FOOD CHEMISTRY
·
2015
·
IF 3.391
Kitty S.C. Tang,Izabela Konczak,Jian Zhao
Australian native mints have traditionally been used by the aboriginal people for natural remedies; however, their bioactive components have not been studied. Antioxidant capacity and composition of phenolic compounds of Mentha australis R. Br., Lamiaceae were investigated for the first time. Phenolic compounds were analyzed by HPLC photodiode array detector, liquid chromatography high resolution mass spectrometry, tandem mass spectrometry and nuclear magnetic resonance spectroscopy. Aqueous methanolic extract of the mint exhibited comparable antioxidant capacity to the common spearmint. Major compounds identified in the extract were rosmarinic acid (160.4 ± 0.85 μg mg −1 purified extract), neoponcirin (145.0 ± 0.42 μg gallic acid equivalent (GAE) mg −1 ), narirutin (30.3 ± 0.02 μg GAE mg −1 ), chlorogenic acid (15.4 ± 0.05 μg mg −1 ) and biochanin A (9.6 ± 0.06 μg GAE mg −1 ), while minor compounds were caffeic acid, apigenin, hesperetin and naringenin. Neoponcirin and biochanin A were identified for the first time in the Mentha genus.
研究领域:
植物化学
·
药用植物学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Shan Huang,Zhichun Si,Xuankun Li,Jinshuo Zou,Youwei Yao,Duan Weng
Au nanoparticles and reduced graphene oxide (r-GO) co-modified TiO 2 nanotube arrays (TNTs) were prepared by a facile and green strategy based on the electro-deposition technology for detecting H 2 O 2 , O 2 and nitrite. As-prepared Au/r-GO/TNTs electrode was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The results clearly demonstrate that the successful attachment of r-GO sheets and narrow-range distribution of Au nanoparticles on TNTs . The reduced grapheme oxide sheet can help to improve the electronic conductive performance of TNTs and prevent the agglomeration of Au nanoparticles. Electrochemical studies reveal that the Au/r-GO/TNTs electrode exhibit excellent electrocatalytic performance toward the reduction of H 2 O 2 . Under the optimal experimental condition, the sensor has a quick response to H 2 O 2 at −0.3 V with a high sensitivity (1011.35 mA M −1 cm −2 ), wide linear range (0.01–22.3 mM) and low detection limit (0.006 μM). In addition, the sensor also has good stability and excellent selectivity. Moreover, the established Au/r-GO/TNTs electrode also shows high sensitivities towards dissolved O 2 and nitrite ions, which has great potential for the development of electrochemical sensors, molecular bioelectronics devices and biosensors.
研究领域:
生物传感器
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电化学检测
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材料科学
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产品关联
DOI
高影响因子
OPTICS EXPRESS
·
2013
·Vol. 21
·期 13
·15728-15733
·
IF 3.546
Renping Cao,Fangteng Zhang,Chenxing Liao,Jianrong Qiu
RF2:Bi (R = Ca and Sr) phosphors were synthesized by solid state reaction method in air and their luminescence properties were investigated. Broad yellow-to-orange emissions peaking at ~550 nm (CaF2:Bi) and ~600 nm (SrF2:Bi) were observed under ~260 nm excitation. The emission centers inRF2:Bi (R = Ca and Sr) phosphors are Bi2+ ions, and the excitation and emission bands ofRF2:Bi (R = Ca and Sr) phosphors can be attributed to 2P1/2→2S1/2 and 2P3/2(1) →2P1/2 transitions of Bi2+ ions, respectively. The phosphors are promising for application in lighting due to broad yellow-to- orange emission.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Kaiting Chen,Xinyu Han,Qian Wang,Kaijie Liu,Xiangguang Yang,Yibo Zhang
The selective catalytic reduction of NO by CO (CO-SCR) presents an economical and promising approach to mitigate emissions of NO x and CO from motor vehicles. A bimetallic Rh-Mn supported catalyst Rh-Mn/CoAlO was synthesized through the reduction of citric acid and ethylene glycol, and subsequently employed in the CO-SCR reaction. Tests assessing its catalytic performance revealed that the Rh-Mn/CoAlO catalyst displayed superior CO-SCR activity, maintaining high efficiency (≥90 % at 230 °C) and stability while simultaneously reducing the usage of noble metals. Various characterization techniques, including H 2 -TPR, NO-TPD, CO-pulse, and XPS, indicated that the Rh-Mn/CoAlO catalyst possessed enhanced dispersion of noble metals. This increased dispersion ensured optimal contact between Rh and Mn, as well as the support, fostering a synergistic interaction that facilitated electron transfer. Consequently, the catalyst’s adsorption and activation capabilities for NO were significantly improved. In situ DRIFTs studies further elucidated that the catalyst primarily followed the E-R mechanism, wherein NO is adsorbed onto the catalyst surface, and subsequently, the N and O atoms generated from pyrolysis react with CO in the gas phase. The findings of this study are anticipated to offer an effective strategy for designing catalysts with exceptional low-temperature activity and high dispersibility for the reduction of NO using CO.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2016
·
IF 1.835
Jianfeng Hao,Wenge Yang,Hongjie Li,Shimin Fan,Wangdan Zhao,Yonghong Hu
We focus on the solubility of 4-methylsulfonylacetophenone. A gravimetric method was taken to measure the solubility of 4-methylsulfonylacetophenone in n-hexane, ethyl acetate, methanol, ethanol, n-propyl alcohol, n-butyl alcohol, ethylene glycol, cyclohexane, isobutyl alcohol, and (ethyl acetate + n-hexane) binary solvent mixtures from 278.15 K to 328.15 K under atmospheric pressure. Its corresponding (solid + liquid) equilibrium results will provide essential support for further theoretical studies. The solubility of 4-methylsulfonylacetophenone in nine pure solvents were correlated with λh and Apelblat models, while 4-methylsulfonylacetophenone in (ethyl acetate + n-hexane) binary solvent mixtures were correlated with the Apelblat and CNIBS/R–K models. The Apelblat model was proven to be the best-fit model for correlating the solubility of both pure solvents and binary solvents mixtures from the analysis of the STATISTIC.
研究领域:
化学
·
物理化学
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产品关联
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2019
·Vol. 42
·期 23
·3544-3552
·
IF 2.516
Xudong Xiao,Zhenqun Li,Ya Liu,Li Jia
An S-mandelic acid imprinted chitosan resin was synthesized by cross-linking chitosan with glutaraldehyde in 2% acetic acid solution. S-Mandelic acid imprinted chitosan resin was used to enantioselectively separate racemic mandelic acid in aqueous medium. When keeping the pH of sample solution (100 mM Tris-H 3 PO 4 ) at 3.5 and adsorption time at 40 min, the enantiomer excess of mandelic acid in supernatant was 78.8%. The adsorption capacities of S-mandelic acid imprinted chitosan resin for S- and R-mandelic acid were determined to be 29.5 and 2.03 mg/g, respectively. While the adsorption capacities of non-imprinted cross-linked chitosan for S- and R-mandelic acid were 2.10 and 2.08 mg/g, respectively. The result suggests that the imprinted caves in S-mandelic acid imprinted chitosan resin are highly matched with S-mandelic acid molecule in space structure and spatial arrangement of action sites. Interestingly, the enantiomer excess value of mandelic acid in supernatant after adsorption of racemic mandelic acid by R-mandelic acid imprinted cross-linked chitosan was 25.4%. The higher enantiomer excess value by S-mandelic acid imprinted chitosan resin suggests that the chiral carbons in chitosan and the imprinted caves in S-mandelic acid imprinted chitosan resin combine to play roles for the enantioselectivity of S-mandelic acid imprinted chitosan resin toward S-mandelic acid. Furthermore, the excellent enantioselectivity of S-mandelic acid imprinted chitosan resin toward S-mandelic acid demonstrates that using chiral chitosan as functional monomer to prepare molecularly imprinted polymers has great potential in enantioseparation of chiral pharmaceuticals.
研究领域:
分析化学
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生物材料学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2016
·
IF 4.917
Min-Hua Cui,Dan Cui,Lei Gao,Hao-Yi Cheng,Ai-Jie Wang
A continuous stirred tank reactor with built-in bioelectrochemical system (CSTR-BES) was developed for azo dye Alizarin Yellow R (AYR) containing wastewater treatment. The decolorization efficiency (DE) of the CSTR-BES was 97.04 ± 0.06% for 7 h with sludge concentration of 3000 mg/L and initial AYR concentration of 100 mg/L, which was superior to that of the sole CSTR mode (open circuit: 54.87 ± 4.34%) and the sole BES mode (without sludge addition: 91.37 ± 0.44%). The effects of sludge concentration and sodium acetate (NaAc) concentration on azo dye decolorization were investigated. The highest DE of CSTR-BES for 4 h was 87.66 ± 2.93% with sludge concentration of 12,000 mg/L, NaAc concentration of 2000 mg/L and initial AYR concentration of 100 mg/L. The results in this study indicated that CSTR-BES could be a practical strategy for upgrading conventional anaerobic facilities against refractory wastewater treatment.
研究领域:
环境工程
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生物技术
·
废水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2013
·
IF 2.297
Chaoyuan Wang,Yonghong Hu,Wenge Yang,Kai Wang,Yihua Li,Song Guo
The solubility of 2,3,4,5-tetrabromothiophene in (ethanol + tetrahydrofuran) binary solvent mixtures was measured within the temperature range from (278.15 to 322.15) K. The solubility increases with the rise of temperature, while it decreases with increasing ethanol content at constant temperature. The experimental data were fitted using the two variants of the combined nearly ideal binary solvent/Redlich–Kister (CNIBS/R–K) equation and the Jouyban–Acree equation, respectively. All the three equations were proven to give good representations of the experimental values. Computational results showed that the variant two of CNIBS/R–K equation was superior to the other two equations. The thermodynamic properties of the solution process, including the Gibbs free energy, enthalpy, and entropy, were calculated by the van’t Hoff analysis. The values of both the enthalpy change and the standard molar Gibbs free energy change of solution were positive, which indicated that the process was endothermic.
研究领域:
化学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH
·
2014
·
IF 0.968
Mei-Yun Zhou,Zhao-Jun Wu,Wen-Qing Li,Xing-Peng Hu,Rian Yan,Shi-Yi Ou,Hua Zhou
(R)-3-(allylthio)-2-((R)-3-(allylthio)-2-aminopropanamido)propanoic acid was isolated from the bulb of garlic, together with four known amino acids. Its structure was elucidated on the basis of 2D NMR and MS techniques. To the best of our knowledge, (R)-3-(allylthio)-2-((R)-3-(allylthio)-2-aminopropanamido)propanoic acid, which showed antibacterial activity against the Staphylococcus aureus antibiotic resistant strain, was the first example of dipeptide from garlic.
研究领域:
化学
·
药理学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
FLUID PHASE EQUILIBRIA
·
2013
·
IF 2.379
Yumei Kai,Yonghong Hu,Zheng Cao,Xiang Liu,Yan Liu,Wenge Yang
The solubilities of l -malic acid in pure and mixture organic solvents were measured from 278.15 to 323.15 K using the laser monitoring observation system. The modified Apelblat equation, the semi-empirical Buchowski–Ksiazczak λh equation and the Combined Nearly Ideal Binary Solvent/Redlich (CNIBS/R-K) equation were proposed to correlate the experimental data. In pure and mixed solvents, the 100RD (relative deviation) <3.61 and 7.58, respectively, the 10 4 RMSD (root-mean-square deviations) <3.07 and 2.28, respectively, so the equations selected in this work fit the data very well. Van’t Hoff equation was used to predict the dissolution enthalpy and entropy of l -malic acid in the corresponding solvents.
研究领域:
药物化学
·
物理化学
·
溶液热力学
·
药物结晶
·
分子药剂学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Chen Cai,Jiayin Chen,Wei Fu,Shuying Ning,Hao Zhou,Muhammad Kashif,Yaxin Su
The Ce-modified OMS-2 catalyst (Ce x -OMS-2) was synthesized by the hydrothermal synthesis method, after which its catalytic efficacy in the selective reduction of NO by CO was assessed. The experiments showed that Ce 0.08 -OMS-2 was capable of 100% NO conversion between 175 and 300 °C when 0.05%NO, 0.1%CO, 5%O 2 and N 2 were used as equilibrium gases, and the N 2 selectivity peaked at 93.2% at 175 °C. Additionally, Ce 0.08 -OMS-2 exhibits good sulfur resistance in the presence of 0.02% SO 2 and maintains more than 88% NO conversion at 175–275 °C. By using BET, XPS, H 2 -TPR, NH 3 -TPD, and In situ DRIFTS to characterize the catalysts, the effects of doping the active metal Ce on the physicochemical characteristics of OMS-2 catalysts were under investigation. In conclusion, the improvement of the low-temperature activity of the Ce x -OMS-2 catalyst is facilitated by lower agglomeration and crystallinity , larger specific surface area, smaller average pore size, enhanced surface oxygen vacancies, increased Mn 4+ concentration, and richer Brønsted acid. Reaction gas adsorbed species and intermediates on the catalyst surface were dynamically captured during In situ DRIFTS experiments. The CO-SCR reaction of the catalyst was found to follow the E-R mechanism below 200 ℃ and the L-H mechanism at 200–350 ℃.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jinzhi Cao,Yilin Zhao,Meihui Chen,Zhiyi Zhao,Yuhan Xiong,Dingding Tang,Yan Zhou,Xiong Qin,Nanqi Ren,Hui Wang,Jie Ding
Visible light-driven degradation of chlorophenols using metal-free photocatalysts has attracted significant attention. Two-dimensional covalent organic frameworks (2D COFs) exhibited high levels of visible-light activity. To address the challenges of insufficient redox capacity and recombination of photogenerated carriers of COFs, an S-scheme heterojunction is constructed from COFs with nitrogen vacancies modified graphitic carbon nitride (NVCN) to improve photocatalytic activity. Introducing electron donors (-OH and -C C) into COF could reduce the optical band gap and increase visible-light absorption. Meanwhile, they can form donor-acceptor (D-A) effects with nitrogen vacancies, thereby redistributing charge and enhancing the transfer rate of photogenerated electrons. Formation of S-scheme heterojunction effectively enhances the migration of photogenerated carriers and redox ability, the optimized heterojunction (COF-C C/NVCN) was able to degrade 98 % 4-chlorophenol within 90 min under visible light irradiation ( k = 0.044 min –1 ), which was 10–12 times higher than COF-H/NVCN or NVCN. This study provides the great potential of D-A COF/NVCN-based S-scheme heterojunctions for environmental remediation.
研究领域:
环境科学
·
材料化学
·
光催化
·
有机半导体
·
污染物降解
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）