Journal of Functional Foods
·
2023
·
IF 5.6
Feng Zhao,Xiaojuan Wang,Hui Liu,Jiang Qian
White tea is a kind of tea abundant in oligopeptides. The study aims to reveal the potential association between white tea oligopeptides and anti-inflammatory ability. Crude oligopeptide extracts of two subtype white tea (named BaiMudan and ShouMei) were prepared by removing known active substances including pigments, polyphenols, caffeine, polysaccharides, and free amino acids. Four abundant oligopeptides (LCAY, LLLSKKL, EVFAG, and ECDSCG) were identified through high-resolution mass spectrometry sequencing, and synthesized for anti-inflammation evaluation. In vitro experiments showed, expect there was no effect of EVFAG on TNF-α, the rests oligopeptides were all good at inhibit NO, IL-6, and TNF-α. In vivo experiments indicated a notable decrease in neutrophils of zebrafish yolk sac. Specifically, performance of LCAY was particularly outstanding, with its anti-inflammatory effect at 250 μg·mL −1 could exceed 100 μM dexamethasone. The prominent significance of this study is that it confirms white tea oligopeptides have a good anti-inflammatory activity.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2023
·
IF 6.1
Xiaofei Zhou,Bowei Zhang,Xiuli Zhao,Pixian Zhang,Jingting Guo,Yuan Zhuang,Shuo Wang
Hyperuricemia nephropathy (HN) is a metabolic disease characterized by tubular damage, tubulointerstitial fibrosis, and uric acid kidney stones and has been demonstrated to be associated with hyperuricemia. Coffee leaf tea is drunk as a functional beverage. However, its prevention effects on HN remain to be explored. This study showed that coffee leaf tea extracts (TE) contain 19 polyphenols, with a total content of 550.15 ± 27.58 mg GAE/g. TE decreased serum uric acid levels via inhibiting XOD activities and modulating the expression of urate transporters (GLUT9, OAT3, and ABCG2) in HN rats. TE prevented HN-induced liver and kidney damage and attenuated renal fibrosis. Moreover, it upregulated the abundance of SCFA-producing bacteria (Phascolarctobacterium, Alloprevotella, and Butyricicoccus) in the gut and reversed the amino acid-related metabolism disorder caused by HN. TE also decreased the circulating LPS and d-lactate levels and increased the fecal SCFA levels. This study supported the preliminary and indicative effect of coffee leaf tea in the prevention of hyperuricemia and HN.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Yanqun Xu,Jieqiong Wang,Ziqing Wu,Jing Huang,Zhenbiao Li,Jiayi Xu,Dan Long,Tian Ye,Gennv Wang,Junfeng Yin,Zisheng Luo,Yongquan Xu
Chinese Oolong tea is widely known for its intricate aroma. However, the degradation of volatile organic compounds (VOCs) poses significant challenges for the tea products. In this study, glutathione (GSH) has an excellent preservation effect on VOCs in both the VOCs extract and the tea infusion during storage, specifically slowing the degradation of hexanal (by 66.39% and 35.09%) and heptanal (by 67.46% and 63.50%). Additionally, the addition of GSH maintained higher levels of active ingredients in tea infusion, including epigallocatechin, procyanidin B1, glutamic acid, and L-(+)-arginine, with respective increases of 184.09, 2.92, 4.10, and 6.35 times. The sulfhydryl group of GSH formed a covalent bond with hexanal and 2-methylbutanal, therefore improving the stability of VOCs. These findings provided a valuable insight for developing effective VOC preservation techniques for water-based tea products.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2023
·
IF 6
Ya Liu,Yueying Zhang,Feiwu Long,Jinrong Bai,Yina Huang,Hong Gao
An abundance of low-salt sausages had emerged in the market as high salt intake may pose health risks to humans while their limited shelf-life becomes an urgent issue. In this study, tea-polyphenol/β-cyclodextrin/NaCl inclusion complexes (ICs) with thermal stability and better antioxidant activity were successfully prepared, their effects on the quality of low-salt sausages were investigated. The sausages were manufactured with the addition of ICs and NaCl with or without tea-polyphenols respectively, and they were stored at 25 °C for 28 days. IC group exhibited significantly lower oxidation of lipids and protein as the tea-polyphenols in the ICs could exert better antioxidant properties because of the special encapsulation structure. Besides, ICs could inhibit the growth of pathogens preventing the off-flavor. Also, ICs promoted the growth of P. pentosaceus with a strong antioxidant capacity in the sausage model, which maintained the existing pleasant flavor by preventing the oxidation of phenol and alcohol compounds. Meanwhile, ICs also accelerated the growth of Tetragenococcus , which contributed to flavor development at the later stages of fermentation by producing more esters. Hence, it was suggested that ICs could be utilized as a promising salt replacement to improve the quality of traditional Sichuan-style sausages.
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Materials Science & Engineering C-Materials for Biological Applications
·
2021
·
IF 7.328
Fei-Yu Wang,Yue Ren,Ri-Tong Lan,Wan-Qun Fu,Zi-Jian Chen,Shishu Huang,Rizwan M. Gul,Jing Wang,Jia-Zhuang Xu,Zhong-Ming Li
To avoid catastrophic bacterial infection in prosthesis failure, ultrahigh molecular weight polyethylene (UHMWPE), a common bearing material of artificial joints, has been formulated with antibiotics to eliminate bacteria locally at the implant site. However, the pressing issues regarding cytotoxic effects and evolution of drug resistant bacteria necessitates the development of bio-friendly bacteriostat with long bacteriostatic efficacy. Herein, tea polyphenol extracted from nature source was introduced in UHMWPE as a biogenic antimicrobial. Controlled antimicrobial activity was achieved by chemical crosslinking to regulate the release of the tea polyphenol. In addition, the crosslinking efficiency of UHMWPE blends with high loaded tea polyphenol was significantly improved in comparison to radiation crosslinking. The immobilized tea polyphenols also enhanced the oxidation stability of the UHMWPE, which is essential to prolong the service life in vivo and the storage time in vitro. The blends presented good biocompatibility, despite cell repellent on the highly crosslinked surface. Chemically crosslinked tea polyphenol/UHMWPE exhibited feasible properties for total joint implants, which is promising for clinical application.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
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IF 6.953
Haiyan Tian,Dong Xiang,Congfa Li
Herein, improvement of the stability of the water-in-oil-in-water (W/O/W) emulsions by addition of xanthan gum (XG)/locust bean gum (LBG) mixture in the inner water phase was aimed. The impact of XG/LBG mixture on the physical stability, microstructure and rheological properties of W/O/W emulsions was investigated. It was found that, compared with the control emulsions, the presence of XG/LBG mixture could improve the stability of W/O/W emulsions against coalescence. The tea polyphenols (TPPs) and XG/LBG mixture were simultaneously included in the internal aqueous phase of the double emulsion and stored at 25 and 40 °C in the dark for 28 d. The results showed that XG/LBG mixture not only had a protective role for TPPs encapsulated in the internal water phase, but also maintained more than 50% of the antioxidant capacity of TPPs.
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JOURNAL OF SOILS AND SEDIMENTS
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2021
·Vol. 21
·期 7
·2540-2550
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IF 3.308
Yang Han,Ye Zhi,Feng Fang,Xu Nan,Yang Jing,Yao Zihan,Li Zuling,Chen Jianping
Purpose Lead (Pb(II)) can be accumulated in soil and transferred to humans via the food chain. Therefore, it is essential to improve Pb(II) immobilization during soil remediation. Materials and methods Nanosized zero-valent iron (nZVI) from green tea extract (tea polyphenols, TPs) was successfully synthesized as an additive reductant. Further, the nZVI was supported on montmorillonite (Mont), resulting in a GT-nZVI@Mont composite characterized by multiple techniques, including Zeta potential, SEM, TEM, XRD, and XPS. Moreover, the transport experiments and the toxicity characteristic leaching procedure (TCLP) were conducted to identify the optimum conditions (i.e., GT-nZVI@Mont dosage, Pb(II) concentration, and pH) for the remediation. Results and discussion The experimental results showed that the enhanced transportability of GT-nZVI@Mont was about 40% more than that of GT-nZVI. Meanwhile, Pb(II) immobilization was increased at various pH values (especially under anoxic conditions). The Pb(II) immobilization capacity of GT-nZVI@Mont was 900.8 mg∙g -1 (per unit of Fe content), which was significantly higher than 530.1 mg∙g -1 per unit of Fe content in GT-nZVI. Such enhancement could be ascribed to the synergistic effects of the wrapped TP around the Fe 0 core and the Mont interlayer support, capable of protecting the Fe 0 surface from further oxidation. When GT-nZVI@Mont reacted with the Pb(II) in soil, TPs’ unwrapped coverage increased the reaction sites of Fe 0 cores for Pb(II) reduction and adsorption. Conclusions GT-nZVI@Mont with sufficient transportability provided efficient in situ remediation of Pb(II) in contaminated soil at a wide pH range.
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NANOTECHNOLOGY
·
2021
·Vol. 32
·期 27
·275707
·
IF 3.874
Songfa Qiu,Fan Gao,Zhijun Liang,Ximing Zhong,Li Hao,Huayao Chen,Xinhua Zhou,Hongjun Zhou
Tea tree oil, a natural antibacterial compound, cannot be used effectively because of its volatile nature. In this work, a biocompatible carrier was prepared and loaded with tea tree essential oil. The carrier was prepared via the electrostatic or chemical action of aminated mesoporous silica and sodium rosin for achieving a low volatilization rate of tea tree essential oil. A synergistic antibacterial effect was observed between sodium rosin and tea tree essential oil. This method utilized the positive charge of the amino group and the condensation reaction with the carboxyl group to achieve physical and chemical interactions with sodium rosin. Fourier Transform Infrared, Brunauer–Emmet–Teller, Zeta potential, SEM, TEM, and TG were performed to characterize the structure and properties of the samples. Compared to the electrostatic effect, the chemically modified system exhibited a longer sustained release, and the sustained release curve followed the Korsmeyer–Peppas release model. Also, the antibacterial properties of the chemically modified system exhibited better minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) respectively, the MIC and MBC for E. coli were 0.3 mg ml−1 and 0.6 mg ml−1 respectively, for S. aureus were 0.15 mg ml−1 and 0.3 mg ml−1 respectively. More strikingly, the sample also demonstrated long-term antibacterial performance. Therefore, this work provides a new way for the delivery of volatile antibacterial drugs to achieve sustained-release and long-lasting antibacterial effects.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2021
·
IF 5.279
Jing Zhang,Huiyan Jia,Biying Zhu,Junyao Li,Tianyuan Yang,Zheng-Zhu Zhang,Wei-Wei Deng
Methyl jasmonate (MeJA), a volatile organic compound, is a principal flowery aromatic compound in tea. During the processing of black tea, MeJA is produced by jasmonic acid carboxyl methyltransferase (JMT) of the jasmonic acid (JA) substrate, forming a specific floral fragrance. CsJMT was cloned from tea leaves; the three-dimensional structure of CsJMT was predicted. Enzyme activity was identified, and protein purification was investigated. Site-directed deletions revealed that N-10, S-22, and Q-25 residues in the beginning amino acids played a key functional role in enzyme activity. The expression patterns of CsJMT in tea organs differed; the highest expression of CsJMT was observed in the fermentation process of black tea. These results aid in further understanding the synthesis of MeJA during black tea processing, which is crucial for improving black tea quality using specific fragrances and could be applied to the aromatic compound regulation and tea breeding improvement in further studies.
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FOOD HYDROCOLLOIDS
·
2020
·
IF 7.053
Hui Xue,Meng Xu,Mingfu Liao,Wenxiang Luo,Guowen Zhang,Yonggang Tu,Yan Zhao
Tea and illicium verum are the main raw materials of marinated egg, and play an important role in the braising process. In this study, effects of tea and illicium verum braise on the physicochemical characteristics, microstructure, and molecular structure of the heat-induced egg white protein gel were investigated. Results indicated that, with an increased in tea and illicium verum concentration, all of the moisture content, T 2 and pH of tea treated boiled egg (TTBG) and illicium verum treated boiled egg (ITBG) showed a decreased trend. The water holding capacity of TTBG showed an increased first and then remained unchanged, while that of ITBG showed a rapid increased first and then decreased continually. The free sulfhydryl group and the hardness of both TTBG and ITBG showed an increased rapidly, and especially, the hardness of ITBG reached 2161.83 g at last. The surface hydrophobicity of TTBG showed an overall increased trend, while that of ITBG showed a decreased trend with a slight red-shift. Environmental scanning electron microscopy showed that TTBG gradually formed small compact aggregates, while ITBG gradually formed hypertrophy porous aggregates. Fourier transform infrared spectrometry displayed that the intramolecular β-sheets of both TTBG and ITBG showed a decreased trend, while the intermolecular β-sheets, α-helices, β-turn and intermolecular antiparallel β-sheets showed an increased trend. In general, both tea and illicium verum could improve the gel strength of boiled egg, but in a different way, and the effect of illicium verum braise on the strength of enhancing gel was better than that of tea.
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Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Xianglei He,Jialiang Li,Qingmei Meng,Ziyu Guo,Hao Zhang,Yurong Liu
The search for a cost-effective and mild activation method of preparing biochar with excellent adsorption capacity is advantageous to broaden its potential industrial application. Accordingly, tea waste was selected as a carbon source, and KHCO 3 and CH 3 COOK were selected as activators in the two-step sintering process because of their mildness and non-corrosive features. Three types of tea waste biochar was prepared, characterised and utilised for the adsorption of sulfadiazine (SDZ) from aqueous solutions. Benefiting from the activation, the specific surface areas of the tea waste biochar with the highest adsorption capacity described as KHCO 3 -TB-1:2 and CH 3 COOK-TB-1:2, were 717.636 and 648.415 m 2 /g, respectively, whereas the specific surface area of tea waste biochar that was not activated in the two-step sintering process was named TB was only 4.833 m 2 /g. Moreover, the tea waste biochar that was activated by KHCO 3 and CH 3 COOK developed a typical micro-/meso-/macro-hierarchical pore structure. Compared to TB without an adsorption capacity, the maximum adsorption capacities of KHCO 3 -TB-1:2 and CH 3 COOK-TB-1:2 for SDZ were 77.52 and 58.14 mg/g, respectively, at an initial concentration of 50 mg/L and pH = 10.97. The data of the batch-adsorption experiments fitted well with the pseudo-second-order kinetics and Langmuir model, thus suggesting that the adsorption process was dominated by chemical and monolayer adsorptions. The π–π electron donor–acceptor interaction, hydrogen bonding, and electrostatic interaction were the possible adsorption mechanisms. The activation of KHCO 3 and CH 3 COOK is a very promising method to limit equipment corrosion and prepare biochar for the removal of SDZ from aqueous solutions.
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Journal of Functional Foods
·
2020
·
IF 3.701
Jinglou Chen,Yongfang Lei,Min Liu
Cigarettes consumption is popular all over the world. In the meantime, green tea is widely accepted for their health benefits. Epigallocatechin-3-gallate (EGCG) is the most abundant catechin in green tea. This study aimed to investigate the effects of cigarette smoke (CS) exposure on human prostate cells and rat prostate, as well as the potential protective functions of EGCG. The results suggested that chronic CS exposure stimulated prostatic epithelial-mesenchymal transition (EMT), collagen deposition and fibrosis. Down-regulation of the Hedgehog (HH) signaling pathway helped to ameliorate CS-induced prostatic deficits. Meanwhile, EGCG could exhibit strong anti-fibrosis effects on prostate. Its underlying mechanisms were related to modulate EMT and decrease the activity of HH signal pathway.
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