FOOD RESEARCH INTERNATIONAL
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2019
·
IF 3.579
Zhihui Feng,Ming Li,Yifan Li,Xiaochun Wan,Xiaogen Yang
The orchid-like odor of a tea infusion is regarded as a noble aroma and an essential sensory attribute for certain premium teas. Such tea leaves are difficult to make and the quality is not always reproducible. This study is focused on the molecular sensory basis of the orchid-like attribute in tea brews. The aroma is defined as jasmine- and magnolia-like floral notes with a fruity undertone and found to be closely related to the flower scent of the orchid Cymbidium faberi Rolfe (hui lan) by a sensory panel. Gas chromatography mass spectrometry (GC-MS) and aroma extract dilution analysis revealed that the key contributor was (Z)-methyl epijasmonate (epi-MeJA), which was also one of the main odor compounds in the flower scent of C. faberi and in the infusions of selected high-quality teas. Concentration of epi-MeJA was ranging from 0.09 to 2.2 µg/g in the oolong and green tea leaves.
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JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES
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2019
·
IF 1.463
Kai Chen,Mao-Xi Huang,Qing-Cai Shi,Xin Xie,Lin-Hong Jin,Wei-Ming Xu,Xiang-Yang Li
Pheromones can be used as leafhopper attractants. However, commercial pheromone products, such as the Ingle lure, have certain limitations, including poor persistence in the field. In this study, (E)-2-hexenal, (Z)-3-hexen-1-ol, (Z)-3-hexenyl acetate, (E)-ocimene, linalool, and geraniol were selected and behaviorally tested as potential leafhopper attractants. Y-tube olfactometer tests showed that the C2 formulation was more effective than other formulations. In tea field trials, the number of leafhoppers caught by sticky board traps baited with C2 lures was greater than that caught by treatment. The number of leafhoppers attracted by the C2 lures was greater than that attracted by the commercial Ingle lures. Additionally, the total amount of active C2 components on lures was greater than that of the active components on the lure after 14 days. Thus, the results indicated that the C2 formulation may attract leafhoppers and have a greater persistence than other formulations in tea field.
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INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Tingwei Chen,Chuanqing Huang,Chuanzhen Ye,Lu Li,Zeyu Liu,Wenqian Huang,Lin Lin,Changzhu Li,Yong Ye
The controlled release packaging system has been considered as an efficient strategy for drug delivery, but the contradiction of instability and release difficulty after encapsulation of natural active compound is unsolved. In this research, tea saponin was embedded into the cavity of β-cyclodextrin polymer (β-CDP) to form a stable inclusion complex and then successfully constructed the nanofibers by electrospinning. The optimal polymer substrates (polyacrylonitrile, 0.1 g β-CDP, 0.03 g tea saponin , dendritic mesoporous silica nanoparticles (DMSNs) 3.75 wt% of the mass of PAN) were obtained to fabricate the TS/PAN@ β-CDP-DMSNs with a typical nanofiber structure with uniform diameter distribution and high porosity. The nanofiber exhibited a better thermal stability (270 °C), higher moisture resistance (water contact angle 126.4°) and relatively larger specific surface area. Results of the FTIR and XPS characterization indicate chemical interactions of TS/PAN@ β-CDP-DMSNs via van der Waals forces and hydrogen bonds. As a result, the tea saponin release efficiency increased from 69.30% of liposome to 81.16% of nanofiber at 36 h. Simultaneously, the antibacterial rates against Escherichia coli and Staphylococcus aureus were significantly improved compared with tea saponin and PAN@ β-CDP-DMSNs. This research provides a feasible strategy for the application of the drug delivery systems to both solve the stability and release efficiency of natural active compounds.
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Biomass Conversion and Biorefinery
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2023
·
IF 4
Zeng Xiang,Dai Huijia,Liu Bing,Wen Yao
In this study, the extraction process of Tieguanyin tea polyphenols was optimized and its hypoglycemic activity was tested. The response surface method was used to design the experiment to optimize the extraction process and explore the best extraction conditions. The extract was purified by AB-8 macroporous resin, and its hypoglycemic activity was studied by the inhibition rate of two enzymes (α-glucosidase and α-amylase). The optimum conditions of ultrasonic-assisted extraction of Tieguanyin tea polyphenols were as follows: material-to-liquid ratio of 40 mL/g, ultrasonic power of 240 W, and ultrasonic time of 30 min. The extraction rate of tea polyphenols was 13.82%, which was consistent with the predicted value of 13.78%. The purification experiment results showed that the purity of tea polyphenols was 50.62%. The IC 50 of Tieguanyin tea polyphenol extract on α-glucosidase and α-amylase was 1.93 × 10 −8 mg/mL and 7.65 × 10 −11 mg/mL, respectively, indicating that it could inhibit both of them. In this study, the optimum extraction process of Tieguanyin tea polyphenols was optimized and confirmed, and it was confirmed that Tieguanyin tea polyphenols had strong hypoglycemic activity.
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Inorganics
·
2023
·Vol. 11
·期 4
·148
·
IF 2.9
Yan Guo,Junpo Guo,Bo Li,Yun Zheng,Wen Lei,Jiangmin Jiang,Jincheng Xu,Jingjun Shen,Jielei Li,Huaiyu Shao
The application of organic electrode materials can make the whole cycle of the lithium battery operation effective for green sustainability. However, poor electronic conductivity and strong solubility in nonprotonic electrolytes limit the application of organic anodes. Here, a novel organic anode material, TP-Ni, was fabricated through the simple chelation of tea polyphenols with nickel ions. Benefiting from coordination bonds that alter the intrinsic microstructure of TPs and contribute to pseudocapacitive charging, the TP-Ni anode exhibits remarkable electrochemical properties, including a high specific capacity (1163 mAh g−1at 0.1 A g−1), superb rate capability, and extraordinary cycling stability (5.0 A g−1over 4000 cycles with a capacity retention of 87.8%). This work can provide guidance for the design and synthesis of new high-performance organic electrode materials in the future and help accelerate the process of organic electrode material applications.Keywords:organic anode;chelation reaction;tea polyphenol;lithium-ion batteries;high performance
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2019
·
IF 7.149
Jinxiu Lou,Wei Wang,Lizhong Zhu
Halobenzoquinones (HBQs) are frequently detected disinfection byproducts (DBPs) in drinking water with high toxicity and relevance to public health. In this study, we characterized the occurrence, formation, and oxidative stress of the HBQs in tea. 2,6-DCBQ and TetraC-1,2-BQ were identified in all prepared teas at total concentrations of 1.3–2.0 ng/L. 2,6-DCBQ originated from drinking water DBPs, while TetraC-1,2-BQ originated from tea leaves or were generated during tea polyphenol chlorination. HBQs in tea induced the formation of reactive oxygen species and semiquinone radicals, and the oxidative stress could be depleted by tea polyphenols, e.g., (−)-epigallocatechin gallate (EGCG). High-resolution mass spectrometry analysis indicated that the HBQs combined with EGCG and formed adducts at a ratio of 1:1 or 2:1 with the binding sites on the A ring and B ring of EGCG. The viability of HepG2 cells exposed to 50 μM 2,6-DCBQ was increased from 20.0% to 65.2% when 50 μM of EGCG was added. These results demonstrated that various HBQs can occur in tea due to the HBQ DBPs in drinking water, the leachate from tea leaves, and the chlorination of tea polyphenols; furthermore, the oxidative stress and cellular toxicity induced by HBQs in tea could be decreased by tea polyphenols. This is the first study to report HBQs in tea, elucidate the sources of HBQs, and assess relevant health risks.
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Oxidative Medicine and Cellular Longevity
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2019
·
IF 4.868
Xiang Li,Si Chen,Jing-En Li,Ning Wang,Xin Liu,Qi An,Xi-Mei Ye,Zi-Tong Zhao,Meng Zhao,Yi Han,Ke-Hui Ouyang,Wen-Jun Wang
The study was designed to investigate the chemical composition and antioxidant activities of polysaccharides from Yingshan Cloud Mist Tea. The chemical composition of green tea polysaccharides (GTPS) was analyzed by Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscope (SEM), thermogravimetric (TGA), gas chromatograph (GC), and high-performance gel-permeation chromatography (HPGPC). Then, the antioxidant activities in vitro of GTPS, effects of GTPS on body weight, and the antioxidant activities in chickens were studied. The results showed that GTPS were composed of rhamnose (Rha), arabinose (Ara), xylose (Xyl), mannose (Man), glucose (Glu), and galactose (Gal) in a molar ratio of 11.4 : 26.1 : 1.9 : 3.0 : 30.7 : 26.8 and the average molecular weight was . Furthermore, GTPS exhibited obvious capacity of scavenging DPPH radical, hydroxyl radical, and superoxide radical and enhanced the ferric-reducing power in vitro. Last, GTPS significantly increased the body weight of chickens, enhanced the T-AOC, SOD, and GSH-Px level, and decreased the content of MDA in chickens. The results indicated that GTPS might be a kind of natural antioxidant, which had the potential application in feed industry.
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Pharmaceuticals
·
2024
·Vol. 17
·期 9
·1181
·
IF 4.3
Zeting Huang,Lanyue Zhang,Jie Xuan,Tiantian Zhao,Weihua Peng
Atopic dermatitis (AD) is a persistent and recurrent inflammatory skin condition with a genetic basis. However, the fundamental reasons and mechanisms behind this phenomenon remain incompletely understood. While tea extracts are known to reduce histamine-induced skin allergies and inflammation, the specific mechanisms by which various types of Chinese tea provide their protective effects are still not fully elucidated. In this study, a model of skin itching induced by histamine is used to explore the functions and mechanisms of three types of tea extract (Keemun black tea (HC), Hangzhou green tea (LC), and Fujian white tea (BC)) in alleviating histamine-induced dermatitis. The components of three tea extracts are identified by UPLC-Q-TOF-MS, and we found that their main components are alkaloids, fatty acyls, flavonoids, organic acids, and phenols. The inhibitory effects of three types of tea extract onEscherichia coli(E. coli) andStaphylococcus aureus(S. aureus) in skin injury are investigated by MIC and flow cytometry. The three types of tea extract have an inhibitory effect on the growth of bacterial flora, with HC showing the best inhibitory activity. The effect of the three types of tea extract on histamine-induced dermatitis is also evaluated. Furthermore, itchy skin experiments, HE staining, toluidine blue staining, and immunohistochemical staining of mouse skin tissues were performed to determine the variations of scratching, epidermal thickness, mast cell number, IL-1β, and NGF content after the administration of the tea extracts. The three types of tea extracts all alleviate and inhibit skin itching, epidermal hyperplasia, and allergic dermatitis. BC effectively alleviates epidermal hyperplasia caused by skin allergies, and LC significantly downregulates NGF. HC reduces histamine-induced mast cell infiltration and downregulates IL-1β to alleviate skin itching. Consequently, tea emerges a potent natural product that can inhibit the growth of skin wound bacterial flora and exhibit skin repair effects on histamine-induced allergic dermatitis.
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MOLECULES
·
2016
·Vol. 21
·期 10
·1345
·
IF 2.465
Meng Shi,Ying Nie,Xin-Qiang Zheng,Jian-Liang Lu,Yue-Rong Liang,Jian-Hui Ye
Ultraviolet B (UVB) photosensitivities of eight catechins were screened. In both water and ethanol, epicatechin (EC, 575 μM) and catechin (C, 575 μM) exhibited low photostabilities under 6 h UVB radiation with the generation of yellow photoproducts, while other catechins (epigallocatechin gallate, epigallocatechin, epicatechin gallate, gallocatechingallate, gallocatechin, catechin gallate) were relatively UVB-insensitive. Photoisomerization and photolysis were two important UVB-induced reactions to EC whereas photolysis was the dominant reaction for C. The influencing factors of time (2–10 h), solvent (water, ethanol) and substrate concentration (71.875–1150 μM) on UVB-induced chemical conversions of EC and C were investigated, and eight photoproducts were identified through ultra performance liquid chromatography-diode array detection-tandem mass spectrometry (UPLC-DAD-MS/MS) and1H nuclear magnetic resonance (1H-NMR analysis). Photolysis reaction involved two pathways, including radical reaction and photo-induced electron transfer reaction. The 2,2-diphenylpicrylhydrazyl (DPPH) scavenging abilities of eight catechins did not change upon 6 h UVB irradiation. EC and C are photosensitive catechins among eight catechins causing deep color.Keywords:photostability;catechins;photoisomerization;photolysis;photoproducts
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2013
·
IF 2.906
Lihua Jiang,Xiaojia Shen,Toshihiko Shoji,Tomomasa Kanda,Jiachun Zhou,Liming Zhao
Zijuan tea is a new cultivar produced in Yunnan province of China. Unlike most tea cultivars, Zijuan tea is anthocyanin-rich. The composition and antioxidant activities of anthocyanins of Zijuan tea were studied for the first time in this paper. Anthocyanins were extracted with acidified methanol and quantified as 707 ± 28 μg/g of dry weight (cyanidin-3-O-β-d-glucoside equivalent) by high-performance liquid chromatography (HPLC) analysis. Four anthocyanins were successfully identified after Amberlite XAD-7HP adsorption column chromatography and octadecyl silane (ODS) flash chromatography. Among the four, delphinidin-3-O-β-d-galactoside (1) and cyanidin-3-O-β-d-galactoside (2) were confirmed by liquid chromatography–electrospray ionization mass spectrometry (LC-ESI-MS) and HPLC. Delphinidin-3-O-β-d-(6-(E)-p-coumaroyl) galactopyranoside (3) and cyanidin-3-O-β-d-(6-(E)-p-coumaroyl) galactopyranoside (4) were characterized by the high-resolution time-of-flight-mass spectrometry (HRTOF-MS) and nuclear magnetic resonance (NMR) spectrometry. The antioxidant activities of compounds 3 and 4, which composed approximately 75% of the total anthocyanins content in HPLC analysis, were evaluated by DPPH and FRAP assays. Results showed that both had higher antioxidant activities than commercial antioxidants butylated hydroxytoluene (BHT) used as one of controls in these assays.
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Food & Function
·
2014
·Vol. 5
·期 7
·1520-1528
·
IF 2.907
Ye-wei Huang,Huan-huan Xu,Su-min Wang,Yi Zhao,Yu-min Huang,Run-bo Li,Xuan-jun Wang,Shu-mei Hao,Jun Sheng
Caffeine is present in a number of dietary sources consumed worldwide. Although its pharmacokinetics has been intensively explored, little is known about complexed caffeine (C-CAF) in aqueous extraction of fermented Pu-er tea. The major components of C-CAF are oxidative tea polyphenols (OTP) and caffeine. Furthermore, the C-CAF can be precipitated in low pH solution. After administering the same amount of total caffeine and comparing the peak level of plasma caffeine with the coffee (contains 0.11 ± 0.01% C-CAF) group, the results showed that the caffeine/OTP (contains 66.67 ± 0.02% C-CAF) group and the instant Pu-er tea (contains 23.18 ± 0.02% C-CAF) group were 33.39% and 25.86% lower, respectively. The concentration of the metabolites of caffeine supports the idea that the absorption of the C-CAF was inhibited in mice. Congruent with this result, the amount of caffeine detected in mice excrement showed that more caffeine was eliminated in the caffeine/OTP group and the Pu-er tea group. The locomotor activity tests of mice demonstrated that the stimulating effect of caffeine in caffeine/OTP and Pu-er tea was weaker than in coffee. Our findings demonstrate that caffeine can be combined with OTP and the absorption of C-CAF is inhibited in mice, thus decreasing the irritation effect of caffeine. This may also be developed as a slow release formulation of caffeine.
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Current Research in Food Science
·
2024
·
IF 6.2
Yufei Zhang,Yanyin Lu,Dandan Pan,Yanyan Zhang,Chen Zhang,Zexin Lin
Despite lignocellulose hindering the extraction of intracellular components, tea residue can serve as an excellent substrate for fungal fermentation owing to their lignocellulose-degrading abilities. Thus, the fermentation efficiencies of Lentinus edodes , Lentinus sajor-caju (Fr.) , Flammulina filiformis , Hericium erinaceus , Pleurotus pulmonarius , and Monascus kaoliang B6 were evaluated using tea residue as a medium. P. pulmonarius and L. sajor-caju (Fr.) exhibited the fastest growth rates, with colony radii of 33.1 and 28.5 mm, respectively. M. kaoliang B6 demonstrated substantial degradation abilities for cellulose, hemicellulose, and lignin, with decolorization radii of 12.2, 0.9, and 8.5 mm, respectively. After a 9-days liquid fermentation, M. kaoliang B6 achieved the highest conversion efficiency at 27.8%, attributed to its high cellulase (191 U∙mL −1 ) and lignin peroxidase (36.9 U∙L −1 ) activities. P. pulmonarius and L. sajor-caju (Fr.) showed lower conversion rates of 8.6% and 3.8%, despite having high hemicellulase activities (67.1 and 70.9 U∙mL −1 ). Fermentation by M. kaoliang B6 resulted in a reduction of protein and total sugar content in the tea residue by 174 and 192 mg g −1 , by which the mycelium's protein and total sugar content increased by 73 and 188 mg g −1 . Co-fermentation of these three strains had little effect on the improvement of conversion efficiency, which might owe to the antagonistic interactions among the strains. Generally, utilizing tea residue for edible fungi fermentation is a sustainable process for bio-waste treatment, enabling efficient nutrient conversion under mild conditions without adding chemicals.
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