FOOD CHEMISTRY
·
2022
·
IF 9.231
Yuhang Hu,Xuhui Kan,Tingting Yang,Xia Fan,Wangting Zhou,Guijie Chen,Yamei Yan,Lu Lu,Jia Mi,Xiaoxiong Zeng,Youlong Cao
Chlorogenic acids are important phenolics in the fruits of wolfberry, but little attention has been paid on their glucosylated forms. In the present study, a glucosylated form of chlorogenic acid was isolated from the fruits of Lycium barbarum L. var. auranticarpum K. F. Ching (also called yellow wolfberry) and identified to be (-)-5- O -(3- O -β- d -glucopyranosylcaffeoyl)-quinic acid (5-CQA-3′βG) by high resolution mass spectrometry and nuclear magnetic resonance spectrometry. The content of 5-CQA-3′βG in the dried fruit was determined as 0.0293 ± 0.0015% by HPLC. In addition, 5-CQA-3′βG showed a good scavenging capacity for 2,2′-azino-bis-(3-ethylben-zothiazoline-6-sulphonate) free radicals but had a relatively low reducing power and scavenging capacity for 2,2-diphenyl-1-picrylhydrazyl free radical. Moreover, the secretion of nitric oxide, tumor necrosis factor-α and interleukin-6 as well as related mRNA expression were reduced in lipopolysaccharide-stimulated RAW264.7 macrophage cells treated with 5-CQA-3′βG. This is the first report describing purification, identification and bioactivity of glucosylated CQA from yellow wolfberry.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Ting Pan,Baohua Yue,Liuming Yan,Guangbo Zeng,Yidong Hu,Shufa He,Wei Lu,Hongbin Zhao,Jiujun Zhang
Novel functionalized polysulfone with high local density of sulfonic acid groups, N , N -bis(sulfopropyl)aminyl-4-phenyl polysulfone or O , O′ -bis(sulfopropyl)resorcinol-5-yl-4-phenyl polysulfone (PSF-X-C 3 H 6 SO 3 H, X = N or O) are synthesized. These polymers are synthesized by bromination of polysulfone followed by Suzuki cross-coupling reaction to graft the aminophenyl groups and the dimethoxyphenyl groups onto the polymeric backbone, followed by introduction of the sulfopropyl groups via sultone ring-opening reaction. In addition, the composite membrane of PSF-O-C 3 H 6 SO 3 H and PSF-N-C 3 H 6 SO 3 H is also synthesized for comparison. The maximum proton conductivity of composite PSF-O-C 3 H 6 SO 3 H and PSF-N-C 3 H 6 SO 3 H reaches 46.66 mS cm −1 at 95 °C and 90% RH, higher than PSF-O-C 3 H 6 SO 3 H (42.06 mS cm −1 ) and PSF-N-C 3 H 6 SO 3 H (38.76 mS cm −1 ). Meanwhile, the composite exhibits compromised water uptake and swelling ratio, and low methanol permeability . The excellent overall performance of the composite is attributed to phase-separation between the hydrophilic and the hydrophobic subphases, and the hydrogen-bonding network developed in the hydrophilic subphases.
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Shilian Lai,Jingyan Zhu,Weibing Zhang,Jun Jiang,Xinhua Li
Supercapacitors are widely used in power reserves and portable power devices because of their rapid charge and discharge rates and excellent cycle performance. Carbon materials have the characteristics of large specific surface areas, excellent electrical conductivity, good chemical stability, and low price, so they are very attractive as electrode materials for supercapacitors. In recent decades, the electrochemical properties of supercapacitors based on porous carbon have attracted much interest. Through the design of supercapacitors of reasonable appearance, pore shape, and surface characteristics, their electrochemical performance has been significantly improved. Herein, a simple and easy process is developed to synthesize a new kind of porous carbon materials with N,O-doping. The constructed supercapacitor with the as-prepared carbon material exhibits excellent capacitance performance and rapid charge and discharge rates (<1 s, 20 A/g, two-electrode cell), ultralong cycle life (>89,000 cycles, 10 A/g), large specific capacitance (276.5 F/g, 0.5 A/g), and excellent energy density (38.4 W/h/kg). Its superior properties make it one of the best candidate electrode materials for supercapacitors derived from ligands. Its excellent supercapacitor performance is probably related to its high ion-accessible specific surface area, hierarchical regular pore structure, and well N,O-doping on the surface of the carbon composite. This study provides a feasible strategy for the development of high-performance supercapacitors suitable for commercial applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Lihong Wei,Yao Zhang,Jinyuan Jiang,Yinbo Yang,Hui Liu
In this work, the Br functional group on the ligand UiO-66-Br was modified with a Bi–O bond through the secondary solvothermal method, and the synthesis method of visible light catalyst UB (UiO-66-BiOBr) with high electron mobility was explored. The findings indicate that the effective charge transfer of the functional group-modified material UB is 2.98 times and 1.22 times that of BiOBr and traditional UiO-66/BiOBr heterojunctions, respectively. Under simulated sunlight irradiation, the removal rate of tetracycline can reach 88.71%, and the photocatalytic performance is 22.73 times higher than that of UiO-66-Br. Moreover, it maintains good adsorption and photocatalytic performance under different laboratory and actual engineering water environment conditions. In the complex water environment of municipal wastewater, the degradation effect reaches more than 80%. Finally, the decomposition pathways of TC and ecotoxicities of the intermediates were analyzed via combining theoretical calculation, LC–MS/MS, and T.E.S.T.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Siyi Li,Pinyi Wang,Jianyun Hu,Guangcan Yang,Youjun Lu,Zhenxia Yuan,Xiao Zhang,Sen Liang
γ-AlOOH nanopowder synthesized using hydrothermal-assisted freeze-drying was employed as a precursor, with AlF₃ as a sintering aid, to explore the preparation of α-Al₂O₃ with a high specific surface area at elevated temperatures. The γ-AlOOH nanopowder produced in this study exhibited superior dispersion, achieving a specific surface area of 198.06 m 2 /g and a zeta potential of 45.8 mV. At a calcination temperature of 1200 °C, the resulting α-Al₂O₃, synthesized from γ-AlOOH and AlF₃, maintained a specific surface area of 27.72 m 2 /g, significantly higher than the typical values reported in the literature (generally below 10 m 2 /g). The α-phase purity exceeded 99 %, and the [AlO₆] proportion was 95.07 %. Furthermore, at a calcination temperature of 1150 °C, the specific surface area of the α-Al₂O₃ reached 50.48 m 2 /g. Using this α-Al₂O₃ as a carrier, a composite TiO₂ catalyst was prepared via a sol-gel and hydrothermal method. This catalyst demonstrated a photocatalytic degradation rate of over 98 % for rhodamine B (10 mg/L) within 30 min of irradiation, under the illumination of a 300 W mercury lamp in proximity to the light source.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
·
2018
·
IF 3.562
Juping You,Mine Du,Han Chen,Xinying Zhang,Shihan Zhang,Jianmeng Chen,Zhuowei Cheng,Dongzhi Chen,Jiexu Ye
A new isolate identified as Rhodococcus sp. ZJUT312 via taxonomic and 16S rRNA analysis was used for the efficient degradation of benzene, toluene, ethylbenzene, and xylene (BTEX). The strain ZJUT312 was able to degrade all the BTEX. Their average biodegradation rates followed the order o -xylene > ethylbenzene > toluene > benzene > m -xylene > p -xylene. The degradation rate of o -xylene reached as high as 0.117 mmol L −1 h −1 , which was one to two orders of magnitude higher than that of all other reported o -xylene degrading bacteria. GC-MS analysis revealed that o -xylene degradation pathway mainly proceeded with 2-methylbenzylalcohol as an intermediate and CO 2 as a final product. Mass balance analysis of the carbon element indicated that approximately 59% the o -xylene carbons were transferred to cell biomass and about 20% were mineralized into CO 2 . Furthermore, the o -xylene degradation kinetics fitted well with Haldane's model. The maximum specific degradation rate (0.953 h −1 ) was approximately 2.25 times higher than the reported data in the literature.
研究领域:
环境生物学
·
微生物学
✓ 已验证
DOI
高影响因子
CHEMICAL PAPERS
·
2014
·Vol. 68
·期 8
·1132-1136
·
IF 1.193
Tao Hong-Wen,Wang Xia,Yi Ping-Gui,Deng Zhi-Hong,Yu Xian-Yong,Li Xiao-Fang
A class of stereo-isomerically-pure alkanediol monoglycosides, 2-hydroxyethyl per- O -acetyl pyranosides ( IIIa-IIIf ), was conveniently prepared by a one-pot reaction of per- O -acetylated pyranoses ( Ia-If ) and 2-( tert -butyldimethylsilyloxy)ethanol ( II ) with catalysis by BF 3 ·OEt 2 . The α -( IIIa ) or β -linked glycosides ( IIIb-IIIf ) with 1,2- trans -configuration were obtained from glycosyl donors with participation of the neighbouring 2- O -acetyl group. BF 3 ·OEt 2 , along with hydrogen fluoride released from BF 3 ·OEt 2 under the experimental conditions used, facilitates the subsequent de-protection of siloxane to successfully afford 2-hydroxyethyl per- O -acetyl-pyranosides.
研究领域:
有机化学
·
糖化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2022
·
IF 4.198
Jiawen Wu,Cunbo Wei,Fen Zhao,Wenqian Du,Zhishuai Geng,Zhonghua Xia
A convenient and mild protocol for the gold-catalyzed intermolecular coupling of o-alkynylphenols with haloalkynes to give vinyl benzofurans is reported. In this work, the gold catalyst SIPrAuCl and the co-catalyst NaBARF would corporately promote the intramolecular cyclization of the o-alkynylphenol to benzofuran, and then a selective hydroarylation of benzofuran to haloalkyne was catalyzed by the same catalysts. Computational studies suggest that the hydroarylation process takes place via a concerted nucleophilic attack pathway of the benzofuran to the C2 carbon of the activated haloalkyne, and reveal the original driving force of this hydroarylation process.
研究领域:
有机化学
·
催化
·
合成化学
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Xiao-Hong Cao,Hao-Yan Zhang,Ru-Chao Ma,Qian Yang,Zhi-Bin Zhang,Yun-Hai Liu
A simple and selective colorimetric sensor based on o-phosphorylethanolamine-functionalized gold nanoparticles (OPA–Au NPs) as an optical probe has been developed for the detection of UO 2 2+ . OPA–Au NPs rapidly aggregate in the presence of UO 2 2+ , thereby causing a visual color change from red to blue, which is easily detectable by eye. The proposed sensing system possesses a selective response for UO 2 2+ over other heavy metal ions. The current method shows application potential for UO 2 2+ detection in real water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
SYNTHETIC METALS
·
2020
·
IF 3.286
Ke Qu,Yuqi Bai,Xiyan Gao,Miao Deng
Graphite and multiwall carbon nanotube (MWCNT) served as dual dopants to prepare the composite with poly (aniline- co - o -methoxyaniline) copolymer electrochemically. The aniline to o -methoxyaniline monomer feed ratio was screened, with 4 to 1 monomer ratio being optimal. The supercapacitive properties of the prepared dual dopant-doped composite as electrode materials have been investigated and yielded a large specific capacitance of 535.0 F/g under 1.0 A/g current density and showed excellent rate performance, even with large current densities applied (up to 50.0 A/g). The composite remained to give a relatively stable specific capacitance of more than 200.0 F/g after 500 galvanostatic charge-discharge cycles, which afforded better and/or comparable performance compared with other polyaniline-based composite. The composite’s morphological features were characterized with scanning electron microscopy. The results from this study will be significant for the development of conducting polymer-based energy storage materials.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
DOI
高影响因子
Reaction Chemistry & Engineering
·
2021
·Vol. 7
·期 1
·111-122
·
IF 4.239
Jing Song,Yongjin Cui,Guangsheng Luo,Jian Deng,Yujun Wang
o-Nitrotoluene nitration can produce 2,4-dinitrotoluene and 2,6-dinitrotoluene simultaneously, which is also the common side-reaction of toluene mononitration. Kinetic study is helpful to deepen the understanding of nitration and control the reaction better. A homogeneously continuous microflow system was constructed to determine the kinetic parameters of 2-MNT nitration. A complete kinetic model was established and all kinetic parameters were obtained. In general, the observed reaction rate will increase with increasing H2SO4 mass fraction. However, when the H2SO4 mass fraction increases to a certain value, the observed reaction rate decreases. This is the first time to report the maximum observed reaction rate constant corresponding to the H2SO4 mass fraction at different temperatures in this work. Compared to previous reports on this reaction, the system provides more accurate kinetic parameters and can be developed into a reliable platform for the kinetic study of similar reactions.
研究领域:
化学工程
·
反应动力学
✓ 已验证
DOI
高影响因子
Science Advances
·
2026
·Vol. 12
·期 27
·
IF 13.9
Huijing Li,Mengyu Liu,Yumeng Chen,Gaochen Jin,Lanlan Wang,Shuting Liu,Lianguang Shang,Jonathan Gershenzon,Ian T. Baldwin,Ran Li
Plants emit volatile compounds that orchestrate complex ecological interactions, with methylated catabolites of interaction-induced phytohormones being common examples. Salicylic acid (SA) mediates plant antipathogen responses, while its methylated derivative, MeSA, broadly mediates plant-insect interactions without specificity. Here, we identified dimethyl salicylate (DMSA), an unappreciated dimethylated SA catabolite, emitted by rice when attacked by the major destructive pest, the brown planthopper. DMSA biosynthesis requires an O -methyltransferase cascade, BSMT1 (benzoic acid/salicylic acid carboxyl methyltransferase 1)–MSOMT (methyl salicylate O -methyltransferase), which is directly activated by a jasmonate (JA)–responsive MYC2-JAMYB transcriptional cascade. Natural variation in the MSOMT promoter confers its herbivory-induced expression in indica but not japonica cultivars. Functionally, DMSA acts as a specific volatile signal attracting the egg-parasitoid wasps of brown planthoppers (BPHs) without mediating direct resistance, which demonstrably suppresses BPH populations in paddy fields. DMSA is an optimized advance in SA signaling derived plant “alarm calls” with great potential in sustainable rice pest management.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）