2024.04.001 Abstract （290）      PDF（pc） （484KB）（435）       Knowledge map    Save Tea is an important economic crop in traditional Chinese agriculture, with a long history and rich cultural connotation. The different parameters of tea origin, storage time and processing method determine the quality, nutritional value and market positioning. Known as a newly developed non-destructive testing technique, GC-IMS can analyze the volatile organic compounds (VOCs) of samples under normal pressure to characterize the differences between samples. This paper collected the existing literature data, reviewed the applications of GC-IMS technology in the study of kind differentiation, grade identification, origin identification, storage time determination and processing quality control of tea, and analyzed the current problems and future prospects of GC-IMS technology in the field of tea application, and provided theoretical reference for the flavor research, process optimization, quality analysis and quality monitoring of tea. Reference | Related Articles | Metrics

Select

Study on the Impact of Standards Differences in Pesticide Maximum Residue Limits on the Trade Efficiency of RCEP Members Exporting Tea from China: Based on the Stochastic Frontier Gravity Model HUO Zenghui, LIU Chang, ZHANG Mei, CHEN Fuqiao, LIU Zhonghua Journal of Tea Science    2024, 44 (3): 526-542.   DOI: 10.13305/j.cnki.jts.2024.03.006 Abstract （275）      PDF（pc） （962KB）（381）       Knowledge map    Save Currently, tea trade is facing challenges from technical trade barriers. This study used the standards differences in pesticide maximum residue limits (MRLs) as the entry point to construct The Heterogeneity Index of Trade (HIT) to quantify the specific differences in pesticide MRLs between countries. The stochastic frontier gravity model was used to study the impact of standards differences in pesticide MRLs on the trade efficiency of RCEP members exporting tea from China. The results show that there are differences in the pesticide MRLs standards between China and RCEP members, but overall there is a decreasing trend. The negative differences in pesticide MRLs standards between China and RCEP members will lead to a reduction in the trade efficiency of China's tea exports. The inhibitory effect path is manifested by significantly reducing tea export volume and export unit price. China's pesticide MRLs standard system should be further improved to align with international standards, promote mutual recognition of standards among countries in the RCEP region, and reduce the adverse effects of trade barriers. Reference | Related Articles | Metrics

Select

Historical Changes and Influencing Factors of Tea Producing Areas in the Yangtze River Basin DU Xiya, LIU Xinqiu, LU Yong Journal of Tea Science    2024, 44 (4): 694-706.   DOI: 10.13305/j.cnki.jts.2024.04.012 Abstract （272）      PDF（pc） （693KB）（736）       Knowledge map    Save The production, trade and the dissemination of tea culture in ancient China were mainly centered around the Yangtze River Basin. Research on the distribution of tea planting areas in the Yangtze River Basin and their influencing factors provides a crucial perspective for a thorough understanding of the historical and geographical development of tea. Based on the combing of ancient books, especially local records, combined with the research of modern scholars on tea producing areas in historical periods, this paper sorted out the historical evolution process of tea producing areas in the Yangtze River basin in detail. The study categorized these shifts into four stages and utilized ArcGIS technology to create distribution maps of tea-producing areas during each stage. The paper summarized the characteristics and patterns of tea-producing areas in the Yangtze River Basin, attempting to analyze prominent factors influencing the distribution of tea-producing areas in each stage. It reveals key features of the historical and geographical development of tea, providing valuable insights for a deeper understanding of tea production and the dissemination of tea culture in China. Reference | Related Articles | Metrics

Select

Study on the Synthetic Site of Caffeine in Different Etiolated Tea Germplasms ZHANG Yazhen, ZHONG Sitong, CHEN Zhihui, KONG Xiangrui, SHAN Ruiyang, ZHENG Shiqin, YU Wenquan, CHEN Changsong Journal of Tea Science    2024, 44 (4): 575-584.   DOI: 10.13305/j.cnki.jts.2024.04.011 Abstract （271）      PDF（pc） （2017KB）（335）       Knowledge map    Save As the main characteristic metabolite in tea plants, caffeine contributes to tea quality and flavor formation and is a natural functional component. Its function, distribution, biosynthetic pathway and related key genes in tea plants have been basically identified, but its synthetic site at subcellular level needs to be further clarified. In this study, ‘Baijiguan’ and its half-sib offsprings with different etiolated leaves were used as materials. The results of transmission electron microscopy show that the chloroplast structures in etiolated leaves were damaged or destroyed, which was closely related to the SPAD value and leaf phenotype. High performance liquid chromatography (HPLC) was used to determine the caffeine content. It was found that there was still a large amount of caffeine accumulation in etiolated leaves, even more than in normal green leaves. Then, the expression and location of CsTCS1, a key gene involved in caffeine synthesis, were studied by real-time PCR, in-situ hybridization and subcellular localization. It was shown that the expression level of CsTCS1 in different etiolated leaves varied obviously. But the expression site was basically consistent, mainly distributed in the nucleus and cytoplasm of palisade tissues. These results reveal that the synthetic site of caffeine at subcellular level in tea leaves were mainly nucleus and cytoplasm, but not chloroplasts. Reference | Related Articles | Metrics

Select

Research Progress on the Impact of Environmental Stresses on Tea Quality during the Withering Process YAN Duo, YU Penghui, GONG Yushun Journal of Tea Science    2025, 45 (1): 1-14.   DOI: 10.13305/j.cnki.jts.2025.01.003 Abstract （267）      PDF（pc） （530KB）（249）       Knowledge map    Save Withering is an important process for tea quality formation. Fresh tea leaves are subjected to a variety of environmental stresses such as water loss, temperature, light and mechanical damage during withering. Under these stresses, complex physiological and biochemical changes in leaves, which ultimately contribute to the formation of tea quality. This paper reviewed the effects of different environmental stresses on the formation of tea taste and aroma during the withering process. It mainly analyzed how different environmental stresses regulate the synthesis and metabolism of compounds in fresh tea leaves, and further explored their effects on the changes in cellular physical structure, enzymatic, and non-enzymatic chemical reactions in fresh tea leaves. This review provided theoretical supports for improving tea quality. Reference | Related Articles | Metrics

Select

Analysis of the Differences in Physical and Chemical Indicators of Tea Product Quality Standards in China LI Wenyan, ZHANG Lin, CHEN Liyan, ZHANG Yingbin, ZHOU Sujuan, HONG Yiwei, LIANG Sichen, SUN Hongfeng, CHEN Hongping Journal of Tea Science    2024, 44 (5): 843-852.   DOI: 10.13305/j.cnki.jts.2024.05.006 Abstract （262）      PDF（pc） （1092KB）（190）       Knowledge map    Save Physical and chemical components, as the key substance of tea quality, to a certain extent determine the flavor, quality characteristics, and quality level of tea, thus becoming the key indicator of Chinese tea product standards. China has set up a variety of standards related to tea products, which have certain common characteristics and specificities. However, at present, there is little research on the physical and chemical indicator characteristics of Chinese tea product standards. We collected 227 national, industry, and local standards for tea and related products in China, including 20 physical and chemical indicators. Due to differences in origin, raw materials, processing technology and harvesting time, there is some variability in the requirements of physical and chemical indicators among different tea standards, but the direction of quality requirements is consistent. The number of green tea standards, as well as their physical and chemical index parameters are the most numerous and most demanding. The requirements of national standards for tea are generally lower than those of industry or local standards. Compared with national basic tea product standards, geographical indications for tea products are generally higher in terms of physical and chemical index requirements. This study provided a reference for the construction and improvement of the product quality standard system of tea products in China. Reference | Related Articles | Metrics

Select

Study on the Differences of Volatile Components in Jingshan Tea from Different Tea Cultivars HOU Zhiwei, LÜ Yongming, MA Kuan, ZHANG Huiyuan, GU Zhe, ZHANG Ran, LI Le, JIN Yugu, SU Zhucheng, CHEN Hongping Journal of Tea Science    2024, 44 (5): 747-762.   DOI: 10.13305/j.cnki.jts.20240824.001 Abstract （259）      PDF（pc） （3993KB）（302）       Knowledge map    Save To investigate the differences of volatile components in Jingshan tea from different tea cultivars, the stir bar sorptive extraction gas chromatography-mass spectrometry (SBSE-GC-MS), headspacegas chromatography-ion mobility spectrometry (HS-GC-IMS) were used to analyze the volatile components in Jingshan tea from five tea cultivars, including ‘Jingshan No. 1', ‘Jingshan No. 2', ‘Jiukeng', ‘Yingshuang' and ‘Cuifeng'. Firstly, a total of 93 volatile components were identified by GC-MS and 79 volatile components by GC-IMS. Secondly, principal component analysis (PCA) was used to reveal the differences in the volatile components of Jingshan tea from different tea cultivars. Finally, orthogonal partial least squares discriminant analysis (OPLS-DA) was used to determine the differential volatile components between different cultivars, and the relative odor activity value (ROAV) was used to further identify the key differential volatile components. The results show that 16 and 12 volatile compounds were identified as the key differential volatile compounds of different tea cultivars by SBSE-GC-MS and HS-GC-IMS respectively. Among them, the characteristic volatile components of ‘Jingshan No. 2' include 2-heptanol, methyl jasmonate, 2-methyl butanal, and 2-heptanone, which have clear fragrance characteristics and higher contents than other cultivars. The contents of methyl eugenol, hexanal, and (Z)-3-hexen-1-ol in ‘Jingshan No. 1' were relatively rich. The contents of oxidized limonene and pentanal in ‘Jiukeng' were relatively higher. The sensory evaluation results indicate that ‘Jingshan No. 1', ‘Cuifeng' and ‘Jingshan No. 2' had higher aroma scores. This study revealed that the characteristic volatile compounds in Jingshan tea from different tea cultivars have significant differences, which provided a theoretical basis for the selection of high-quality raw materials in Jingshan tea production, and had important value for achieving precise processing and targeted quality control of high-quality Jingshan tea. Reference | Related Articles | Metrics

Select

Quality Evaluation of Huoshan Huangya from the Perspective of Consumers JIANG Qing, QIU Tong, ZHAO Lei, ZHAO Xiaoyi, ZHANG Ying, CHEN Yingqi, GAN Shiya, DAI Qianying Journal of Tea Science    2024, 44 (4): 655-664.   DOI: 10.13305/j.cnki.jts.2024.04.004 Abstract （239）      PDF（pc） （1474KB）（197）       Knowledge map    Save Huoshan huangya of Anhui is commonly made from tea cultivars ‘Huoshan-jinjizhong’ and ‘Shuchazao’, with the processing methods of yellow tea and green tea. This study dealt with consumer preferences and variation of taste intensity for different cultivars and processing of Huoshan huangya using the Preferential attribute elicitation (PAE) method and Time-intensity (TI) method. In the PAE test, after the evaluators reached an agreement on the generated attributes, they ranked and assigned the intensity of sensory attributes according to the importance of their influence on preferences. The results show that the taste rank sum (115) > aroma rank sum (81) > appearance rank sum (44), and all consumers commonly selected the important descriptors: sweet aftertaste, flowery aroma and tippy. In the TI test, five descriptors were selected based on the geometric mean M value: sweet aftertaste, mellow, bitter, fresh, and astringent. Descriptors of sweet and fresh of yellow tea made from the tea cultivar ‘Huoshan-jinjizhong’ were higher than that of green tea, and descriptors of mellow, bitter, astringent were lower than those of green tea. Teas made from ‘Shuchazao’ showed the opposite trend. This study applied PAE and TI methods to clarify the important characteristics of Huoshan huangya, by observing the dynamic sensory changes of Huoshan huangya with different cultivars and different processing methods, to propose yellow tea made from ‘Huoshan-jinjizhong’ and green tea made from ‘Shuchazao’ were more suitable from the perspective of consumers. This paper scientifically guided yellow tea enterprises to organize production and sales according to local conditions. Reference | Related Articles | Metrics

Select

The Aroma Change of the Enzymatic Processing Stage of Beauty Tea in Different Withering Methods DING Fengjiao, YUAN Yuwei, LI Yuanchao, LIN Jinlong, YAN Jiawei, LI Pengchun, JIN Shan Journal of Tea Science    2024, 44 (3): 469-482.   DOI: 10.13305/j.cnki.jts.2024.03.008 Abstract （236）      PDF（pc） （1821KB）（445）       Knowledge map    Save To investigate the aroma changes between the natural withering indoors and sunlight withering outdoors during the enzymatic processing stage of beauty tea, the volatiles collected in the process samples of beauty tea during the enzymatic processing stage were analyzed by gas chromatography-mass spectrometry (GC-MS). Orthogonal partial least squares-discriminant analysis (OPLS-DA) was used to screen for differential volatiles. The results show that the differential volatiles of beauty teas from the two withering methods were similar at different stages of processing, in which the contents of N-hexanol, trans-2-hexen-1-ol, cis-3-hexen-1-ol, geraniol, hexyl isovalerate, cis-3-hexenyl butyrate, hexyl butyrate, N-butyrate (trans-2-hexenyl) ester, linalool oxy-furan-type, and linalool increased with the processing, which was the material basis for the formation of the aroma quality of Beauty Tea. While the contents of 2-hexenal, (E)-2-hexenyl-2-methylbutyrate, (E)-3-hex-enyl butyrate, ethyl caproate, and ethyl acetate-leaf alcohol ester declined continuously with the processing. The results of volatile determination show that there was no significant difference in the types of volatile components in the processing stage of beauty tea between the two withering methods, but mainly in the content, and most of the volatile components were more abundant in the outdoor sunlight withering beauty tea. This study aimed to explore the aroma changing rule of beauty tea during the enzymatic processing stage, in order to provide a theoretical basis for the optimization of beauty tea processing technology, and to improve the flavor quality and economic value of beauty tea. Reference | Related Articles | Metrics

Select

Carbonylation Modification of Epicatechin and Its Activities of UV Absorption and Antioxidant LEI Xiang, ZHANG Minfeng, LIN Hui, WANG Lili, ZHENG Deyong Journal of Tea Science    2024, 44 (3): 493-500.   DOI: 10.13305/j.cnki.jts.2024.03.002 Abstract （232）      PDF（pc） （359KB）（289）       Knowledge map    Save In order to enhance the UV absorption characteristic of epicatechin derivatives and improve their solubility in non-polar solvents such as oils and fats, 2,2'-di(p-hydroxybenzocarbonyl)-epicatechin was synthesized from epicatechin and p-hydroxybenzoic acid using methane sulfonic acid as solvent and catalyst. The target products were separated by column chromatography, and the purity was verified by high performance liquid chromatography (HPLC), and the structure of the target products were verified by UV-vis, FT-IR, 1H NMR, 13C NMR, LC-MS spectroscopy. The UV absorption characteristic of 2,2'-di(p-hydroxybenzocarbonyl)-epicatechin and its ability to scavenge ABTS+·, DPPH· and O2-· were evaluated. The results show that the synthesized 2,2'-di(p-hydroxybenzocarbonyl)-epicatechin had similar UV absorption and comparable molar absorptivity to OMC, the commonly used UV absorber, and is expected to be an excellent UV absorber in the UVB band. 2,2'-di(p-hydroxybenzocarbonyl)-epicatechin had good antioxidant activity in vitro, and its antioxidant capacity in vitro was higher than that of VC and slightly lower than that of epicatechin, which is expected to be used for cosmetic applications. Reference | Related Articles | Metrics

Select

Determination of Afidopyropen and Metabolite M440I007 in Tea Tissues by Modified QuEChERS Coupled with Ultra-high Performance Liquid Chromatography-Tandem Mass Spectrometry QIN Yujie, GUO Mingming, CHEN Yongjing, ZHOU Li Journal of Tea Science    2024, 44 (3): 515-525.   DOI: 10.13305/j.cnki.jts.2024.03.010 Abstract （232）      PDF（pc） （573KB）（289）       Knowledge map    Save Afidopyropen, a novel biorational insecticide, was registered in China in 2023 for the control of tea leafhoppers in tea plantation. In this study, an analytical method was developed for the determination of afidopyropen and its metabolite M440I007 in tea tissues by a modified QuEChERS method combined with ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Roots, stems and leaves of tea plants were extracted by water and acetonitrile, and purified with primary secondary amine (PSA), hydroxylated multi-walled carbon nanotubes (MWCNT-OH) and graphitized carbon black (GCB). The target compounds were determined by UPLC-MS/MS in multiple reaction monitoring (MRM) mode, and quantified by external standard method with matrix-matched standard curve. Both targets display excellent linearity (R2>0.999 5) in the range of 0.002-5.000 mg·L-1. The recoveries of both compounds at the spiked levels of 0.005-2.000 mg·kg-1 ranged from 78.3% to 106.0% with the relative standard deviations (RSD) ≤ 12.85%. The limits of quantification (LOQs) and detection (LODs) of the method were 0.005 mg·kg-1and 0.002 mg·kg-1, respectively. The developed method was applied to detect afidopyrofen and M440I007 in tea seedling tissues cultured in soil treated with afidopyropen in a pot experiment for 7 days. The results show that the distribution of afidopyropen in the tissues was roots (0.102 mg·kg-1) > stems (0.078 mg·kg-1) > leaves (0.007 mg·kg-1). The translocation factors, TFroot-stem and TFstem-leaf, were both less than 1, and the residue levels of the metabolite M440I007 were below the LOQ. The method established in this study is low-cost, accurate and sensitive, which can serve as a technical basis for further research on the uptake and transport behaviors of afidopyropen and M440I007 in tea plants. Reference | Related Articles | Metrics

Select

Identification and Tissue Expression Analysis of Sucrose Transporter (SUT) Gene Family in Camellia sinensis LUO Wei, ZHANG Jiaqi, YANG Ni, HU Zhihang, HAO Jiannan, LIU Hui, TAN Shanshan, ZHUANG Jing Journal of Tea Science    2024, 44 (4): 585-597.   DOI: 10.13305/j.cnki.jts.2024.04.002 Abstract （231）      PDF（pc） （2445KB）（346）       Knowledge map    Save Sucrose transporters (SUTs), the main sucrose carriers, consume energy to transport and load sucrose, which play a key role in the transport of plant photosynthetic products from source to sink. In this study, seven members of CsSUTs family were identified from Camellia sinensis ‘Shuchazao’ by bioinformatics analysis. Their physical and chemical properties, gene structure, subcellular localization, evolutionary relationship and cis-acting elements were analyzed. The identified CsSUT proteins, containing a conserved MFS-2 domain, are closely related to AtSUC proteins in Arabidopsis thaliana, which are clustered in SUTⅠ, Ⅱ and Ⅳ. AtSUC proteins of Arabidopsis thaliana were used as a model in the STRING online website to speculate that there might be a direct interaction between CsSUT proteins and SWEET, SUS and STP proteins. Analysis of the promoter regions of the CsSUT family genes in tea plants reveals that there were masses of cis-acting elements related to hormone response, abiotic stress, and plant growth and development. It is speculated that these promoters may be regulated by plant hormones, stress and other factors, thus affecting the growth and development of tea plants. There were differences in the expression patterns of CsSUT family genes in C. sinensis ‘Longjing 43’ and C. sinensis ‘Shuchazao’. CsSUT6 was highly expressed in flowers, suggesting that it may contribute to the supply, storage and distribution of sucrose in floral organs. CsSUT1 and CsSUT5 were highly expressed in various organs of tea plants, indicating that they may synergistically participate in the process of sucrose loading in ‘ source’ leaves and unloading in ‘sink’ organs. Reference | Related Articles | Metrics