FOOD CHEMISTRY
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2021
·
IF 7.514
Wenji Zhang,Junxi Cao,Zhigang Li,Qiuhua Li,Xingfei Lai,Lingli Sun,Ruohong Chen,Shuai Wen,Shili Sun,Zhaoxiang Lai
Each type of tea has a unique volatile profile due to its variety, processing technologies and origin. Using HS-SPME and GC/MS, we analyzed the changes of volatile components in cultivar Yinghong No. 9 during pile-fermentation every 10 days. A total of 94 compounds showed significant differences during a total of 60 days mainly including alkanes, ketones, esters, terpenes, aromatics and heterocyclic compounds. Interestingly, 13 metabolites were progressively reduced during the first 20 days and remained unchanged in subsequent procedures, while 17 metabolites remained unchanged in the early stage and progressively increased during the last 20 days of pile fermentation, indicating that they are characteristic volatile compounds of raw material sun-dried green tea and dark tea, respectively. β-ionone, phenylethyl alcohol, and a-ionone could be the top three contributed aroma compounds in the final dark tea. Our study provides a theoretical basis for process and quality improvement of Yinghong No. 9.
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Food Additives and Contaminants Part A-Chemistry Analysis Control Exposure & Risk Assessment
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2021
·
IF 3.057
Qinqin Xu,Zikai Liu,Chen Yan,Runhua Lu,Wenfeng Zhou
In this study, a novel sorbent, 1-octyl-3-methylimidazolium hexafluorophosphate functionalised magnetic poly β-cyclodextrin, was successfully synthesised and applied to magnetic solid-phase extraction for the determination of pyrethroids in tea infusions. The sorbent was characterised by transmission electron microscopy, energy-dispersive spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, vibrating sample magnetometer and Brunauer–Emmett–Teller measurement. All factors affecting extraction efficiency, such as sorbent amount, extraction time, ionic strength and desorption conditions, were optimised individually. Under the chosen conditions, wide linearity (2.5–500 μg L−1) with determination coefficients ranging from 0.9995 to 0.9999, low limits of detection of 0.32–0.54 μg L−1 and good precision (intra-day: 2.6–7.0%; inter-day: 3.5–7.6%) were achieved for four pyrethroids in tea infusions. The relative recoveries of target analytes in real tea infusion samples were from 70% to 101% with relative standard deviations lower than 9.1%. We conclude that the proposed method is promising in the detection of pyrethroids in tea infusions.
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FOOD CONTROL
·
2021
·
IF 5.548
Yufan Yang,Yuanyue Shi,Xueke Cao,Qian Liu,Hao Wang,Baohua Kong
In this study, the blending electrospinning technique was successfully used to prepare poly (vinyl alcohol)/ethyl cellulose/tea polyphenol (PVA/EC-TP) nanofibrous films for the first time. The morphology observation showed that the fiber diameter ranged from 213 ± 40 nm to 432 ± 78 nm. The thermal analysis indicated that PVA/EC-TP composite nanofibrous films had superior thermal stability to pure PVA nanofibrous film. The wettability test showed that the water contact angle of composite nanofibrous films was significantly increased from 22° to 109°. Water stability and water barrier ability analyses indicated the water solubility of composite nanofibrous films was significantly decreased from 100% to 17%, and the water vapor permeability was reduced from 0.71 to 0.42 g⋅mm/m 2 ⋅h⋅kPa. Meanwhile, the PVA/EC-TP composite nanofibrous films exhibited good antioxidant and antimicrobial activity. The application assay showed that the PVA/EC-TP nanofibrous films with high TP content could effectively extend the shelf life of pork by 3 days.
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Materials Today Communications
·
2021
·
IF 3.383
Jinxing Song,Huafeng Feng,Mengqi Wu,Linxiao Chen,Wei Xia,Wenqing Zhang
Biodegradable membranes of chitosan and its composite with other natural polymers provide a promising solution for biomaterials. To further improve the antibacterial activities of chitosan (CS)/hydroxypropyl methyl cellulose (HPMC) membrane, natural extracts tea polyphenols (TP) were employed in this work. And TP was encapsulated by β -cyclodextrin (CD) beforehand to improve its compatibility with HPMC. To our knowledge, it’s the first time ever reported to use CD encapsulated TP in CS/HPMC membranes. And variety characterization results such as Fourier transform infrared spectroscopy (FTIR), ultraviolet spectra (UV) and dynamic light scattering (DLS) showed that TP had successfully encapsulated with CD. After the solvent blending of CS/HPMC and CDTP, CS/HPMC/CDTP membrane was prepared by a casting method and exhibited good toughness and tensile strength. Finally, bacterial inhibitive rate and inhibition zones of the membrane with E. coli and S. aureus proved the enhanced antibacterial as expected. And the morphology of the bacteria was observed to estimate the possible interaction approach of materials and bacteria. The novel biodegradable membrane can be used for antibacterial coating application.
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Food & Function
·
2020
·Vol. 11
·期 11
·9634-9650
·
IF 4.171
Jie Shen,Pei Li,Shuangshuang Liu,Qing Liu,Yue Li,Zheng Zhang,Chengmin Yang,Mengying Hu,Yuhua Sun,Chunnian He,Peigen Xiao
Despite that colorectal cancer (CRC) is a severe global health problem, effective chemopreventive strategies against CRC are still lacking. Huang-qin tea (HQT), a healthy herbal tea, is prepared from the aerial parts of Scutellaria baicalensis Georgi and has been consumed in China for thousands of years. HQT contains abundant flavonoids, which display potent anticancer effects, but no research studies have investigated the cancer-preventive effects of HQT on CRC in vivo. Here, we found that HQT inhibits azoxymethane-induced aberrant crypt foci (ACF) formation in a preneoplastic colonic ACF rat model. The essential role of the gut microbiota in the chemopreventive effect of HQT on CRC in a pseudo-germ-free rat model was confirmed. Besides, HQT modulates inflammatory cytokine expression by significantly decreasing IL-1β, IL-6, IL-10, and TNF-α expression, and elevating IFN-γ production. 16S rDNA sequencing analysis indicated that HQT regulated the gut microbiota by increasing the abundance of beneficial bacteria (Lachnoclostridium, Alistipes, Roseburia, and Lactococcus) and reducing the levels of Bacteroides, Parasutterella, and unidentified_Clostridiales. Fecal metabolomics showed that HQT modulated the AOM-induced metabolomic disorder, and these altered metabolites were almost involved in the lipid metabolic pathways. The Spearman correlation analysis revealed a correlation between the gut microbiota and fecal metabolites. Collectively, these results suggested that HQT exerted beneficial effects on host health by inhibiting inflammation, and by regulating the gut microbiota profile and certain metabolic pathways. In conclusion, HQT inhibits AOM-induced ACF formation by modulating the gut microbiota composition and improving metabolomic disorders, indicating the potential of HQT as a functional beverage candidate for the prevention and treatment of CRC.
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Separation Science Plus
·
2021
·Vol. 4
·期 3
·108-117
·
IF 0
Xu Wang,Hao Zhang,Min Lu,Hui Jiang,Fang-Bo Xia,Jian-Li Gao,Jian-Bo Wan,Feng-Qing Yang
In this study, thrombin inhibitors in tea were characterized by combining thrombin inhibition assay of tea extracts with ultra high performance liquid chromatography–mass spectrometry based multivariate statistical analysis. The inhibitory activity on thrombin for ten tea samples were tested in vitro. Then, upon collecting and processing liquid chromatography-mass spectrometry data, combined with the results of activity assays, principal component analysis, and orthogonal partial least squares discriminant analysis were applied to predict discriminate differential markers. Six of twelve predicted marker compounds were tentatively identified. Among them, epigallocatechin 3- O -gallate, epicatechin gallate, epigallocatechin and gallocatechin 3- O -gallate showed good inhibitory activity on thrombin with IC 50 values of 5.033, 6.573, 6.704 and 6.842 mM, respectively. Moreover, molecular docking results indicated that these four active compounds could insert into the catalytic activity pocket of thrombin and the residue GLU192 may be their binding site.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2020
·Vol. 21
·期 5
·1828
·
IF 4.556
Songbo Lin,Yanan Dong,Xiwang Li,Yuxian Xing,Miaomiao Liu,Xiaoling Sun
Jasmonates (JAs), the group of lipid-derived hormones, were found to control the defense responses in a myriad of plants. Meaningfully, the macrolactones of 12-hydroxy jasmonate isoleucine (12OH-JA-Ile) were reported to induce the defensive response of wild tobacco. However, little to nothing has been known about the elicitation effect of JA-Ile-macrolactones on woody plants to harmful organisms, let alone its underlying mechanisms. Here, we first optimized the synthetic routine using mild toxic reagent isobutyl chloroformate instead of ethyl chloroformate for conjugation, and we used acetonitrile (MeCN) instead of ethyl alcohol for the better dissolution ofp-toluenesulfonic acid (p-TsOH) to gain JA-Ile-macrolactones. JA-Ile-macrolactone5b-treated tea plants significantly inhibited the larvae weight gain ofEctropis obliqualarvae and the lesions caused byColletotrichum camelliae. Furthermore, the expression level ofCsOPR3was significantly upregulated in5b-treated leaves. Meanwhile,5breduced the accumulation of eriodictyol 7-O-glucuronide (EDG) in tea plants, which was confirmed to promote the growth rate ofE. obliqualarvae by artificial diet assay. In conclusion, our study proved that the exogenous application of5bcould induce the tea plant resistance both to herbivoreE. obliquaand pathogenC. camelliae, and EDG was identified as one of the secondary metabolites that could influence the growth rate ofE. obliqua, but it did not directly influence the infection ofC. camelliaein vitro. Further research should be carried out to clarify the mechanism through which5binduces tea plant resistance toC. camelliae.Keywords:JA-Ile-macrolactone;induced resistance;Camellia sinensis;Ectropis obliqua;Colletotrichum camelliae
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EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2020
·Vol. 246
·期 7
·1483-1494
·
IF 2.366
Zhu Jiangxiong,Du Mengke,Wu Meirong,Yue Pengxiang,Yang Xiufang,Wei Xinlin,Wang Yuanfeng
In this study, two novel mixed ACE-inhibiting peptides, namely Se-TAPep 1 and TAPep 1, were prepared and purified from selenium-enriched and common alkali-soluble proteins using a series of process, and then its physicochemical properties and oligopeptide sequence were analyzed. The results showed that Se-TAPep 1 and TAPep 1 could be successfully separated, but their ACE inhibitory activities were different (IC50 values were 13.39 mg/mL and 23.56 mg/mL, respectively), this may be related to the difference in selenium content. Further analysis of physicochemical properties showed that the protein or peptide fractions contained their characteristic absorption peaks and contained aromatic amino acids, while the apparent morphology was different, the presence of selenium could change the apparent morphology of protein or polypeptide fractions, arranging of selenium-enriched fractions more irregular. The amino acid composition analysis showed that the Pro content of the selenium-enriched fractions was higher than that of the ordinary component, whereas the oligopeptide sequence analysis showed that both LQPSLGFP derived from Se-TAPep 1 and AETGEIKGHY derived from TAPep 1 contained some characteristics of highly active ACE-inhibiting peptides, but the characteristics of LQPSLGFP were more conspicuous, which may be related to its molecular weight and source of mixed peptides. These findings indicated that the selenium-enriched tea mixed peptides had better potential uses than ordinary tea mixed peptides in the preparation of functional food.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2020
·
IF 4.006
Jiajun Chen,Hairong Huang,Yi Chen,Jianhua Xie,Yiming Song,Xinxin Chang,Shiqi Liu,Zipei Wang,Xiaobo Hu,Qiang Yu
The effects of Trichoderma viride fermentation treatment on the structural characteristics and in vitro binding capacity of three heavy metal ions (Pb, Cd, Cu) of soluble dietary fiber (SDF) from tea residues were investigated. Compared with the yield of SDF from untreated tea residues (U-SDF), that of fermented tea residues (F-SDF) significantly increased from 4.3% to 31.56% under the optimal conditions by using response surface methodology . The F-SDF exhibited higher uronic acid content (34.82% vs 17.81%), crystallinity (23.11% vs 17.36%) and thermal stability than U-SDF. Moreover, the specific surface area of F-SDF increased after fermentation by SEM analysis . Difference appeared in the monosaccharide composition ratio of F-SDF (0.06:0.77:1.00:2.41:0.63:0.86:1.80) and U-SDF (0.02:0.81:1.00:0.34:0.13:1.39). Furthermore, the binding capacity of SDF for Pb, Cd, and Cu at pH 7.0 were more than 2.4 times than that at pH 2.0. The binding capacity of F-SDF for Pb (664.5 vs 590.7 μmol/g), Cd (405.6 vs 349.6 μmol/g), and Cu (368.5 vs 307.9 μmol/g) were significantly increased than U-SDF. The overall results indicated that F-SDF could be used as a potential food additive to protect the body from the hazard of food-derived heavy metals.
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FOOD CHEMISTRY
·
2020
·
IF 6.306
Mingxin Niu,Zuopeng Li,Wenjuan He,Wenfeng Zhou,Runhua Lu,Jing Li,Haixiang Gao,Sanbing Zhang,Canping Pan
Herein, we developed a novel magnetic solid phase extraction method based on attapulgite-modified magnetic metal-organic frameworks (ATP@Fe 3 O 4 @ZIF-8), and this method could be used for the determination of benzoylureas when it was coupled with high-performance liquid chromatography. The established method was validated in terms of linearity (2.5–500 μg L −1 , with correlation coefficient (R 2 ) > 0.9994), accuracy (with satisfactory recovery of 88.29–95.99%) and precision (with relative standard deviation (RSD) of less than 8%). In addition, the enrichment factors (EF) ranged from 63.6 to 72.2. Limit of detection (LOD) and limit of quantitation (LOQ) were 0.7–3.2 μg L −1 and 2.3–10.7 μg L −1 , respectively. Moreover, there was hardly any noticeable loss of the extraction efficiency when this extraction method undergoes five cycles. Finally, this method was successfully used for the determination of six benzoylureas in different tea infusions and the determined relative recoveries ranged from 78.8 to 114.3%.
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JOURNAL OF CHROMATOGRAPHY A
·
2020
·
IF 4.049
Heng Qian,Qian Yang,Yuan Qu,Ziwei Ju,Wenfeng Zhou,Haixiang Gao
Deep eutectic solvents (DESs) were used as an extractant for the determination of pyrethroids in environmental water and tea beverage samples. Three different acids were chosen as hydrogen bond donors for preparation of DESs, and decanoic acid was optimal because of its high recovery. Factors affecting relative recovery were optimized individually, including salt addition, surfactant addition, extraction temperature, DES amount, and sample volume etc. Under the optimized experimental conditions, the relative recovery of pyrethroids was from 89.3% to 97.7%, with relative standard deviation (RSD) values ranging from 1.75% to 2.73%. The linear correlation coefficient ranged from 0.9981 to 0.9992, and the linear range was between 1.9 and 500 μg/L. Based on a signal-to-noise ratio (S/N) of 3:1, the limit of detection (LOD) values were 0.56 to 1.24 μg/L. The enrichment factor ranged from 92 to 105. In conclusion, good extraction efficiency was achieved in tea beverage samples under the optimized conditions.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2021
·
IF 5.279
Ge Ge,Jie Zhao,Jiabao Zheng,Mouming Zhao,Weizheng Sun
This study aimed to investigate the effect of tea polyphenol extract (TPE) on the in vitro gastric digestion of soymilk. Fluorescence recovery after photobleaching was applied to measure pepsin diffusivity in soymilk. The characteristics of soymilk digesta were evaluated by gel electrophoresis, degree of hydrolysis (DH), molecular weight distribution, free amino acid analysis, particle size, antioxidant capacity, and trypsin/chymotrypsin inhibitor activity (TIA/CIA). The binding between soy proteins and tea polyphenols could significantly impair in vitro gastric digestion of soymilk by decreasing pepsin diffusivity from 91.3 to 70.3 μm2/s and DH from 17.13 to 13.93% with 1.2 mg/g TPE addition. Soymilk with 0.6 mg/g TPE addition exhibited low TIA/CIA and a strong antioxidant capacity in gastric digesta, which might be good for the following intestinal digestion. A better understanding of the effect of polyphenol on the digestion of protein-based food may be beneficial to innovation in food manufacturing.
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