JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2023
·
IF 6
Chengxuan Zhou,Danni Deng,Chao Huang,Yu Xie,Hang Dong,Yujiao Wen,Bo Li,Zhi Zhou,Wei Luo,Zhonghua Zhou
The search for cost-effective, high-performance catalysts is crucial in catalytic co-pyrolysis. Different Fe-Mo@X catalysts (X = Al 2 O 3 , MgO) and reaction temperatures (600 ℃, 700 ℃, 800 ℃, 900 ℃) were tested to optimize hydrogen production and carbon quality while also exploring CNTs degradation performance. The results indicate that both catalyst type and operating parameters are highly dependent on the growth of carbon nanotubes and hydrogen. The FeMo@Al 2 O 3 catalyst exhibits superior catalytic activity attributed to its more abundant mesoporous structure and higher specific surface area. Specifically, FeMo@Al 2 O 3 achieved the highest yield of carbon nanotubes (84.42%) at 700 ℃, and attained the maximum hydrogen yield (49.57%) at 900 ℃. However, the CNTs synthesized from FeMo@MgO exhibited fewer defects, higher graphitization degree and purity (Raman and TPO). CNTs/MgO significantly enhanced the degradation efficiency of Clothianidin by virtue of their superior electron transport properties and chemical bonding between MgO and CNTs.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2023
·
IF 6.8
Yue Wang,Guojun Pan,Tingjie Huang,Tao Zhang,Jin Lin,Lubin Song,Guangshuo Zhou,Xiaoping Ma,Yanqing Ge,Yongyu Xu,Chunhao Yuan,Nan Zou
Pesticide stress on plants is receiving increased scrutiny due to its effect on plant secondary metabolism and nutritional quality. Tannic acid (TA) is a natural polyphenolic compound showing excellent antioxidant properties and is involved in alleviating stress. The present study thoroughly investigated the effects and mechanism of exogenous TA on relieving imidacloprid (IMI) stress in tea plants. Our research found that TA(10 mg/L) activated the antioxidant defense system, enhanced the antioxidant ability, reduced the accumulation of ROS and membrane peroxidation, and notably promoted tea plant tolerance to imidacloprid stress. Additionally, TA boosted photosynthetic capacity, strengthened the accumulation of nutrients. regulated detoxification metabolism, and accelerated the digestion and metabolism of imidacloprid in tea plants. Furthermore, TA induced significant changes in 90 important metabolites in tea, targeting 17 metabolic pathways through extensively targeted metabolomics. Specifically, TA activated the flavonoid biosynthetic pathway, resulting in a 1.3- to 3.1-fold increase in the levels of 17 compounds and a 1.5- to 63.8-fold increase in the transcript level of related genes, such as ANR , LAR and CHS in this pathway. As a potential tea health activator, TA alleviates the oxidative damage caused by imidacloprid and improves the yield and quality of tea under pesticide stress.
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JOURNAL OF MOLECULAR STRUCTURE
·
2023
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IF 3.8
Na Li,Baijian Feng,Yongguang Bi,Fansheng Kong,Zhong Wang,Shaofan Tan
Tea polyphenols (TP) is popular due to strong biological activity, however, the instability of TP limits its application. In this study, inclusion complexes (TP-SBE) of TP with sulfobutyl ether β-cyclodextrin (SBE) were synthesized to improve the stability and bioactivity of TP. To retain more active components and obtain powder with good morphology, TP-SBE was prepared by freeze-drying and characterized by Ultraviolet-visible, Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy, Thermogravimetric-differential scanning calorimetry and X-ray Diffraction Spectroscopy, which showed that the TP was successfully encapsulated by SBE and the thermal stability was improved. The effects of mass ratio, inclusion temperature, stirring speed, and inclusion time on the encapsulation rate of the synthesized TP-SBE were also determined, and the encapsulation rate reached 98.29% ± 1.65% under the optimal conditions. The in vitro activity assay showed that the IC 50 of TP-SBE on 2,2-Diphenyl-1-picrylhydrazyl and 2,2-Azinobis-(3-ethylbenzthiazoline-6-sulphonate) was 16.24±0.99 μg/mL and 5.13±0.17 μg/mL, and the scavenging effect on free radicals and α-glucosidase was more substantial than that of TP. The release of TP slowed down by SBE encapsulation and showed pH-selective. These data suggested that TP can be developed as a nutraceutical with antioxidant and hypoglycemic properties.
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JOURNAL OF FOOD SCIENCE
·
2021
·Vol. 86
·期 3
·813-823
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IF 3.167
Wei Chen,Dandan Qi,Wenwen Wang,Aiqing Miao,Chengying Ma
The study was aim to investigate the effects of grafting on volatile compounds and sensory quality of black tea. Seven groups of black tea were prepared from one nongrafted tea tree “Yinghong9 (YJ)” and six grafted tea trees by grafting scion of “YingHong9” on different rootstocks. Sensory analysis indicated marked/slight variations among seven samples, among which, the one grafting on HuangZhiXiangDanCong (HZX) stood out with floral and fruity aroma. The result of chemometrics analysis suggested various effects on compounds caused by different rootstocks. A total of 38 differential compounds were identified, showing mainly quantitative variations, with 36 being identified in all samples. The significant higher contents of volatiles, such as geraniol, phenylethyl alcohol, ( E )-nerolidol, decanal, and linalool oxides, in HZX compared with YJ were observed, which explained why floral and fruity aroma stood out among the whole aroma profile of HZX. Both results of sensory and instrumental analysis suggested certain correlation between compound variations and aroma characteristics. Moreover, different rootstocks influenced the aroma quality in different ways. Practical Application In conclusion, the study illuminates the various effects of grafting on the volatile compounds and aroma quality, which enlightens the possibility of changing aroma quality of black tea by grafting scions on different rootstocks. And thus, it can help guide the practical production when cultivating new varieties.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2021
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IF 4.952
Yuchuan Li,Chang He,Xinlei Yu,Jingtao Zhou,Wei Ran,Yuqiong Chen,Dejiang Ni
This study investigated the influence mechanism of red-light withering on the taste quality of black tea. Compared with natural withering (control), red-light withering (RLW) can significantly improve the taste quality of the summer-autumn black tea by reducing its bitterness and astringency . Specifically, RLW was shown to have a greater impact on the amino acids and theaflavins of tea, with an increase of 10.6% and 25.6% in their content after RLW, respectively. The increase in amino acid content is mainly attributed to the content increase of the protein-amino acids induced by the up-regulated expression of phenylalanine and tryptophan synthesis genes as well as the activity of peptidases. Additionally, RLW can inhibit the down-regulation of key genes in catechin synthesis to increase the content of partial catechins (EGC and GCG). Meanwhile, RLW can also significantly increase the enzyme activity of polyphenol oxidase and peroxidase and promote the formation of theaflavins in the fermentation stage. This study provides a theoretical basis for improving black tea withering technology and withering equipment.
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Journal of Cleaner Production
·
2020
·
IF 7.246
Feng Zheng,Yanchun Li,Zhixiang Zhang,Jinliang Jia,Pengtong Hu,Chaoqun Zhang,Hanhong Xu
Improving rainfastness of agro-chemicals on leaves to reduce chemical leaching onto the ecosystem and aerosol drift is a huge challenge in modern agriculture and environmental protection. In this study, tea saponin (TS), a natural product and efficient bio-pesticide, was blended with environmentally-friendly vegetable oil-based waterborne polyurethanes . The chemical structures, mechanical properties, thermal stability, slow-release behavior of the composite films with different TS contents and the inhibitory effect of composites on mycelia growth of rice blast were studied. It is found that the release rate of TS from the composite films could be tailored by controlling the TS content of the composite emulsion. The composites prepared exhibit excellent inhibitory effect on the mycelia growth of rice blast, even after rainfall washing. This is the first time that bio-based and degradable polymer films with sustained-release of TS are proposed to control rice blast diseases with enhanced rainfastness.
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FOOD CHEMISTRY
·
2020
·
IF 6.306
Congcong Yu,Dongyu Hao,Qiao Chu,Ting Wang,Songnan Liu,Tao Lan,Fenghe Wang,Canping Pan
Tea polyphenols, chlorophyll and lutein generally cause strong matrix effects and challenge analysis of trace substances in tea. Seven frequently used adsorbents were chosen to test removal ability for tea polyphenols, chlorophyll and lutein based on the adsorption isotherm fitting. Results showed that MWCNTs-NH 2 demonstrated the strongest removal ability, which may be ascribed to the π-π and electrostatic interaction. Then a method of MWCNTs-NH 2 modified QuEChERS coupled with HPLC-MS/MS detection of 10 organophosphorus pesticide residues in tea was developed and validated. Unlike traditional QuEChERS, only one adsorbent (MWCNTs-NH 2 ) was applied in this method to replace the combined effect of various adsorbents, which improved the easiness and generality of the method. The LOQs were 1.7–9.0 µg/kg. The average recovery rate ranged from 72% to 116% with RSDs less than 14%. This study provides a targeted strategy to develop analysis method for trace substances in a complicated matrix.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
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IF 4.098
Yujiao Wang,Qingyu Guo,Xingyi Wu,Haixiang Gao,Runhua Lu,Wenfeng Zhou
In this study, a novel FONs-based sensor P-M(w) was synthesized using 1-Pyrenecarboxaldehyde and L-methionine through facile hydrothermal strategy. The fluorescence emission peaks of the acquired P-M(w) would show specific changes after the addition of Hg 2+ due to interfering the PET process and inducing nano-structure conformational rigidification of P-M(w). Notably, the water-soluble FONs-based sensor was firstly used to detect Hg 2+ in tea samples providing a new material choice for the fluorescence sensor construction of metal ion detection. Besides, the qualitative and quantitative analysis of Hg 2+ could be carried out with P-M (w) at a very low concentration (1 μg/mL) meaning that the acquired P-M(w) synthesized by few grams of reactants may satisfy the detection of approximate fifty thousand samples.
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ULTRASONICS SONOCHEMISTRY
·
2021
·
IF 7.491
Anand Babu Perumal,Xiaoli Li,Zhenzhu Su,Yong He
Blast is one of the most devastating fungal diseases of rice caused by Magnaporthe oryzae . Plant essential oil (EO) can function as antifungal agents and are regarded as a safe and acceptable method for plant disease control. However, EOs are unstable and hydrophobic, which limits its use. In the present study, we aimed for the preparation and characterization of a nanoemulsion (NE) from green tea essential oil (GTO) by ultrasonication method and determined the antifungal activity of NE on M. oryzae . The particle size and zeta potential of the NE were 86.98 nm and −15.1 mV, respectively. The chemical composition and functional groups of GTO and NE were studied by using GC–MS analysis, portable Raman spectroscopy, and FTIR coupled with chemometric analysis. GC–MS analysis showed the major components in GTO and NE were n-Hexyl cinnamaldehyde and L-α-Terpineol. Both GTO and NE showed good antioxidant activity and total phenol content. Moreover, the NE showed good antifungal activity against M. oryzae which was further confirmed by scanning electron microscopy (SEM) examination. Also, confocal Raman micro-spectroscopy (CRM) revealed the antifungal mechanism of GTO and NE on M. oryzae which proves the cell damage. To the best of our knowledge, this is the first study on the antifungal activity of GTO and NE against M. oryzae and also the use of CRM for the evaluation of the chemical changes in single fungal hyphae in a holistic approach . This study suggests that the prepared NE could be a potential candidate for use as a substitute for synthetic fungicides.
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RSC Advances
·
2019
·Vol. 9
·期 48
·28006-28018
·
IF 3.049
Huanhuan Xu,Titi Liu,Jing Xu,Jin Li,Fei Chen,Zemin Xiang,Yewei Huang,Dongying Zhang,Lihong Hu,Banglei Zhang,Chengting Zi,Xuanjun Wang,Jun Sheng
Galloylated catechins, the most important secondary metabolites in green tea including (−)-epigallocatechin-3-gallate (EGCG) and (−)-epicatechin-3-gallate, constitute nearly 75% of all tea catechins and have stronger health effects than non-galloylated catechins such as (−)-epigallocatechin and (−)-epicatechin. EGCG is the most abundant, active, and thoroughly investigated compound in green tea, and its bioactivity might be improved by complexing with β-cyclodextrin (β-CD). We investigated interactions between four catechins and β-CD in a PBS buffer solution of pH 6.5 at 25 °C using biolayer interferometry and isothermal titration calorimetry, and to determine whether β-CD could enhance the anti-osteoclastogenesis effect of EGCG. β-CD could directly bind galloylated catechins at a stoichiometric ratio close to 1 : 1, with high specificities and affinities, and these inclusion interactions were primarily enthalpy-driven processes. We synthesized the EGCG–β-CD complex and identified it using infrared radiation and nuclear magnetic resonance spectra. Interestingly, we revealed that the EGCG–β-CD complex could inhibit osteoclastogenesis significantly more than EGCG.
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MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Yanmei Shi,Kai Hu,Yongxia Cui,Jiamin Cheng,Wenjie Zhao,Xiumin Li
A magnetic triptycene-based CTF (M-CTF-TPC) has been synthesized by a covalent bonding method, and was characterized by scanning electron microscopy, transmission electron microscopy , X-ray diffraction, and nitrogen adsorption-desorption isotherms. The M-CTF-TPC exhibits the properties of high porosity, large surface area and strong magnetism. The extraction conditions were optimized, and a novel method coupled with magnetic solid phase extraction (MSPE) and ultra-performance liquid chromatographic analysis-fluorescence detection (UHPLC-FLD) was established the analysis of anthraquinones . The enrichment factors for the proposed method were 72.8–88.6, and the limits of detection for the five anthraquinones were found to be in the range of 0.010–0.077 μg g −1 . The proposed method was applied to the determination of anthraquinones in slimming tea with satisfactory recoveries (94.5–105.4%) and lower RSDs (3.0–5.8%), demonstrating its excellent accuracy. These results suggest that the promising potential of M-CTF-TPC as sorbent in sample pretreatment.
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MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Liping Du,Chao Wang,Chenxia Zhang,Lijuan Ma,Yongquan Xu,Dongguang Xiao
Volatile compounds and sensory characteristics of instant Pu-erh teas (IPET) produced through the spray-drying process were evaluated by using headspace solid-phase microextraction (HS-SPME) combined with comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry (GC × GC-TOFMS) and descriptive sensory analysis (DSA), and compared with Pu-erh tea (PET). A total of 208 and 204 volatiles were identified in IPET and PET, respectively. Through independent samples t -test, 98 and 55 compounds showed highly significant differences ( P ≤ 0.01) and significant differences (0.01 < P ≤ 0.05) between IPET and PET, respectively. Meanwhile, 158 compounds were defined to interpret the differences between IPET and PET using variable importance in the projection (VIP) value. Moreover，seven aroma attributes were identified through DSA. The results showed that IPET had the higher intensity of floral, fruity, sweet, and caramel-like descriptor, while PET demonstrated higher intensity of stale/musty and woody attributes.
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