Food Quality and Safety
·
2024
·
IF 3
Dai Binwei,Chen Weixuan,Huang Weihong,Liu Junsheng,Li Bo,He Puming,Grierson Donald,Tu Youying,Wu Yuanyuan
Osmanthus black tea (OBT) is produced by reprocessing black tea while it absorbs the fragrance of Osmanthus fragrans (O. fragrans) and this scenting process is crucial for forming the unique aroma of OBT. In this study, more than eighty volatile compounds of OBT were analyzed by gas chromatography-mass spectrometry (GC-MS) and six compounds, α-ionone, β-ionone, γ-decalactone, dihydro-β-ionone, dihydro-β-ionol, and 6-pentyl-2-pyrone, were identified as the key volatiles of OBT by weighted gene co-expression network analysis (WGCNA) and orthogonal partial least squares discriminant analysis (OPLS-DA). Variations in the amounts of these compounds occurred with different scenting process conditions such as scenting time (ST) and the ratio of flower to tea (RFT) were discussed. In addition, base teas with a high proportion of pekoes produced higher quality OBT by absorbing more key volatile compounds from O. fragrans. Comparing OBTs made from the fast-scenting process (FS) and the traditional scenting process (TS), showed that a higher aroma quality was obtained through repeated scenting rounds of TS. This study provides valuable insights into the volatile compounds and base tea requirements for an effective scenting process and a theoretical basis for improving scenting technology.
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DOI
高影响因子
Food Chemistry-X
·
2025
·
IF 8.2
Zixuan Li,Mohammad Rizwan Khan,Naushad Ahmad,Wanli Zhang,Gulden Goksen
In this study, pectin (PE) composite films containing tea polyphenol (TP) and graphene oxide (GO) were developed. The effects of TP and GO on the appearance, structure, mechanical properties, barrier properties, hydrophobicity, and antioxidant properties of pure PE films were investigated. The results demonstrated that the addition of 1 % w /w TP and 1 % w/w GO increased the tensile strength (TS) and elongation at break (EB) of the composite films to 20.22 MPa and 34.18 %, respectively. Additionally, the water vapor permeability (WVP) was reduced to 0.67 ± 0.17 (×10 −10 g −1 s −1 Pa −1 ), and both the moisture content and water contact angle were significantly decreased. Furthermore, the incorporation of TP enhanced the antioxidant properties of the composite films and demonstrated the slow-release capability of TP. Blueberry fruits packaged in PE-TP-GO film maintained an optimal appearance after eight days of storage at 25 °C, with a reduction in shrinkage index of approximately 29.4 % compared to those packaged in PE film.
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jiayun Guo,Shuyi Ma,Gege Fan,Ping Ni,Nina Ma,Yinyue Wang,Jiamin Zhu,Heng Wang
In this paper, NdFeO 3 nanofibers were synthesized by the electrospinning method for the first time and used for the detection of triethylamine. XRD, SEM, TEM, BET, XPS, and gas-sensitive test instruments were used to detect the morphology, structure, and gas-sensitive properties of the synthesized products. The results show that the average diameter of the nanorods is about 275 nm. The specific surface area is 10.298 m 2 /g, the total pore volume is 0.112 cm 3 /g, and the average pore diameter is 43.469 nm. Gas sensing tests were carried out on NdFeO 3 nanofibers. The gas-sensitized element was found to have a low optimal operating temperature of 190 °C. The response to 100 ppm triethylamine was 18.9. The response time and recovery time were 72 and 35 s, respectively. A series of test results showed that the sample had excellent selectivity, reproducible detection, long-term stability, and a low detection limit for triethylamine. It has a lot of potential for practical TEA monitoring and detection.
研究领域:
材料科学
·
传感器技术
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DOI
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2025
·
IF 3.5
Hui Zhu,Tao Sheng,Yujie Wu,Mei Cheng,Hui Li,Yanzhe Dai,Jian Wei,Sijian Zhou,Qi Chen,Yibin Zhou
BACKGROUND Green tea contains a variety of beneficial ingredients. However, the loss of its active ingredients under improper storage conditions will reduce the overall value. In this study, H-GT (Huangshan Maofeng tea) and L-GT (Lu'an Guapian tea) were stored at 25, 8, 4, 0 and −20 °C for 300 days. The impact of different storage temperatures on green tea quality was evaluated by analyzing changes in physicochemical properties, taste-related constituents and antioxidant capacity. RESULTS During storage, the intrinsic components and antioxidant activity of both green teas changed markedly. The total catechin content decreased continuously, while theanine content initially increased before declining. In terms of antioxidant activity, both ABTS radical scavenging rate and FRAP reducing power initially rose and then fell, whereas DPPH radical scavenging rate steadily decreased. Furthermore, antioxidant capacity showed significant positive correlations ( R 2 > 0.65) with specific compounds: EGCG, CAF and GC in H-GT, and EGCG, ECG, EGC, CAF, Asp and Phe in L-GT. Based on kinetic modeling of these key components, it was found that the storage stability of both teas was optimal under dry-zone (4 °C) and frozen-zone (−20 °C) conditions, which most effectively preserved their quality and bioactivity. CONCLUSION After 300 days of storage, the dry storage zone (4 °C) not only showed excellent preservation performance but also offered lower storage costs, making it the optimal condition for the long-term storage of green tea. This study contributes to establishing a comprehensive database for dry-stored green tea under refrigeration and provides a scientific basis for low-temperature, dry-zone storage strategies. © 2025 Society of Chemical Industry.
研究领域:
食品科学
·
植物生物化学
·
采后技术
·
抗氧化研究
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DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Bing Wang,Yonglin Wang,Ming Cui,Ting Yu,Zurong Du,Wanfu Wang,Pengbo Lyu
Lead-free copper halides have emerged as promising candidates for solid-state lighting, yet many reported systems still face challenges of limited efficiency, severe self-absorption, or insufficient device stability. Here, we report the synthesis of transparent millimeter-sized single crystals of (C8H20N)2Cu2Br4 (TEA2Cu2Br4) via a facile antisolvent-assisted evaporation method. Structural analysis confirmed that bulky TEA+ cations encapsulate [Cu2Br4]2− units, forming a spatially confined low-dimensional framework that promotes efficient radiative recombination of self-trapped excitons (STEs). TEA2Cu2Br4 exhibits deep-blue emission at 478 nm with a large Stokes shift of 166 nm, a long photoluminescence lifetime of 54 µs, and an ultrahigh PLQY of 98%. The material demonstrates remarkable robustness against continuous illumination, thermal cycling, electrical bias, and ambient exposure, with decomposition occurring only above 300 °C. Furthermore, ultraviolet-excited WLEDs fabricated by integrating TEA2Cu2Br4 with CsCu2I3 deliver balanced white emission with CIE coordinates of (0.3175, 0.3593), a correlated color temperature of 6138 K, and retain 93.8% of their initial electroluminescence intensity after 20 days of continuous operation. These results highlight TEA2Cu2Br4 as a structurally well-defined, high-performance hybrid copper halide with strong potential for environmentally friendly solid-state lighting.
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高影响因子
Foods
·
2025
·Vol. 14
·期 24
·4337
·
IF 5.1
Zhiwen Hu,Zhenzhen Wu,Lingxin Yu,Shuyi Zou,Yaxuan Hu,Tengjun Jiang,Yanlei Lin,Yueyue Cai,Qibiao Weng,Jie Pang,Jiebo Chen
Tea polyphenols (TPs) are promising natural bioactive compounds; however, their practical application is hindered by poor stability and low bioavailability. To address this challenge, we synthesized TP–iron nanoparticles (TP-Fe NPs) through coordination-driven self-assembly. Comprehensive characterization (SEM, TEM, FTIR, and XRD) confirmed the successful formation of stable TP-Fe NPs, primarily mediated by phenolic hydroxyl and carbonyl groups. Among TP-Fe NPs, the TP3-Fe1 NPs exhibited superior performance, achieving DPPH and ABTS radical scavenging rates of 65.71% and 89.64%, respectively, and inhibition rates of 91.44% against E. coli and 88.67% against S. aureus . Furthermore, TP3-Fe1 NPs demonstrated excellent biocompatibility, showing no significant cytotoxicity to L929 cells at 0.01–0.1 mg/mL. These findings highlight the potential of TP3-Fe1 NPs as a safe and effective material with dual functionality for antioxidant and antibacterial applications.
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PubMed
高影响因子
ACS Applied Bio Materials
·
2020
·
IF 0
Min Mu,Yuelong Wang,Shasha Zhao,Xiaoling Li,Rangrang Fan,Lan Mei,Min Wu,Bingwen Zou,Na Zhao,Bo Han,Gang Guo
Chemotherapy works against tumors by inducing cell apoptosis; however, evasion of apoptosis is recognized to result in resistance to anticancer therapy. Ferroptosis is an iron-dependent cell death pathway that differs from apoptosis in morphological, biochemical, and genetic levels. Combined ferroptosis and apoptosis may shed light on strategies for cancer treatment. Therefore, we have designed a nanoparticle (NP) that can simultaneously cause tumor cell apoptosis and ferroptosis. This NP is composed of epigallocatechin gallate (EGCG) and Fe3+ through a simple and green process and can be used to deliver doxorubicin hydrochloride (DOX) and iron ions to the tumor site at the same time. DOX/Fe3+/EGCG (DF) NPs display a great resolubility and long-term storage stability, and efficient DOX and Fe3+ release is realized after cellular internalization under the high level of glutathione and acidic nature in tumor. EGCG is likely to chemically reduce the released Fe3+ to Fe2+. The generated Fe3+/Fe2+ converts intracellular H2O2 to hydroxyl radicals (•OH) via the Fenton reaction. In addition, the generated •OH subsequently induces lethal ferroptosis to improve DOX-induced apoptosis. In vitro and in vivo investigations indicate that a great therapeutic effect was achieved, suggesting that the formation of the DF NP delivery system is a promising strategy to fight against tumors by an apoptosis and ferroptosis combination modality.
研究领域:
纳米技术
·
癌症生物学
·
药学科学
·
材料科学
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DOI
PubMed
AMERICAN JOURNAL OF NEPHROLOGY
·
2023
·
IF 4.2
Shi Heng,Zhao Xinhai,Peng Qin,Zhou Xianling,Liu Sisi,Sun Chuanchuan,Cao Qiuyu,Zhu Shiping,Sun Shengyun
Introduction: Di(2-ethylhexyl) phthalate (DEHP) is a common plasticizer. Studies have revealed that DEHP exposure can cause kidney damage. Green tea is among the most popular beverages in China. Green tea polyphenols (GTPs) have been proven to have therapeutic effects on organ damage induced by heavy metal exposure. However, few studies have reported on GTP-relieving DEHP-induced kidney damage. Methods: C57BL/6J male mice aged 6–8 weeks were treated with distilled water (control group), 1,500 mg/kg/d DEHP + corn oil (model group), 1,500 mg/kg/d DEHP + corn oil + 70 mg/kg GTP (treatment group), corn oil (oil group), and 70 mg/kg GTP (GTP group) by gavage for 8 weeks, respectively. The renal function of mice and renal tissue histopathology of each group were evaluated. The renal tissues of mice in the model, treatment, and control groups were analyzed using high-throughput sequencing. We calculated the differentially expressed microRNAs (miRNAs) and messenger RNAs (mRNAs) using the limma R package, the CIBERSORT algorithm was used to predict immune infiltration, the starBase database was used to screen the miRNA-mRNA regulatory axis, and immunohistochemical analyses were performed to verify protein expression. Results: GTP alleviated the deterioration of renal function, renal inflammation and fibrosis, and mitochondrial and endoplasmic reticulum lesions induced by DEHP in mice. Differential immune infiltrations of plasma, dendritic, T, and B cells were noted between the model and treatment groups. We found that three differentially expressed miRNAs (mmu-miR-383-5p, mmu-miR-152-3p, and mmu-miR-144-3p), three differentially expressed mRNAs (Ddit4, Dusp1, and Snx18), and three differentially expressed proteins (Ddit4, Dusp1, and Snx18) played crucial roles in the miRNA-mRNA-protein regulatory axes when GTPs mitigate DEHP-induced kidney damage in mice. Conclusion: GTP can alleviate DEHP-induced kidney damage and regulate immune cell infiltration. We screened four important miRNA-mRNA-protein regulatory axes of GTP, mitigating DEHP-induced kidney damage in mice
研究领域:
毒理学
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药理学
·
分子生物学
·
免疫学
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Sainan Wang,Pengchang Liu,Yongmei Qin,Zhijun Chen,Jiacong Shen
In this report, a rapid approach for the synthesis of protein conjugated gold nanoclusters under heating condition (AuNCs-protein(p)-heating(h)) was proposed. These AuNCs-p-h were synthesized within 3 min at approximately 100 °C and contain remarkable peroxidase-like activity. Notably, in the presence of tea polyphenols (TPs), the peroxidase-like activity of AuNCs-p-h is restrained, which is likely due to the TP-induced aggregation. A facile approach for TP sensing based on the inhibition effect of TPs towards the peroxidase mimic activity of AuNCs-p-h has been developed. Tea is one of the most popular and health beneficial beverages, the favourable effect of which attributes greatly to its key component, TPs. TP detection thus becomes an important task for various food and beverage companies. This novel TP colorimetric detecting method exhibits a linear response in the concentration range of 10 nM to 10 μM with detection limit of 10 nM as well as prominent selectivity towards various TP related molecules including tyrosol, protocatechuate, chlorogenic acid, theophylline, l -theanine, and l -norepinephrine hydrochloride. Comparing with the traditional tartaric acid colorimetric approach (Tac), this new system shows basically identical experimental results but with much higher sensitivity. AuNCs-p-h can be readily used for TP quantification from real tea samples.
研究领域:
纳米技术
·
分析化学
·
食品科学
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DOI
高影响因子
Food Bioscience
·
2022
·
IF 5.318
Su Zhou,Jiaying Chen,Shiyan Yang,Yani Pan,Xinyu Feng,Shicheng Ma,Fangyuan Fan,Shuying Gong,Yuefei Wang,Ping Chen,Qiang Chu
Non-alcoholic fatty liver disease (NAFLD) is a clinical syndrome associated with steatosis and excessive deposition in the liver, while safe, green and efficient curative therapy is still lacking. Current researches have shown that plant polyphenols possess superior lipid-lowering and liver protective activities. Pu'er raw tea, a widely consumed tea with increasing fans, has been reported with various healthcare functions, such as blood lipids-lowering, weight loss, anti-microbes and anti-cancer. Therefore, in this study, polyphenols were extracted, purified and identified from Pu'er raw tea. The beneficial effects of Pu'er raw tea extract (PTE) on lipidoses in both LO2 cells and Caenorhabditis elegans were investigated. In vitro , PTE manifested beneficial effects in protecting cells from oxidative stress , alleviating lipid accumulation and expression of metabolic transcription factors such as Pparα, CD36 , Plin2, Scd1, and activating the SIRT1-FOXO pathway to inhibit the expression of SREBP-1c and FAS. In vivo , PTE regulated the abnormal athletic ability of C. elegans and inhibited lipidosis in the whole body induced by oleic acid (OA). Therefore, PTE has exhibited superior bioactivity in alleviating lipid deposition both in vivo and in vitro , and could be regarded as a potential therapeutic strategy for NAFLD in the future.
研究领域:
药理学
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分子生物学
·
营养学
·
细胞生物学
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DOI
高影响因子
JOURNAL OF FOOD BIOCHEMISTRY
·
2021
·Vol. 45
·期 5
·e13689
·
IF 2.72
Minghao Fan,Yilin Qian,Wei Yue,Yuqi Yang,Xin Zhang,Shuang Ma,Ying Xu,Dongfeng Wang
The preparation method and the sources of metal elements may affect the activity of the metal–polysaccharide complex. In this study, four Fe–tea polysaccharide complexes were prepared and three tea polysaccharides (TPSs) from different seasons were extracted. Moreover, the binding mode of TPSs with internal and external metallic elements as well as their inhibitory effect on α-glucosidase was explored. The results revealed that the binding mode (–C–O–Fe and –C–Fe) of the Fe–TPS complex prepared at pH 5.0 was closer to TPS with internal metallic elements. The TPS with the least amount of internal metallic elements (61.72 mg/g) exhibited a high inhibitory activity on α-glucosidase (37.90%). The inhibitory activity of Fe–TPS on α-glucosidase was lower than that without Fe. But the quenching effect and the inhibition type of TPSs on α-glucosidase were not affected by metallic elements. Therefore, the metallic elements have the potential to reduce the hypoglycemic activity of TPS. Practical applications In this paper, TPS was extracted from crude tea in different seasons, and the effects of metallic elements in TPS on hypoglycemic activity, physicochemical properties, and structure of TPS were discussed. TPS metal complexes were prepared by adding Fe 3+ or removing metallic elements, and the differences of internal metallic elements in TPS were discussed. It is of great academic significance to use tea pruned leaves and crude tea as potential resources to develop polysaccharide hypoglycemic products and to reveal the relationship between TPS metal ions and their structure and activity. In addition, it has guiding value for consumers to choose tea-producing regions and growers to choose chemical fertilizer.
研究领域:
食品科学
·
生物化学
·
药学
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DOI
PubMed
高影响因子
npj Science of Food
·
2026
·
IF 9.7
Guo Longyu,Li Weixuan,Zeng Jianming,Zhu Yinglin,Yan Han,Zhang Yue,Lv Haipeng,Lin Zhi,Yu Liaoyuan,Zhu Yin
High-quality black tea is globally prized for its characteristic aromas, notably “floral” and “sweet” notes. The tea cultivar serves as the genetic foundation for the development of these signature scents. Therefore, precise identification of key odorants across different aroma types is scientifically essential to guide the targeted breeding of superior aromatic tea cultivars. In this study, two widely cultivated national tea cultivars—“Jinmudan” (JMD) and “Fuding Dabaicha” (FDDB)—along with a distinctive national cultivar, “Zhongcha 102” (ZC102), derived from the Longjing population, were consistently processed into black tea. Sensory evaluation combined with quantitative descriptive analysis revealed that JMD exhibited pronounced “floral” and “fruity” notes, whereas ZC102 and FDDB displayed a “high and sweet” aroma profile. Systematic sensomics analysis identified 78 odorants across the three black teas and highlighted several key aroma enhancers: linalool and cis -3-hexenyl butyrate were found to intensify the “floral” attribute; 2-phenyl-2-butenal and geraniol contributed significantly to the “sweet” scent; and 2-ethyl-3,5-dimethylpyrazine was a key contributor to the more pronounced “roasted” note of ZC102 black tea. Molecular docking suggested that trans - β -damascenone, 2-phenyl-2-butenal, and trans - β -ionone may exhibit broad affinity for multiple olfactory receptors, with binding energies as low as −8.1 kcal/mol. Furthermore, linalool, cis -3-hexenyl butyrate, and 2-ethyl-3,5-dimethylpyrazine were found to bind most stably with OR1A1, OR8D1, and OR1A1, respectively. The activation of olfactory receptors was primarily predicted to be governed by hydrogen bonds, with hydrophobic interactions (e.g., Pi-Pi stacking, Pi-sulfur) also possibly playing important roles. This study provides a theoretical basis for precise aroma regulation in black tea through targeted cultivar selection and processing.
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高影响因子
危险品化学品经营许可证（带存储）