ACS Omega
·
2020
·
IF 2.87
Xinliang Li,Guancheng Jiang,Xiulun Shen,Gongrang Li
Drilling fluids with poor filtration property are disadvantageous for well drilling, easily causing wellbore instability and formation collapse. This work reports the novel utilization of tea polyphenols (TPs) as a fluid loss additive in the bentonite–water-based drilling fluids (BT-WDFs). The influence of TP concentration and temperature on the filtration property of the fluids was described. The results showed that an increase in the TP concentration contributed to a decrease in fluid loss. Especially BT-WDFs added with 3.0 wt % TP exhibited a low fluid loss (less than or approximately 10 mL) at room temperature and high temperatures (∼150 °C), displaying better filtration property and temperature resistance than common fluid loss agents. Through the investigations on the viscosity, the particle size of TP/BT-WDFs, and micromorphology of filter cakes, the dispersion effect of TP was considered as the dominant factor for the filtration property of TP/BT-WDFs. TP molecules, containing many functional groups, could attach to the surface of bentonite platelets, improve the hydration of bentonite particles, and promote the dispersion of bentonite particles. At room temperature, TP facilitated the dispersion of hydrated bentonite. The existing “house-of-cards” structure was weakened, decreasing the particle size and viscosity of TP/BT-WDFs. At high temperature, bentonite dehydrated and aggregated, thereby increasing the particle size of bentonite particles, decreasing the viscosity of bentonite dispersion, and resulting in a high fluid loss. The addition of TP dispersed bentonite from face-to-face (FF) attraction to edge-to-face (EF) attraction, recovered the house-of-cards structure, and increased the viscosity of TP/BT-WDFs. Under the dispersion effect of TP, an appropriate grain composition of bentonite particles was formed and the pore throats were plugged to prevent the penetration of water. Finally, a compact and thin filter cake was built and the fluid loss was greatly reduced. The TP/BT-WDFs exhibited good filtration property. TP is a prospective candidate to be a high-performance and biodegradable fluid loss additive in well-drilling applications.
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高影响因子
WATER RESEARCH
·
2020
·
IF 9.13
Di Zhang,Feifei Wang,Youli Duan,Shenghua Chen,Aihong Zhang,Wenhai Chu
Disinfection by-products (DBPs) are associated with various adverse health effects. Diversiform advanced treatment processes have been applied for the control of DBPs, but DBPs can still be frequently detected in tap water . Tea-leaves can be made into popular beverage and is itself a porous bio-adsorbent. By simulating tea brewing process, this study evaluated the removal of DBPs from drinking water during the tea brewing process. Removal of four trihalomethanes (THMs) and four haloacetamides (HAMs) by different fermentation degree tea-leaves was investigated. Little DBPs were removed by unfermented and semi-fermented tea-leaves (i.e., Meitan turquoise bud and Dahongpao tea) with less than 5% removal of HAMs, whereas 40% HAMs can be removed by fermented tea (i.e., Jinjunmei tea and Shuixian tea). Tea soup is neutral and slightly acidic, so little DBP hydrolysis was observed under typical tea-leaf brewing process. DBPs were mainly removed by volatilization and adsorption during tea brewing. Removal difference caused by DBP volatilization is very small. The DBP removal difference of four kinds of tea-leaves may be caused by fermentation degree. The surface of unfermented Meitan turquoise bud had a smooth and regular morphology, whereas a rough, irregular, hollow and spongy surface of fermented tea (i.e., Jinjunmei and Shuixian tea) was observed. Generally, the higher the degree of tea fermentation, the more adsorption sites, and the more removal of DBPs. Finally, the model, which takes the DBP initial concentration, tea-leaf dose and brewing time into account, was established under the experimental conditions to predict the variation of DBP concentration during tea brewing, and suggestions for DBP removal were provided to reduce DBP exposure risk. The integrated toxic risk during tea brewing was also investigated, and about 30% integrated cytotoxicity and 26% genotoxicity was reduced during Jinjunmei and Shuixian tea-leaf brewing.
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高影响因子
JOURNAL OF FOOD SCIENCE
·
2020
·Vol. 85
·期 5
·1450-1461
·
IF 2.479
Xiaoqin Wang,Wencong Jia,Guoyin Lai,Lijuan Wang,María del Mar Contreras,Daomao Yang
Bound phenolic compounds have rarely been reported in vegetable oils and this may be due to little research about the extraction. Deep eutectic solvents (DESs), recently applied in the extraction of phenolic compounds as alternatives to organic solvents, were adopted in the extraction of free and bound phenolic compounds from tea seed oil in this work. First, the phenolic compounds were analyzed by ultra-high-performance liquid chromatography with quadrupole-time-of-flight and triple-quadrupole tandem mass spectrometry (UHPLC-Q-TOF-MS/MS) for characterization and UHPLC-QqQ-MS/MS for quantification and 25 phenolic compounds were found to exist in both free and bound forms. Then, DESs were screened for extraction of free and bound phenolic compounds from tea seed oil as the pretreatment for analysis and the results showed that hydrogen bond donors (HBDs) and temperature significantly affected the extraction efficiency of DESs. Finally, free phenolic compounds (83.91 µg/g) and bound phenolic compounds (25.71 µg/g), extracted by the DES with glycerol as HBD at 50 °C, were 51.0% and 93.2% higher than those extracted by methanol/water (60%, v/v), respectively. This work not only advanced the basic data of phenolic compounds in tea seed oil but also explored an efficient extraction method for scientific analysis of free and bound phenolic compounds.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2022
·
IF 4.52
Zhangfeng Zhao,Zhengwei Dai,Xuming Jiang,Liaoyuan Yu,Meijuan Hu,Jiyu Peng,Fei Zhou
Superfine grinding is a crucial step in green tea powder (GTP) processing. In this work, the time-resolved changes of physicochemical properties (physical properties, main active components, etc.) of GTPs were investigated, and ball milling time (BMT) for tea grinding was optimized. Variable importance in projection was used to evaluate the importance of modification of each physicochemical parameter on BMT, and a multi-objective fuzzy optimization model was used to obtain the optimal BMT. The BMT range was 2–30 h, and the results showed that BMT had a significant influence on the physicochemical properties of GTP. The mean particle size decreased from 257 to 10.6 μ m and the color became lighter as the BMT increased. The main active components decreased markedly when BMT increased form 18–24 h. Mean particle size and color difference dramatically correlated with BMT and could be described by a one-phase exponential decay function. The optimal BMT was 18 h and high quality GTP could be obtained under this condition with small particle size, bright green color and rich in theanine and total tea polyphenols (TTPs).
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Xiaoqiang Chen,Mengyang Li,Wendan Cao,Tianqi Fang,Wei Feng,Yu Han,Jun He,Yi Huang
Tea polysaccharide conjugates (TPC) and bovine serum albumin (BSA) have emulsifying properties, but they have certain shortcomings when used alone as emulsifiers. This study aimed to combine TPC and BSA to form a complex for applications to achieve the complementary advantages between them. The TPC/BSA complex was physicochemically characterized, and the results showed an improvement in its surface hydrophobicity. TPC/BSA emulsions with different concentrations (0.20–1.00 wt%) were prepared using TPC/BSA complex as the emulsifier. The effects of heat treatment, pH, and metal ions on the stability of TPC/BSA and BSA emulsions were investigated, and TPC/BSA emulsion systems loaded with epigallocatechin gallate (EGCG) and epigallocatechin (EGC) were constructed. TPC/BSA emulsion droplets were smaller than 1.00 wt% TPC emulsion droplets, and the particle size of 0.20 wt% TPC/BSA emulsion increased slightly during storage at 25 °C. Further, 0.20 wt% TPC/BSA emulsions became less stable after heat treatment, whereas the particle size of other concentrations did not change significantly after treatment at 70 ℃–90 °C. TPC/BSA emulsions were more stable at pH 6.0–9.0. Both were less affected by Na + , weakly affected by Ca 2+ than BSA emulsion, and significantly affected by Al 3+ . TPC/BSA emulsion had a good protection effect on EGCG and EGC. The presence of EGCG and EGC improved the stability of the emulsion system, which remained stable for 90 days.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Di Ye,Xinyu Wu,Zhewei Hu,Kehang Shi,Yuwen Lu,Qinchao Zhu,Lichang Xu,Lenan Zhuang,Yang Zhu,Chen Chen,Huanan Wang
Porcine diaphragmatic tendon enables a high-modulus decellularized cardiac patch. • Tea polyphenols raise modulus to 392.6 MPa and strength to 67.8 MPa. • Crosslinking adds antioxidant activity and resistance to collagenase degradation. • GTP5 reduces implant-associated inflammation compared with uncrosslinked dECM. • The patch limits ventricular dilation and remodeling after myocardial infarction. Decellularized tissues have been widely used for tissue repair because of their intrinsic ability to modulate immune and inflammatory responses. However, their insufficient mechanical strength often limits their capacity to provide adequate structural support, thereby compromising synergistic therapeutic outcomes in applications such as myocardial and tendon repair. In this study, we developed a decellularization strategy for high-strength porcine diaphragmatic tendon, which enabled effective removal of cellular components while preserving the dense extracellular matrix structure responsible for its superior mechanical strength. After crosslinking with 5 mg/mL tea polyphenols, the resulting decellularized porcine diaphragmatic patch retained anisotropic characteristics comparable to those of native cardiac tissue and achieved a Young's modulus of 392.6 ± 96.8 MPa and an ultimate tensile strength of 67.8 ± 18.83 MPa. These values were higher than those reported for representative decellularized or acellular cardiac repair scaffolds, including decellularized porcine myocardial slices, small intestinal submucosa-derived extracellular matrix (SIS-derived ECM), decellularized pericardial scaffolds, and commercial cardiovascular patches. This strategy preserved the intrinsic mechanical strength of the diaphragmatic tendon while ensuring efficient DNA removal, enabling effective mechanical support and stress reduction in the infarcted myocardium. In addition, tea polyphenols as the crosslinking agent, conferring antioxidant properties while further enhancing the immunomodulatory and anti-inflammatory effects of the decellularized scaffold. In a rat myocardial infarction model, the tea polyphenol-crosslinked decellularized diaphragmatic tendon mitigated ventricular dilation and delayed adverse remodeling through the synergistic effects of mechanical support, antioxidation, and immunomodulation, highlighting its potential for myocardial repair and other therapeutic applications requiring both high mechanical strength and bioactivity.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Bochen Jiang,Yanhua Lei,Kai Sun,Qing Chen,Fei Zhang,Yan An,Yuliang Zhang,Yi Lin,Yuan Yuan,Tao Liu,Xiaofeng Li
Ice accumulation is an important challenge for daily life and industrial production. The photothermal effect offers a promising approach for active de-icing to address this issue. While the photothermal effect of polyphenol-metal ion complex is extensively studied in photothermal cancer therapy, its application in de-icing remains relatively unexplored. Herein, a durable photothermal superhydrophobic coating was designed by combining F-SiO 2 @Tp/Fe (Tea polyphenol-Fe 3+ ) nanoparticles and silicone resin using a one-step spray method. Due to the unique micro-nano structure, the resulting coating exhibited excellent superhydrophobicity, characterized by water contact angle (CA) of up to 159° and sliding angle (SA) of less than 2.5°. Additionally, the coating demonstrated reliable mechanical durability and chemical stability, as evidenced by its good performance in sandpaper abrasion, tape peeling and electrochemical corrosion tests. Moreover, owing to the efficient photothermal conversion of F-SiO 2 @Tp/Fe nanoparticles , surface temperature of the coating can quickly reach 81 ℃ under 1 kW/m 2 simulated sunlight irradiation (1 Sun). The prepared coating exhibits over three times delayed icing time under 1 sun irradiation at − 25 °C in comparison to the absence of light. And the coating also exhibits stable de-icing and defrosting cycle performance. These findings demonstrate effective synergistic effect of anti-icing and de-icing in the F-SiO 2 @Tp/Fe photothermal superhydrophobic coating, showcasing its promising application potential in practical engineering.
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高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Zijian Liang,Pangzhen Zhang,Wen Ma,Xin-An Zeng,Zhongxiang Fang
A new type of flavored wine was produced by macerating either green tea or black tea into Chardonnay wine and model wine respectively, where the physicochemical properties (pH, titratable acidity, color) were modulated. Significant ( p < 0.05) increases of total phenolic content and antioxidant activity (assessed by DPPH, FRAP and ABTS assays) were also observed in the tea macerated wines. A total of 160 phenolic and non-phenolic compounds were identified by HPLC-DAD-ESI-QTOF-MS/MS, where 55 phenolics were newly found in the tea macerated Chardonnay wine. The interaction between wine and tea phenolics led to additional 29 phenolic compounds and 4 non-phenolic compounds that were not found in either Chardonnay wine or tea. Catechin and epigallocatechin gallate were the most abundant phenolic compounds and contributed to the improved antioxidant activities. This study provided a promising prospect of tea as a novel additive in the production of flavored wine with enhanced functionalities.
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高影响因子
Food Science and Human Wellness
·
2023
·
IF 7
Yilin Lin,Ruifei Wang,Xiaoqing Li,Keren Agyekumwaa Addo,Meimei Fang,Yehui Zhang,Yigang Yu
Escherichia coli O157:H7 is one of the major foodborne pathogenic bacterial that cause infectious diseases in humans. The previous found that a combination of kojic acid and tea polyphenols exhibited better activity against E. coli O157:H7 than using either alone. This study aimed to explore responses underlying the antibacterial mechanisms of kojic acid and tea polyphenols from the gene level. The functional enrichment analysis by comparing kojic acid and tea polyphenols individually or synergistically against E. coli O157:H7 found that acid resistance systems in kojic acid were activated, and the cell membrane and genomic DNA were destructed in the cells, resulting in "oxygen starvation". The oxidative stress response triggered by tea polyphenols inhibited both sulfur uptake and the synthesis of ATP, which affected the bacteria's life metabolic process. Interestingly, we found that kojic acid combined with tea polyphenols hindered the uptake of iron that played an essential role in the synthesis of DNA, respiration, tricarboxylic acid cycle. The results suggested that the iron uptake pathways may represent a novel approach for kojic acid and tea polyphenols synergistically against E. coli O157:H7 and provided a theoretical basis for bacterial pathogen control in the food industry.
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高影响因子
JOURNAL OF FOOD SCIENCE
·
2023
·Vol. 88
·期 12
·5291-5308
·
IF 3.9
Yani Pan,Helin Lv,Fuyuan Zhang,Shuxi Chen,Yan Cheng,Shicheng Ma,Hao Hu,Xiyu Liu,Xiaoyong Cai,Fangyuan Fan,Shuying Gong,Ping Chen,Qiang Chu
Oral cavity contains the second largest microbial community in the human body. Due to the highly vascularized feature of mouth, oral microbes could directly access the bloodstream and affect the host healthy systemically. The imbalance of oral microbiota is closely related to various oral and systemic diseases. Green tea extracts (GTE) mainly contain tea polyphenols, alkaloids, amino acid, flavones, and so on, which equipped with excellent anti-inflammatory activities. Previous studies have demonstrated the beneficial effects of GTE on oral health. However, most researches used in vitro models or focused on limited microorganisms. In this study, the regulatory effect of GTE on oral microbiome and the alleviative effect on oral inflammation in vivo were evaluated. The results showed that GTE could efficiently alleviate the inflammations of the tongue, cheek pouch, as well as throat. GTE effectively inhibited the activation of NF-κB through the upregulation of the anti-inflammatory cytokine interleukin (IL)-10, consequently leading to reduced expression of pro-inflammatory cytokines IL-6 and tumor necrosis factor-α. The indexes of spleen and thymus were also elevated by GTE in stomatitis mice. Moreover, GTE promoted the growth of probiotics Lactobacillus and Bacillus , inhibited the reproduction of pathogens Achromobacter , reversing the microbiota disorders in oral cavity. This study not only presents a novel approach for enhancing oral microecology but also facilitates the wider adoption of tea consumption.
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高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2023
·
IF 6
Yongyi Yang,Juan Peng,Qingqing Li,Qinfei Song,Quentin Cronk,Biao Xiong
Dark hawk tea, produced through pile-fermentation of Lauraceae family leaves, which is rich in various beneficial ingredients and health functions, relies heavily on microbial activity for its unique characteristics. However, the processing technology of dark hawk tea and the microorganisms' dynamic changes during its pile-fermentation remain largely unknown. In this study, based on the previous work, we optimized pile-fermentation parameters for analyzing changes in dark hawk tea's chemical components, volatile substances, and microbial diversity. The tea exhibited superior sensory scores and biochemical qualities under optimal conditions (35 °C, 62% water, 24 h), measuring 5.7 mg/g amino acid content. Gas chromatography-mass spectrometry (GC-MS) identified 108 volatile compounds, notably terpenes, ketones, and esters. Microbial analysis revealed Bacteroides and Faecalibacterium as dominant bacteria and Cladosporium and Mortierella as dominant fungi. Cladosporium prevailed in early fermentation, shifting to Mortierella later. Predicted metabolic pathways highlighted microbial functional genes predominantly participated in carbohydrate, amino acid, and energy metabolism during the pile-fermentation. These results hold important implications for expanding the variety of hawk tea products and deepening our understanding of microbial community dynamics through the pile-fermentation of dark hawk tea.
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高影响因子
TALANTA
·
2023
·
IF 6.1
Yanmei Shi,Kai Hu,Lin Mei,Liqin Chao,Mingxia Wu,Zhihong Chen,Xiangxiang Wu,Jingyi Qiao,Pingsheng Zhu,Mingsan Miao,Sisen Zhang
The use of two-dimensional heterostructure composite as electrode modification material has become a new strategy to improve the electrocatalytic activity and electroactive sites of electrochemical sensor. Herein, a soluble heterostructure, namely rGO-PSS@MXene, was designed and synthesized by integrating poly (sodium p -styrenesulfonate)-functionalized reduced graphene oxide into MXene nanosheets via ultrasonic method. The interactive heterostructure can effectively alleviate the self-stacking of MXene and rGO, endowing them with superior electron transfer capacity and large specific surface area , thereby producing prominent synergistic electrocatalytic effect towards rutin . In addition, the excellent enrichment effect of rGO-PSS@MXene for rutin also plays an important role through the electrostatic and π-π stacking interactions. The electrochemical characteristics of rutin on the sensor were examined in detail and a sensitive sensing method was proposed. Under optimized conditions, the method showed satisfactory linear relationship for rutin in the concentration range of 0.005–10.0 μM, with limit of detection of 1.8 nM (S/N = 3). The quantitative validation results in herbal medicine and commercial Tartary buckwheat tea were highly consistent with the labeled quantity and the results of HPLC determination, respectively, suggesting the sensor possessed excellent selectivity and accuracy. This proposed strategy for rutin determination is expected to expand the application of MXene heterostructure in electrochemical sensors, and is envisioned as a promising candidate for quality monitoring of drugs and foods.
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高影响因子
危险品化学品经营许可证（带存储）