CHEMOSPHERE
·
2023
·
IF 8.8
Zibin Pan,Rongrong Xie,Zuliang Chen
Acid Mine Drainage (AMD) contains various metal/metalloid ions such as Fe, Cu, and As, which all impact seriously on mine ecosystems. Currently, the commonly used chemical methods for treating AMD may cause secondary pollution to appear in the environment. In this study, one-step simultaneous biomass synthesis of iron nanoparticles (Fe NPs) using tea extracts for the removal of heavy metals/metalloids in AMD is proposed. Characterizations revealed that the Fe NPs presented severely agglomerated particles with an average particle size of 119.80 ± 4.94 nm, on which various AMD-derived metal(loid)s, including As, Cu, and Ni, were uniformly dispersed. The biomolecules participating in the reaction in the tea extract were identified as polyphenols, organic acids, and sugars, which acted as complexing agents , reducing agents, covering/stabilizing agents, and promoted electron transfer . Meanwhile, the best reaction conditions (reaction time = 3.0 h, volume ratio of AMD and tea extract = 1.0:1.5, concentration of extract = 60 g/L, and T = 303 K) were obtained. Finally, the simultaneous formation of Fe NPs and their removal of heavy metals/metalloids from AMD was proposed, mainly involving the formation of Fe NPs and adsorption, co-precipitation, and reduction processes of heavy metals/metalloids.
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高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2022
·Vol. 46
·期 2
·2200661
·
IF 3.614
Wenhui Li,Ying Gu,Zikun Liu,Rimao Hua,Xiangwei Wu,Jiaying Xue
A novel solid-phase microextraction device coated with an efficient and cheap thin film of polyurethane was developed for trace determination of 13 widely used pesticides in fruit and tea beverages. A round-shaped polyurethane film covering the bottom of a glass vial was fabricated as the sorbent to exhibit a superior capacity for preconcentrating target compounds and reducing matrix interferences. After optimization of the key parameters including the film type, extraction time, solution pH, ionic strength, desorption solvent, and conditions, this device allowed an efficient adsorption-desorption cycle for the pesticides accomplished in one vial. Coupled with gas chromatography-electron capture detection, the polyurethane-coated thin film microextraction method was successfully established and applied for the analysis of real fruit and tea drinks, showing low limits of detection (0.001–0.015 μg/L), wide linear ranges (1.0–500.0 μg/L, r 2 > 0.9931), good relative recoveries (77.2%–106.3%) and negligible matrix effects (86.1%–107.5%) for the target pesticides. The proposed approach revealed strong potential of extending its application by flexibly modifying the type or size of the coating film. This study provides insights into the enrichment of contaminants from complex samples using inexpensive and reusable microextraction devices that can limit the environmental and health impact of the sample preparation protocol.
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FOOD RESEARCH INTERNATIONAL
·
2022
·
IF 7.425
Yingjie Ma,Hairong Huang,Yan Zhang,Feng Li,Bei Gan,Qiang Yu,Jianhua Xie,Yi Chen
This study investigated the impact of soluble dietary fiber (SDF) from untreated (U-SDF), fermented (F-SDF) and high temperature cooked (H-SDF) from tea residues on formation of acrylamide (AA) and 5-hydroxymethylfurfural (5-HMF) in biscuits. Both 3% F-SDF and 2% H-SDF can simultaneously inhibit AA and 5-HMF and SDFs increased the types of volatile compounds in biscuits. After the determination of the bound polyphenol compositions in SDFs by LC-QTOF-MS/MS, six polyphenols with different structural characteristics were selected to explore their contributions on the inhibitory effect of SDFs and structure-inhibitory capacity relationships in the “glucose-asparagine-linoleic acid” model system. It showed that the inhibitory activities of those polyphenols were greatly affected by the number of hydroxyl groups and methoxy groups on the benzene ring. Almost all polyphenols were also found to scavenge hydroxyl radicals generated in reactions. Thus, this study suggests that the bound polyphenols of SDFs play a key role in the inhibition of AA and 5-HMF.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Jilong Li,Fengze Wu,Yupu Zhang,Ji Feng,Xiujuan Wang,Yi Yang,Zhibing Wang,Hanqi Zhang
In this study, a novel supramolecular solvent based on surface-active ionic liquid was prepared and used as an extraction solvent for dispersive liquid–liquid microextraction of four triazine herbicides in tea samples. The formation mechanism, microstructure and physicochemical properties of supramolecular solvent were studied. Some parameters, including the molar ratio of surface-active ionic liquid to tetrahydrofuran, volume of supramolecular solvent, vortex time, pH of sample solution, type and amount of salt, were investigated and optimized. The good linearities (r > 0.9990) for the analytes were obtained. The limits of detection and quantification for triazine herbicides were in the range of 1.7–2.1 μg kg −1 and 5.6–7.1 μg kg −1 , respectively. The spiked recoveries were 80.0–119.9 %. The supramolecular solvent prepared in this study has the advantages of simple preparation process, low viscosity and good dispersibility. It can be used for the extraction and enrichment of trace triazine herbicides in tea samples.
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高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 6
·1-11
·
IF 6.408
Wang Zhong-Xia,Hu Lei,Wang Wen-Juan,Kong Fen-Ying,Wei Mei-Jie,Fang Hai-Lin,Li Qi-Le,Wang Wei
A novel deep-ultraviolet and dual-emission carbon nanodots (DUCDs)-based dual-channel ratiometric probe was prepared by a one-pot environmental-friendly hydrothermal process using guanidine as the only starting material for sensing polyphenol in tea sample (TPPs). Under the exposure to TPPs, the DUCDs not only provided a characteristic colorimetric response to TPPs, but also displayed TPPs-sensitive ratiometric fluorescence quenching. The detection mechanism was proved to be that enrichment-specific hydroxyl sites (e.g., -NH 2 and -COOH) of DUCDs can specifically react with phenolic hydroxyl groups of TPPs to generate dynamic amide and carboxylate bonds by dehydration and/or condensation reaction. As a result, a new carbon nanomaterial with decrement of surface passivation groups, inherent light-absorbing, and invalid fluorescence emission was generated. The ratio (FL 297nm /FL 395nm ) of fluorescence intensity at 297 nm and 395 nm of DUCDs excited at 275 nm decreased with increasing TPPs concentration. The linearity range was 5.0 ng/mL to 100 µg/mL with a detection limit (DL) of 3.5 ± 0.04 ng/mL for TPPs ( n = 3, 3σ/k). Colorimetry of DUCDs, best measured as absorbance at 320 nm, was increased linearly in the TPP concentration range 200 ng/mL–200 µg/mL with a DL of 94.7 ± 0.04 ng/mL ( n = 3, 3σ/k). The probe was successfully applied to the determination of TPPs in real tea samples, showing potential application prospects in food analysis. Graphical abstract
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Jianfu Chen,Meixia Zheng,Kok Bing Tan,Junyan Lin,Meichun Chen,Yujing Zhu
The aim of this work was to develop an edible packaging material with good performance that can be used for fresh-cut vegetables preservation. The xanthan (XG)-hydroxypropyl methylcellulose (HPMC)-tea polyphenols (TP) composite film (XHT) was prepared by adding TP to the composite film-forming solution of XG and HPMC. At optimum TP dosage of 6% (XHT6), the tensile strength and elongation at break were at the maximum. The antioxidant activity and antibacterial properties were also enhanced, demonstrated good inhibitory ability to Staphylococcus aureus . After 8 days, the amount of Vitamin C that was retained by XHT6 was 127.81% and 7.83% higher than unpackaged and XHT0, respectively. Additionally, the MDA content in green peppers were 39.16% and 78.87% higher than that of unpackaged and XHT0, respectively. Practical applications of XHT films in preserving fresh-cut bell peppers had also shown positive results, making it possible as potential food packaging.
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Food Packaging and Shelf Life
·
2022
·
IF 8.749
Xiaomin Wang,Xue Huang,Fengjuan Zhang,Fanyun Hou,Fangxuan Yi,Xia Sun,Qingqing Yang,Xiangbo Han,Zhanli Liu
In this study, chitosan/zein composite film combined with tea polyphenol was fabricated, and the effect of tea polyphenol on the structure and physical properties of chitosan/zein film was investigated. Low-field nuclear magnetic resonance spectroscopy indicated that the distribution and content of water molecules in chitosan/zein film were changed with the addition of tea polyphenol. The results of fluorescence measurement and secondary structure analysis proved the enhanced physical and structural properties of tea polyphenol composite film. And the film showed favorable stretching resistance and flexibility. Furthermore, the effect of composite film on quality and physiological indexes of mushroom ( Lyophyllum decastes Sing.) stored at 4 °C for 15 d were systematically evaluated. The results indicated that the tea polyphenol composite film showed the effectiveness of maintaining color, texture as well as integrity of cell membrane evidenced by relatively lower membrane permeability and malondialdehyde content of mushrooms. Besides, weight loss and respiration rate were efficiently retarded. In comparison with control and chitosan/zein film, the tea polyphenol composite film inhibited the activity of polyphenol oxidase and peroxidase, while enhanced the activity of antioxidant enzymes (superoxide dismutase and catalase). In a word, the chitosan/zein composite film incorporated with tea polyphenol showed the potential as an effective technology for maintaining the postharvest quality of mushroom ( Lyophyllum decastes Sing.).
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Songjie Li,Weimin Zhang,Ruimin Wang,Congfa Li,Xue Lin,Lu Wang
Partridge leaves ( Mallotus furetianus Muell-Arg.) have long been consumed as popular folk substitute tea for treating hyperglycemia in China. In this study, the inhibiting effects of partridge tea extracts on α -glucosidase and α -amylase were investigated, and then effect of partridge tea aqueous extracts (PTAEs) on glucose consumption capacity of 3 T3-L1 preadipocytes cells was determined. Results verified that PTAEs showed excellent anti- α -glucosidase and anti- α -amylase effects. In addition, the PTAEs evidently promoted glucose consumption capacity of 3T3L1 preadipocytes cells. To this end, a combined method of affinity ultrafiltration and HPLC-ESI-qTOF-MS/MS was used for rapidly screening and identifying the potential inhibitors in the PTAEs. Catechin, epicatechin, rutin, ferulic acid, and kaempferitrin with high affinity capacity indicated strong inhibiting effect on α -glucosidase and α -amylase. Docking studies revealed the potential interactive mechanisms between these major inhibitors and two digestive enzymes. This research shows that partridge tea is effective in preventing and treating post hyperglycemia.
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FOOD CHEMISTRY
·
2021
·
IF 7.514
Li Tian,Shulin Zhang,Jianhua Yi,Zhenbao Zhu,Leqi Cui,Eric Andrew Decker,David Julian McClements
We studied the impacts of protein location (interface or aqueous phase) on the antioxidant and prooxidant activities of tea polyphenols (TP) in model oil-in-water emulsions (pH 7) at a low (0.01% w/v) or high (0.04 % w/v) concentration. TP at 0.01% reduced the levels of both lipid and protein oxidation markers in emulsions, independent of the protein location. However, TP were more potent when proteins were located at the interface. At 0.04%, TP were only weakly antioxidant towards lipids but were prooxidant towards proteins in emulsions with proteins at the interface, whereas they were still somewhat antioxidant for aqueous phase proteins. These results indicate that TP may act as either antioxidants or prooxidants depending on their concentration and also on the location of the proteins in emulsions. The level of TP should be optimized for emulsion-based foods or beverages to achieve optimum antioxidant activity.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Zhihui Wang,Yilin Liang,Chenxi Gao,Weiwei Wu,Jiumei Kong,Zhe Zhou,Zhihua Wang,Yan Huang,Weijiang Sun
This study explored the sensory characteristics, metabolites and antioxidant capability of aged Jinhua white tea (AJWT) over different years of aging and revealed the transformation mechanism of these characteristics during the long-term aging process. The flavor wheel of AJWT was constructed, and its unique flavor was dominated by mellowness, smoothness, a fungus fragrance, and a stale flavor. The high content of theabrownine, soluble sugar, flavonoids and 25 aroma components made important contributions to the formation of the unique flavor of the AJWT, and their content significantly increased during the long-term aging process of 5–10 years. This was related to the microbial bioconversion, the oxidative degradation of catechins, the hydrolysis of flavonosides and the decomposition of polysaccharides. Contrary to folk experience, AJWT had weak comprehensive antioxidant capacity, mainly due to its low content of tea polyphenols, catechin components and caffeine, which decreased significantly during the long-term aging of 5–10 years.
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JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Fukang Deng,Kangchun Li,Qing Feng,Kedi Yang,Fuchuan Huang
As the life expectancy increases, so do the wear and damage to joints caused by increased physical activity. In this regard, the development of biofriendly and nontoxic lubricating materials has important social and economic impact. Therefore, this work develops such a lubricant for joints using tea saponin derivative (TSC16) as the bio-lubricating additive to a choline/N-acetyl- l -proline ionic liquid (IL). The TSC16 molecules aggregated in the choline/N-acetyl- l -proline IL to form short fibrous structures, which increased the viscosity of the IL and improved the formation of a lubricating film on the applied area. The fibrous structure of TSC16 enhanced the strength of the lubricating film and improved the lubrication and anti-wear performance. Overall, the developed IL blend exhibits promise for tissue engineering applications.
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MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Liuna Wei,Ou Hu,Hengye Chen,Tianming Yang,Yao Fan,Lu Xu,Lei Zhang,Wei Lan,Yuanbin She,Haiyan Fu
Pu-erh tea is a unique post-fermented tea with special quality and unique aroma characteristics, which are achieved by aging as part of the tea-making processing in China. In this work, we developed a new method, based on the combination of the mid-infrared (MIR) spectroscopy of graphene oxide-5,10,15,20-mesotetra (4-aminophenyl) porphyrin hybrid (GO-TAP), with chemometrics, for the variety identification and age prediction of twelve Pu-erh teas. Partial least squares discriminant analysis (PLSDA) and partial least squares regression (PLSR) models were respectively employed to classify the variety of and predict the age of Pu-erh teas based on the collected MIR spectra. Compared with traditional MIR spectroscopy, MIR spectroscopy based on GO-TAP gave better accuracy and specificity in variety classification and age prediction. The GO-TAP complex-based MIR spectroscopy sensor coupled with chemometrics could achieve 100% accuracy for variety classification and predicts storage time of Pu-erh tea. This method can be applied for the accurate identification and prediction of Pu-erh tea storage time, and it might have enormous potential for the application in storage time identification of other food stuff.
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危险品化学品经营许可证（带存储）