JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2016
·
IF 1.835
Dawei Li,Guangqian Li,Pingfeng Bian,Zhe Shen,Mengfan Fu,Wenjun Fang,Weidong Yan
Epigallocatechin gallate (EGCG) is the most abundant and active components in tea. In this text, the density and viscosity of ternary aqueous solution of EGCG containing LiCl/NaCl/KCl were determined at temperatures ranging from 288.15 to 308.15 K at atmospheric pressure. The density data was used to compute the apparent molar volumes (Vφ), limiting partial molar volumes (Vφ0), and transfer partial molar volumes (ΔtrsVφ0). The viscosity B-Coefficients were calculated from the measured viscosity data using the extended Jones–Dole equation. The values of density and viscosity increased continuously with the increasing of molality of EGCG and decreased with the temperature increasing. The positive values including (Vφ, Vφ0, ΔtrsVφ0, viscosity B-Coefficients, the free energies of activation for solvent Δμ10≠, and for solute Δμ20≠) and Helper’s constant (∂2Vφ0/∂T2)p close to zero indicated the presence of strong solute–solvent interactions and the structure–making effect of EGCG in the investigated solutions. The apparent molar isobaric expansions (Eφ0) decreasing with temperature suggested that the solute–solvent interactions became weaker as temperature increased. These significant parameters could provide necessary data about molecular interactions occurring in simulated body fluids.
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Experimental and Therapeutic Medicine
·
2017
·Vol. 14
·期 6
·5345-5354
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IF 1.261
Yang Liu,Xiuheng Liu,Lei Wang,Yang Du,Zhiyuan Chen,Hui Chen,Jia Guo,Xiaodong Weng,Xiao Wang,Ming Wang,Zhishun Wang
The aim of the present study was to investigate the effect and possible mechanism of apigenin on renal ischemia-reperfusion (I/R) injury in rats, as well as in in vitro experiments. In total, 36 rats were subjected to 45 min of renal ischemia, with or without treatment prior to ischemia with different concentrations of apigenin (2, 10 and 50 mg/kg) administered intravenously. All rats were sacrificed at 24 h after I/R injury. The serum creatinine (Cr) and blood urea nitrogen (BUN) levels were analyzed, and histological examination was conducted. In addition, the expression levels of B‑cell lymphoma 2 (Bcl‑2) and Fas/Fas ligand (FasL) were detected by immunohistochemistry, reverse transcription‑quantitative polymerase chain reaction and western blot analysis. For in vitro experiments, the NRK‑52E cell line was employed. The viability, apoptosis and expression levels of Fas, FasL and Bcl‑2 were examined in the culture of NRK‑52E cells following the I/R. The results indicated that apigenin significantly decreased the levels of serum Cr and BUN induced by renal I/R, demonstrating an improvement in renal function. The histological evidence of renal damage associated with I/R was also mitigated by apigenin in vivo. Furthermore, apigenin increased the cell viability and decreased cell apoptosis in the culture of NRK52E after I/R in vitro. Compared with the I/R group, the expression of Bcl‑2 was upregulated and the expression levels of Fas and FasL were downregulated by apigenin at the mRNA and protein levels in vivo and in vitro. In conclusion, apigenin appeared to increase the expression of Bcl‑2 and reduce Fas/FasL expression in renal I/R injury, providing evident protection against renal I/R injury in rats.
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Small
·
2017
·Vol. 13
·期 32
·1700805
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IF 8.643
Wenbo Lu,Tingting Liu,Lisi Xie,Chun Tang,Danni Liu,Shuai Hao,Fengli Qu,Gu Du,Yongjun Ma,Abdullah M. Asiri,Xuping Sun
The development of efficient bifunctional catalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is of extreme importance for future renewable energy systems. This Communication reports the recent finding that room-temperature treatment of CoO nanowire array on Ti mesh by NaBH 4 in alkaline media leads to in situ development of Co B nanoparticles on nanowire surface. The resulting self-supported Co B@CoO nanoarray behaves as a 3D bifunctional electrocatalyst with high activity and durability for both HER (<17% current density degradation after 20 h electrolysis) and OER (<14% current density degradation after 20 h electrolysis) with the need of the overpotentials of 102 and 290 mV to drive 50 mA cm −2 in 1.0 m KOH, respectively. Moreover, its two-electrode alkaline water electrolyzer also shows remarkably high durability and only demands a cell voltage of 1.67 V to deliver 50 mA cm −2 water-splitting current with a current density retention of 81% after 20 h electrolysis. This work provides a promising methodology for the designing and fabricating of metal-boride based nanoarray as a high-active water-splitting catalyst electrode for applications.
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Polymer Chemistry
·
2016
·Vol. 8
·期 2
·472-484
·
IF 5.687
Zhao Wang,Ruilong Sheng,Ting Luo,Jingjing Sun,Amin Cao
A series of diblock amphiphilic glycopolypeptide analogues poly(6-O-methacryloyl-D-galactopyranose)-SS-poly(γ-benzyl-L-glutamate) (PMAgala-SS-PBLG) with well-defined and tunable structure, and redox-responsive disulfide linkage were prepared through a combination of modulated reactions including RAFT polymerization, ring-opening polymerization, “click” coupling reaction and following TFA-mediated deprotection, and a non-disulfide analogue PMAgala27-CC-PBLG30 was prepared as a control. Molecular structures of the above prepared PMAgala-b-PBLG glycopolypeptide analogues were further characterized and their self-assembly properties were examined. The glycopolypeptide analogues were able to form stabilized micelles (with α-helix PBLG cores) and the uniform-sized PMAgala-SS-PBLG micelles exhibited obvious redox-responsive features in the presence of glutathione (GSH), whereas the non-disulfide control did not show such change. For biological applications, the lectin recognition properties, doxorubicin (DOX) delivery manner and human hepatoma cell receptor targeting capabilities were further evaluated. The results illustrated that the PMAgala-b-PBLG glycopolypeptide analogues might serve as redox-responsive, highly biocompatible multifunctional biomaterial platforms for practical applications.
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FOOD CHEMISTRY
·
2016
·
IF 4.052
Haiyun Zhai,Lu Huang,Zuanguang Chen,Zihao Su,Kaisong Yuan,Guohuan Liang,Yufang Pan
A novel solid-phase extraction chip embedded with array columns of molecularly imprinted polymer-coated silanized graphene oxide (GO/SiO 2 -MISPE) was established to detect trace rhodamine B (RB) in chili powder. GO/SiO 2 -MISPE monolithic columns for RB detection were prepared by optimizing the supporting substrate, template, and polymerizing monomer under mild water bath conditions. Adsorption capacity and specificity, which are critical properties for the application of the GO/SiO 2 -MISPE monolithic column, were investigated. GO/SiO 2 -MIP was examined by scanning electron microscopy (SEM) and Fourier transform-infrared spectroscopy. The recovery and the intraday and interday relative standard deviations for RB ranged from 83.7% to 88.4% and 2.5% to 4.0% and the enrichment factors were higher than 110-fold. The chip-based array columns effectively eliminated impurities in chili powder, indicating that the chip-based GO/SiO 2 -MISPE method was reliable for RB detection in food samples using high-performance liquid chromatography. Accordingly, this method has direct applications for monitoring potentially harmful dyes in processed food.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Yan Xu
The pursuit of clean energy generation and environmental preservation is of utmost importance for societal progress. However, couple clean energy production and pollution control is still a difficulty. In this study, a novel electrospun composite mat, with nano zero valent iron (Fe 0 , nZVI) encapsulated into polyacrylonitrile (PAN) nanofibers was acted as a catalyst. The activation energy (E a ) for the hydrolysis of NaBH 4 to produce hydrogen is 22 kJ·mol −1 , hydrogen atom utilization efficiency (HGE) of NaBH 4 is 60.80%. Three kinds of organic dyes 4-nitrophenol (4-NP), methylene blue (MB), and Rhodamine B (RhB) were served as the model pollutant, to construct NaBH 4 -organic system for energy production and pollution reduction. The NaBH 4 -organic system demonstrates a collaborative capability to simultaneously remove organic pollutants and generate hydrogen, with a coupling equilibrium point between the two processes. The hydrogen generation rate (HGR) and HGE increased with the concentration of pollutants increased. The degradation of 4-NP, MB, and RhB followed pseudo-first-order kinetics, with RhB degrading dosage 20 and 44 times higher than 4-NP and MB, respectively. H 2 and H· contributed to the organic degradation. nZVI directly participated in the formation H 2 and H·. PAN@Fe 0 possessed good recyclability and moderate cost. The degradation process adhered to the classical surface reaction controlled Langmuir-Hinshelwood (L-H) model. The integration of synergistic production capacity and pollutant degradation aligns well with the principles of green chemistry and sustainable development. This study demonstrates a novel approach to no precursor loss catalysts preparation, efficient production clean H 2 , advanced treatment of dye-containing wastewater, carbon neutral operation of sewage treatment plant.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 5
·1-13
·
IF 5.3
Hu Anqi,Chen Guoqing,Li Lei,Ma Chaoqun,Yang Taiqun,Gao Hui,Gu Jiao,Zhu Chun,Wu Yamin
Nitrogen, boron co-doped carbon quantum dots (gCQDs), and a coloration probe (PPD-NPs) with response to cobalt ions (Co 2+ ) were prepared by using 4-hydroxyphenylboric acid as the common precursor, with ethylenediamine and p-phenylenediamine (PPD) adopted as nitrogen-doped reagents, respectively. A noticeable brown-to-purple color change can be observed with the addition of Co 2+ , and a broad absorption band emerges at 535 nm. At the same time, gCQDs, which is introduced as the fluorescence signal source, will be significantly quenched due to the enhanced inner filtration effect, induced by the overlap between the emission spectrum of gCQDs and the emerging absorption band. Therefore, a colorimetric/fluorescent dual-mode sensing probe for Co 2+ is constructed by combining the recognition unit PPD-NPs and the fluorescent gCQDs into PPD-NP/gCQD. Under the optimized experimental conditions, the calculated limits of detection are 1.51 × 10 −7 M and 3.75 × 10 −7 M for the colorimetric mode and the fluorescence mode, respectively, well qualified for the determination of Co 2+ maximum permitted level in drinking water. The feasibility of the proposed method has been verified in tap water, lake water, and black tea samples. Graphical Abstract
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 27
·16592-16604
·
IF 10.7
Yajuan Zhang,Hui Xu,Xingwei Shi,Yuanhai Bao,Yong Chen
Designing non-precious-metal catalysts with performance matching that of precious-metal catalysts is crucial to the development of clean hydrogen energy. Herein, construction heterostructures and heteroatom doping strategies have been employed to construct an amorphous CoPB deposited on a crystalline Cu2S/Ni3S2 nanosheet (CoPB@Cu2S/Ni3S2) non-precious-metal electrocatalyst for water electrolysis. The introduction of Cu2+ successfully gave rise to an Ni3S2/Cu2S crystal–crystal heterostructure, on which the coating of the amorphous CoPB layer finally achieves a triple heterostructure by an electroless plating technique. The optimized electronic structure and geometry allow the CoPB@Cu2S/Ni3S2 catalyst to show a competitive catalytic performance, which requires just 25 mV of overpotential for the HER and 247 mV for the OER to achieve a current density of 10 mA cm−2. When loaded into an AEM water electrolyzer, the CoPB@Cu2S/Ni3S2‖CoPB@Cu2S/Ni3S2 cell just requires 1.84 V cell voltage to offer a large current density of 2000 mA cm−2, running for more than 1000 h without significant degradation in performance. This work demonstrates the benefit of the integration of the heterostructures and heteroatom doping strategies to prepare catalysts and provides a scientific basis for the development of high-performance non-precious-metal water electrolysis catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jin Liu,Yu Ding,Feng Wang,Jiabing Ran,Haining Zhang,Haijiao Xie,Yuqiang Pi,Liya Ma
Regarding carbon-based electrodes, simultaneously establishing a well-defined meso -porous architecture, introducing abundant hetero-atoms and improving the graphitization degree can effectively enhance their capacitive performance. However, it remains a significant challenge to achieve a good balance between defects and graphitization degree. In this study, the porous structure and composition of carbon materials are co-optimised through a ‘dual-function’ strategy. Briefly, K 3 Fe(C 2 O 4 ) 3 and H 3 BO 3 were hybridised with a gelatin aqueous solution to form a homogeneous composite hydrogel, followed by lyophilisation and carbonisation. Owing to the dual functionality of raw materials, the graphitization, activation and hetero-atom doping processes can occur simultaneously during a one-step high-temperature treatment. The resultant carbon material exhibits a high graphitization degree (I D /I G = 0.9 ± 0.1), high hetero-atom content (N: 9.0 ± 0.3 at.%, B: 6.9 ± 0.5 at.%) and a large specific area (1754 ± 58 m 2 /g). The as-prepared electrode demonstrates a superior capacitance of 383 ± 1F g −1 at 1 A/g. Interestingly, the cyclic voltammetry (CV) curves exhibit a distinctive pair of broad redox peaks, which is uncommon in KOH electrolyte. Experiment data and density functional theory (DFT) simulation verify that N-5, B co-doping enhances the activity of the faradic reaction of carbon electrodes in KOH electrolyte. Furthermore, the fabricated Zn-ion hybrid supercapacitor (ZHSC) based on this carbon electrode delivers a high-energy density of 140.7 W h kg −1 at a power density of 840 W kg −1 .
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Journal of Environmental Sciences
·
2024
·
IF 5.9
Yujiang Huang,Tong Hu,Sichen Li,Wenjun Zhou
Harnessing the redox potential of biochar to activate airborne O 2 for contaminant removal is challenging. In this study, ferrihydrite (Fh) modified the boron (B), nitrogen (N) co-doped biochars (BCs) composites (Fh/B(n)NC) were developed for enhancing the degradation of a model pollutant, tetracycline (TC), merely by airborne O 2 . Fh/B(3)NC showed excellent O 2 activation activity for efficient TC degradation with a apparent TC degradation rate of 5.54, 6.88, and 22.15 times that of B(3)NC, Fh, and raw BCs, respectively, where 1 O 2 and H 2 O 2 were identified as the dominant ROS for TC degradation. The B incorporation into the carbon lattice of Fh/B(3)NC promoted the generation of electron donors, sp 2 C and the reductive B species, hence boosting Fe(III) reduction and 1 O 2 generation. O 2 adsorption was enhanced due to the positively charged adsorption sites (C- B + and N C + ). And 1 O 2 was generated via Fe(II) catalyzed low-efficient successive one-electron transfer (O 2 → O 2 ·− → 1 O 2 , H 2 O 2 ), as well as biochar catalyzed high-efficient two-electron transfer (O 2 → H 2 O 2 → 1 O 2 ) that does not involve . O 2 − as the intermediate. Moreover, Fh/B, N co-doped biochar showed a wide pH range, remarkable anti-interference capabilities, and effective detoxification. These findings shed new light on the development of environmentally benign BCs materials capable of degradading organic pollutants.
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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2024
·
IF 3.1
Jingru Song,Yanping Huang,Lu Liu,Dengcheng Hui,Zheng Wang,Dong Xie,Yulang Jiang,Hongyan Cao,Yancheng Dai,Guan Ye,Shibing Su,Mingmei Zhou,Qin Zhang,Mingyu Sun
Yinchenhao decoction (YCHD) is widely used in the treatment of damp-heat syndrome of chronic hepatitis B (CHB), but it remains unclear about the active compounds in YCHD and its potential mechanism for treating CHB. The purpose of this work is to evaluate the clinical efficacy of YCHD combined with nucleoside analogues (NAs) for the treatment of CHB. Besides, based on the exact clinical efficacy, we combined serum metabolomics and network pharmacology to screen differential metabolites and related pathways regulated by YCHD to investigate the possible mechanism for treating CHB. It revealed that NAs plus YCHD could significantly improve alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels, increase HBV-DNA negative rate ( P <0.05), reduce the levels of inflammatory factors and LSM (both P <0.05), regulate lipids ( P <0.05), and improve the symptoms of traditional Chinese medicine (TCM) ( P <0.05) in CHB patients. YCHD was relatively safe. It showed 30 active compounds including chlorogenic acid, geniposide, emodin, quercetin, kaempferol, β-sitosterol and aloe emodin, and 115 key targets which were related to the regulation of lipids and reduction of oxidative stress related to the effect of YCHD in CHB in the network pharmacology analysis. We found 9 core targets and 4 key metabolites according to metabolomics, which were partly consistent with the network pharmacology findings. It proved that network pharmacology combined with metabolomics can well explain the “multi-component-multi-target” mechanism of complex TCM.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Chengyi Sun,Kai Du,Zhaoxian He,Zhijie Zhu,Yuqing Hu,Caihong Wang,Liping Mei,Qingling Xie,Yajie Chen,Yanyan Liu,Guangli Luo,Saddam Mustafa,Xu Chen,Xianfeng Du
This study investigated the effect of liquid nitrogen ball-milled mechanochemical treatment on multiscale structure and physicochemical properties of starches with typically selected A (rice starch, ReS), B (potato starch, PtS) and C (pea starch, PeS) crystal types. The morphology of starch samples changed from integral granules to irregular fragments, and the interaction between the exposure O H bonds led to a serious agglomeration. As the treatment times extended, the crystalline structure of starch samples was gradually destroyed, and the excessive treatment approached amorphization. Moreover, the thermal stability of starch samples showed the downward tendency; and with amorphization increased, the swelling power (SP), solubility (S), water absorption capacity (WAC), oil absorption capacity (OAC) and hydrolysis rate of starch samples gradually increased. The obtained results provided a theoretical foundation for broadening the application range of ball-milled starches with different crystal types.
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危险品化学品经营许可证（带存储）