JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2024
·
IF 4
Yuhong Lin,Ran Wei,Jack Jingyuan Zheng,Jian Zheng,Wen Zhang,Muhammad Yasir,Kayama Kayama,Xingquan Liu,Zhucheng Su
Lethariella , a folk herbal tea originating from southwest China, has been consumed for centuries as a traditional beverage. However, the distinct chemical characteristics and sensory properties of Lethariella remain poorly understood. In this study, the two most commonly found Lethariella species, Lethariella zahlbruckneri (LZ) and Lethariella cladonioides (LC), were collected for detailed analysis. After brewing, the infusion of LZ exhibited a taste profile that was more astringent, bitter, and thicker, whereas LC liquor was characterized by a sweeter taste profile, coupled with a stronger lingering sweet aftertaste. This variation in taste between LZ and LC infusions can potentially be ascribed to the higher levels of phenolic compounds present in LZ in comparison to LC, along with the lower content of sugars in LZ. The aroma intensity of LC is more robust, with its relative contents of key volatile compounds being significantly higher compared to those in LZ.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Qingsong Hu,Yanbing Liu,Meng Ye,Ting Zhou,Mingyang Li,Wei Jiangs,Binxian Gu
Photocatalytic technology has been widely concerned because of its characteristics of simple operation, low energy consumption and no secondary pollution. In this work, tea biomass carbon quantum dots (T-BCDs) modified PbBiO 2 Cl nanosheets have been prepared via ionic liquid assisted solvothermal method. Firstly, various characterization techniques were employed to study the morphology and structure of the catalysts. Subsequently, we evaluated the photocatalytic activities of the acquired catalysts on account of degradation of ciprofloxacin (CIP) under visible and near-infrared light. The experimental results show that the photocatalytic activity of nanocomposites is obviously improved. Among which, 3 mL T-BCDs/PbBiO 2 Cl displays the strongest photocatalytic performance. In addition, the reasons for the enhancement of photocatalytic activities were explored by photoelectrochemical characterizations. T-BCDs can be used as electron acceptors, which can effectively boost the charge transfer and inhibit the recombination of photogenerated carriers. Finally, the photocatalytic mechanism was elucidated through free radical trapping experiments, electron spin resonance (ESR) technology and band structure analysis. Superoxide radical (•O 2 − ), hydroxyl radical (•OH) and holes (h + ) are the main active substances involved in antibiotic degradation. This research aims to develop high-performance photocatalysts that contribute to environmental remediation.
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POLYMER BULLETIN
·
2025
·
IF 4
Shah Nouman Ali,Shakir Namra,Gul Rizwan M.,Xu Jia-Zhuang,Li Zhong-Ming
Ultra-high molecular weight polyethylene (UHMWPE) is a versatile polymer with various industrial applications, particularly in orthopedic implants and structural materials. However, its susceptibility to oxidation limits its utility in demanding environments. This study investigates the potential of d -sorbitol (DS), a natural polyol, in enhancing the oxidation stability and crosslink density of UHMWPE when stabilized with tea polyphenols. Tea polyphenols, such as epigallocatechin gallate (EGCG), have been previously evaluated as a promising candidate to stabilize UHMWPE against oxidation without affecting its crosslink density. However, the higher content of EGCG has adverse effect on its mechanical properties. It is hypothesized that addition of DS to EGCG can improve the oxidation and crosslink density of UHMWPE blends. For this purpose, EGCG/DS was blended with UHMWPE at low antioxidant concentrations (≤ 1 wt%), and its comprehensive performance was evaluated. Results demonstrate that the incorporation of d -sorbitol effectively retards oxidation-induced degradation in tea polyphenol-stabilized UHMWPE. The presence of d -sorbitol enhances the crosslink density within the polymer matrix, thereby improving its resistance to oxidative stress. Furthermore, the study elucidates the underlying mechanisms through which DS interacts with EGCG and UHMWPE, elucidating the formation of stable complexes that mitigate oxidative damage. The in vitro biocompatibility of the blends was also very promising for use in artificial joints.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ye-Ting Wang,Qing-Ping Zheng,Yu Chai,Yu-Cang Zhang,Yan-Zhen Zheng
In this study, an efficient and environmentally friendly pretreatment system was developed by combining the biocompatible ionic liquid choline levulinate (ChLA) with monoethanolamine (MEA) to enhance the fractionation and valorization of tea stems (TS). Under optimized conditions (140 °C, 2 h, 20 % water content, ChLA:MEA molar ratio of 1:2), the system achieved high retention of cellulose (89.2 ± 1.4 %) and hemicellulose (76.6 ± 1.4 %), alongside substantial lignin removal (76.9 ± 0.7 %). Spectroscopic and morphological analyses (FTIR, XRD, SEM) confirmed effective disruption of the lignin-carbohydrate complex, a reduction in cellulose crystallinity, and enhanced substrate accessibility. Consequently, enzymatic hydrolysis of the pretreated biomass yielded glucose and xylose at 93.7 ± 0.6 % and 85.7 ± 0.7 %, respectively, representing a more than 212 % improvement in saccharification efficiency compared to untreated TS. Furthermore, the pretreatment selectively cleaved lignin-carbohydrate ester linkages, enabling the recovery of lignin nanoparticles (LNPs) characterized by a high β-O-4 linkage content, low condensation degree, and low molecular weight. These LNPs were incorporated into polyvinyl alcohol (PVA)-based nanocomposite films, which exhibited improved mechanical properties, hydrophobicity, and UV-shielding performance. Overall, this work presented a sustainable and integrated strategy for the comprehensive utilization of lignocellulosic biomass into high-value multifunctional materials.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Iradukunda Blaise,Xinjie Liu,Jiafu Qu,Zhuoqing Lu,Xinyue Ma,Nan Xu,Xing Yan
This study aims to improve the applicability of green-synthesized nano zero-valent iron (GT-nZVI) for wastewater treatment under natural pH conditions by developing a novel -nZVI composite stabilized with polystyrene sulfonate (PSS) and green tea polyphenols (GT-nZVI@PSS) at different PSS/Fe mass ratios (0.01–0.5) for Pb(II) removal. Particular emphasis was placed on elucidating the influences of humic acid (HA) and sulfate ubiquitous constituents in wastewaters on Pb(II) removal performance, with the underlying mechanisms of their effects systematically clarified. Results demonstrated that GT-nZVI@PSS (PSS/Fe = 0.05) exhibited excellent Pb(II) removal at neutral pH, primarily driven by enhanced Pb(II) reduction and Pb 0 precipitation. This performance is mainly attributed to improved dispersibility resulting from the synergistic effects of PSS and tea polyphenols on the particle surface. HA and sulfate exerted opposing effects on Pb(II) removal by GT-nZVI@PSS. At low concentrations, HA enhanced Pb(II) uptake by increasing the surface negative charge, improving particle dispersion, and providing additional active sites for the formation of Fe–HA/Pb complexes. In contrast, sulfate inhibited Pb(II) removal by disrupting the polyphenol coating and forming surface sulfate–iron species and PbSO 4 precipitates, thereby accelerating passivation and reducing Fe release. However, at high concentrations, excessive HA molecules formed large aggregates that enveloped the particle surfaces, ultimately hindering Pb(II) access to the active sites of GT-nZVI@PSS. Conversely, high concentrations of sulfate promoted GT-nZVI@PSS corrosion, facilitating Fe 0 release and thereby enhancing Pb(II) removal. These findings highlight the crucial role of water matrix constituents in modulating the performance of GT-nZVI@PSS, as an eco-friendly and cost-effective material.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Lan Zhang,Haocun Kong,Bimal Chitrakar,Xiaofeng Ban,Zhengbiao Gu,Yan Hong,Li Cheng,Zhaofeng Li,Caiming Li
Tea polyphenols have been reported as potential α-amylase inhibitors. However, the quantitative structure–activity relationship (QSAR) between tea polyphenols and human pancreas α-amylase (HPA) is not well understood. Herein, the inhibitory effect of twelve tea polyphenol monomers on HPA was investigated in terms of inhibitory activity, as well as QSAR analysis and interaction mechanism. The results revealed that the HPA inhibitory activity of theaflavins (TFs), especially theaflavin-3′-gallate (TF-3′-G, IC 50 : 0.313 mg/mL), was much stronger than that of catechins (IC 50 : 18.387–458.932 mg/mL). The QSAR analysis demonstrated that the determinant for the inhibitory activity of HPA was not the number of hydroxyl and galloyl groups in tea polyphenol monomers, while the substitution sites of these groups potentially might play a more important role in modulating the inhibitory activity. The inhibition kinetics and molecular docking revealed that TF-3′-G as a mixed-type inhibitor had the lowest inhibition constant and bound to the active sites of HPA with the lowest binding energy (−7.74 kcal/mol). These findings could provide valuable insights into the structures-activity relationships between tea polyphenols and the HPA inhibitors.
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PubMed
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PHYTOCHEMICAL ANALYSIS
·
2024
·
IF 3
Yangling Li,Ying Su,Yongjuan Liang,Fangchan Li,Ning Lin,Lin Jiang,Qinghua Lin,Qing Chen
Introduction Kidney tea is an essential herbal medicine. It is widely used to treat conditions such as urinary stones, gallstones, and rheumatoid arthritis. There is currently no standardized or widely accepted research strategy for evaluating the quality of kidney tea granules (KTGs) after granulation. Objectives In this study, we aim to establish a comprehensive strategy for evaluating the quality of KTGs produced from different sources of kidney tea. Methods A TLC combined with HPLC method was established to identify the chemical components in KTGs, and HPLC method was used to determine the contents of rosmarinic acid of KTGs. In order to distinguish samples and identify differential components, similarity analysis, hierarchical cluster analysis (HCA), principal component analysis (PCA), and orthogonal partial least squares discriminant analysis (OPLS-DA) were conducted. Results TLC and HPLC detection confirmed three chemical components of KTGs, which are rosmarinic acid, caffeic acid, and lithospermic acid. HPLC fingerprint analysis revealed a total of seven common peaks in 15 batches of KTGs. Similarity analysis showed that the similarity of all 15 batches of KTGs was greater than 0.969. The peak areas of the seven common peaks were identified by chemical pattern recognition, and the results showed that most of the KTGs from different origins were clustered together, with small differences between them. The PCA and OPLS-DA results showed that two principal components can represent 82.638% of the common peaks of KTGs, among which peak 5 represents rosmarinic acid, which is the main differential biomarker of KTGs from different regions. Quantitative analysis of rosmarinic acid in KTG samples was performed using HPLC fingerprint conditions and the content of rosmarinic acid in 15 batches of KTGs samples was measured to be between 8.01–14.61 mg/g. Conclusion This study combines TLC, HPLC, and chemometrics to establish a stable and reliable method that can quickly and effectively identify the components of KTGs, accurately quantify known components in KTGs, and provide reference for the quality evaluation of KTGs.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Panyu He,Xinglan Fu,Chenghao Wang,Yujiang Gou,Fengjing Cao,Hongwu Tian,Shixiang Ma,Yiyi Liang,Ting An,Guanglin Li
Tea infusion, as one of the most popular beverages, is favored by people around the world. However, tea plants accumulate heavy metals from the soil during growth, which are gradually transferred to the leaves and subsequently decomposed into the tea infusion after soaking in hot water. Long-term consumption of tea infusion containing heavy metals may lead to severe health issues, such as liver dysfunction and cancer. Therefore, rapid, precise, and highly sensitive detection of heavy metals in tea infusion becomes crucial for human health. Traditional methods, such as atomic absorption spectroscopy (AAS), suffer from long detection cycles, high costs, and the risk of secondary pollution from chemical extraction reagents. Thus, this paper presents a method, using laser-induced breakdown spectroscopy combined with electrospinning technology (LIBS-ES), to detect trace amounts of Cr and Cu in tea infusion. The electrospun nanofiber membranes (ENM) were modified with gold nanoparticles (AuNPs) and silver nanoparticles (AgNPs), achieving ultra-sensitive detection of Cr and Cu. The experiment results show that the limits of detection for Cr and Cu are 5 μg/L and 10 μg/L, respectively. Moreover, this method was successfully applied to the detection of Cr and Cu in seven different types of tea infusion, achieving recovery rates of 99 %-106 % and 99 %-108 %, respectively. The method demonstrated good performance even under the interference of other ions at various concentrations, providing a reference for the rapid and highly sensitive detection of heavy metals in tea infusion.
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Foods
·
2024
·Vol. 13
·期 21
·3354
·
IF 4.7
Weiwei Wu,Zhiqiang Zheng,Zhihui Wang,Chenxi Gao,Yilin Liang,Wen Zeng,Weijiang Sun
Diabetes remains a critical global public health challenge, posing a growing threat to human health and well-being. White tea is a lightly fermented tea and one of the six traditional tea categories in China. Owing to its rich content of bioactive compounds such as catechins and alkaloids, it has demonstrated potential anti-diabetic properties. However, its precise bioactive components, mechanisms of action, and relevant molecular targets require further investigation. In this study, an integrated approach combining polyphenol-targeted metabolomics, in vitro antioxidant assays,α-glucosidase inhibition tests, network pharmacology analysis, GEO database exploration, molecular docking, and molecular dynamics simulations was employed to identify the potential anti-diabetic compounds, targets, and mechanisms of white tea. The findings revealed that white tea is particularly abundant in 10 bioactive compounds, including epigallocatechin gallate, epicatechin gallate, and catechin, all of which exhibit significant anti-diabetic potential. These compounds were found to exert their effects by interacting with core molecular targets, namely cathepsin V (CTSV) and nucleotide-binding oligomerization domain-containing protein 1 (NOD1), and engaging in pathways related to signal transduction, apoptosis, and immune responses. This study establishes a strong theoretical basis for advancing white tea research and underscores new opportunities for applying natural products in diabetes therapy.
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EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY
·
2021
·Vol. 123
·期 10
·2000312
·
IF 2.679
Jian-Yuan Yang,Jing Li,Mei Wang,Liu-Feng Zheng,Bin Peng,Xian-Guo Zou,Yu-Long Yin,Ze-Yuan Deng
The oil/water (O/W) emulsions are spontaneously formed during the process of aqueous extraction of camellia oil which indicates that there are natural emulsifiers with excellent emulsifying capacity exist in Camellia oleifera Abel. seeds. To explore the formation mechanism of these emulsions, a strongly emulsifiable component, a tea saponin-carbohydrate-protein complex (TCPC), is separated and purified by means of chromatography. Its physicochemical properties are characterized by the fourier transform infrared, thermogravimetric analysis, and scanning electron microscopy. The emulsifying properties of O/W emulsions prepared with TCPC (pH 7.0) are investigated systematically. The results show that the emulsions are remarkably stable over a wide range of pH values (5–11), ionic strength (0–200 m m NaCl), thermal treatment (60–90 °C; 30 min), and even after 14 days storage at room temperature (10–25 °C). Moreover, the rheological properties reveal that all determined emulsions show typical pseudoplastic fluid characteristics and shear-thinning flow behavior. However, the emulsions are unstable during freeze-thaw cycle. These results imply that TCPC may be one key emulsifiable compound during aqueous extraction of camellia oil. Practical Applications : Aqueous extraction is a promising technique for edible oil extraction from Camellia oleifera Abel. seeds because of its nutrition, safety and economy. However, the oil/water emulsions formed during the process of aqueous extraction of camellia oil, which makes oil hard to be separated. TCPC with excellent emulsifying activity and emulsion stability was separated and characterized, which could be regarded as a potential target to obtain free oil by frozen/thawed method. Thus, it could be contributing to the industrial application of aqueous extraction of camellia oil.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Zhicheng Wu,Xiaobao Su,Zhang Lin,Nasreen Islam Khan,Gary Owens,Zuliang Chen
While iron-based nanoparticles ( n Fe) prepared using green tea extracts have been successfully used to degrade many organic contaminants , their application to remove As(V) remains limited. Thus, in this work, n Fe (GT-1) prepared using a green tea extract was used to removal As(V). The maximum adsorption capacity of GT-1 for As(V) was 19.9 mg g −1 at 298 K. The formation of GT-1 and the removal mechanism of As(V) by GT-1, was examined using XRD, TEM and SEM, which showed that GT-1 was composed of amorphous particulates sized between 50 and 100 nm. GC–MS and LC-MS analysis also showed that biomolecules presented in the green tea extract, including polyphenols and L-theanine, participated in the formation of GT-1. Mössbauer spectral analysis confirmed that an organo-Fe(III) complex was formed due to the reaction between biomolecules and Fe(III). FTIR and XPS showed that the adsorption of As(V) by GT-1 occurred both via complexation with Fe(III) in GT-1 and via coordination of As(V) with free hydroxyl groups on the surface of GT-1. Batch experiments showed that adsorption was spontaneous and conformed to the pseudo-second order kinetic model. Finally, mechanisms for the formation of GT-1 and the removal of As (V) by GT-1 were proposed.
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Journal of Future Foods
·
2025
·
IF 7.2
Junyi Zhao,Wei Jia,Xin Wang,Rong Zhang,Mi Li
Drying is the key step in the processing of tea, and the heat transfer directly influences the retention of organic fractions such as selenocysteine. Selenium-enriched black tea is a specialized fermented tea with higher organic selenium concentration than conventional black tea. To investigate the biotransformation mechanism of seleno-amino acids and bioactive compound variations during the drying process of selenium-enriched black tea, this study innovatively constructed a microwave power-regulated tea drying system. A multi-gradient microwave power (140, 280, 420, 560, 700 W) combined with metabolomics and proteomics was used to systematically analyze the effects of microwave regulation on black tea. The results demonstrated that the biosynthesis efficiency of selenohomolanthionine stabilized, and the synergistic optimization of flavonoids and amino acids was achieved at the 420 W power setting when the leaf water content reached 3%. The levels of key metabolites, such as myricetin (37.58 mg/kg), epicatechin (32.44 mg/kg), and tryptophan (114.62 mg/kg), peaked at 420 W, with the highest level being 6.66 times higher than the hot-air drying group. The interaction pathway revealed core regulatory enzymes showing energy dependence, including flavonol synthase and phenylalanine ammonia-lyase. This research elucidated for the first time that microwave drying regulates the formation of bioactive compounds in black tea through a dual mechanism of modulating the selenium metabolic pathway and activating flavonoid synthesis and amino acid conversion. These mechanistic insights enable controlled microwave processing, paving the way for the future precise manufacturing of functional selenium-enriched tea.
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危险品化学品经营许可证（带存储）