International Journal of Electrochemical Science
·
2023
·
IF 1.5
Hui Yao,Wan-ting Zhang,Ting-yu Yan,Xiao-qin Li,Xiao-feng Wang
Metal-Organic Frameworks (MOFs) are promising materials in electrochemical sensor. Herein, Cu-doped zeolitic imidazolate framework (ZIF) was synthesized by hydrothermal method. The prepared composite was characterized by XRD, FTIR and SEM. Then the material was modified onto the surface of glass carbon electrode (GCE) with chitosan(CHIT) and Cytochrome C (cyt c ). The modified electrode showed good electrochemical activity toward the reduction of hydrogen peroxide (H 2 O 2 ). Under optimized conditions, the linear response of the sensor to H 2 O 2 ranges from 10～5200 μM, with a detection limit of 3.7 μM (S/N=3). Finally, the sensor was successfully applied to determine H 2 O 2 in water samples. Thus, the Cu-doped ZIF material has great potential for applications in electrochemical sensors.
研究领域:
分析化学
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材料科学
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电化学
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环境科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yuling Zhang,Hongwei Ren,Baochai Li,Syarah Mat Udin,Hasmerya Maarof,Wen Zhou,Fengfei Cheng,Jiaoruo Yang,Yize Liu,Hajar Alias,Erhong Duan
Deep eutectic solvents (DESs) composed by amino acids (L-arginine, L-proline, L-alanine) as the hydrogen bond acceptors (HBAs) and carboxylic acids (formic acid, acetic acid, lactic acid, levulinic acid) as hydrogen bond donors (HBDs) were prepared and used for the dissolution of dealkaline lignin (DAL). The mechanism of lignin dissolution in DESs was explored at molecular level by combining the analysis of Kamlet-Taft (K-T) solvatochromic parameters, FTIR spectrum and density functional theory (DFT) calculations of DESs. Firstly, it was found that the formation of new hydrogen bonds between lignin and DESs mainly drove the dissolution of lignin, which were accompanied by the erosion of hydrogen bond networks in both lignin and DESs. The nature of hydrogen bond network within DESs was fundamentally determined by the type and number of functional groups in both HBA and HBD, which affected its ability to form hydrogen bond with lignin. One hydroxyl group and carboxyl group in HBDs provided active protons, which facilitated proton-catalyzed cleavage of β-O-4, thus enhancing the dissolution of DESs. The superfluous functional group resulted in more extensive and stronger hydrogen bond network in the DESs, thus decreasing the lignin dissolving ability. Moreover, it was found that lignin solubility had a closed positive correlation with the subtraction value of α and β (net hydrogen donating ability) of DESs. Among all the investigated DESs, L-alanine/formic acid (1:3) with the strong hydrogen-bond donating ability (acidity), weak hydrogen-bond accepting ability (basicity) and small steric-hindrance effect showed the best lignin dissolving ability (23.99 wt%, 60 °C). On top of that, the value of α and β of L-proline/carboxylic acids DESs showed some positive correlation with the global electrostatic potential (ESP) maxima and minima of the corresponding DESs respectively, indicating the analysis of ESP quantitative distributions of DESs could be an effective tool for DESs screening and design for lignin dissolution as well as other applications.
研究领域:
化学
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材料科学
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生物技术
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可持续化学
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产品关联
DOI
PubMed
高影响因子
Food Bioscience
·
2023
·
IF 5.2
Zixu Wang,Lujuan Xing,Jiaming Cai,Fidel Toldrá,Yuejing Hao,Wangang Zhang
Alcoholic liver disease (ALD) is a worldwide disease caused by excessive ethanol consumption. In current study, hepatoprotective peptides were isolated from the porcine liver while their activities and interactions with ethanol metabolizing enzymes (alcohol dehydrogenase: ADH/acetaldehyde dehydrogenase: ALDH) were analyzed. The alcalase digested porcine liver hydrolysate (PLH) was confirmed to possess ADH/ALDH activation ability in a dose-dependent manner. The peptide sequences of PLH were identified by mass spectrometry. Molecular docking and in silico analysis were federatively used for screening. NTLPHPTAP had the lowest binding energy with ADH (−0.88 kcal/mol) and low toxicity. Fluorescence quenching data showed a dynamic fluorescence quenching constant (Kq) for NTLPHPTAP interacting with ADH/ALDH (ADH: 1.57 × 10 −10 M −1 s −1 ; ALDH:1.961 × 10 −10 M −1 s −1 ). Circular dichroism (CD) spectra and infrared spectrometer (FTIR) revealed that the enzyme secondary structures became flexible and disordered after interaction with NTLPHPTAP. Meanwhile, the ADH/ALDH was speculated to bind NTLPHPTAP via amido and carbonyl groups, respectively. These results indicated that the formation of ADH/ALDH-NTLPHPTAP complexes expanded the overall structure of the original enzymes and further increased the possibility of enzyme-substrate binding. In conclusion, the study proposed a method for the extraction of porcine liver hepatoprotective peptides and suggested further explanation for the interaction between NTLPHPTAP and ADH/ALDH in vitro .
研究领域:
生物化学
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药理学
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分子生物学
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2025
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IF 4.6
Yanying Rao,Hong Li,Xiaoying Ding,Binggui Wang,Yuanli Liu,Xiaoxu Zhao
In this study, Surface-enhanced Raman Spectroscopy (SERS) and Fourier Transform Infrared Spectroscopy (FTIR) were employed to investigate the molecular changes in Escherichia coli ( E. coli ) induced by exposure to ampicillin (AMP), enrofloxacin (ENR), ciprofloxacin (CIP), and norfloxacin (NFX) over time. The optimal concentration of E. coli for SERS analysis was determined to be 50 μL of bacterial suspension, diluted six times to achieve an OD600 ≈ 0.1. The primary changes in the SERS spectra were observed at 1267 cm −1 , corresponding to the amide III band in proteins, while the FTIR spectra revealed significant changes in the 1200–900 cm −1 range, associated with carbohydrates, under AMP treatment. ENR, CIP, and NFX, which are quinolone antibiotics, act as inhibitors of DNA synthesis. The main changes in the SERS spectra for antibiotic-resistant E. coli were observed at 760 cm −1 (attributed to cytosine and uracil), 960 cm −1 (C N stretching and C C deformation), and 1140 cm −1 (C O C stretching and ring breathing). In the FTIR spectra, significant changes were detected at 1655 cm −1 , 1544 cm −1 , and 1239 cm −1 , corresponding to the amide I, amide II, and amide III bands, respectively. The combination of SERS and FTIR with principal component analysis (PCA) enabled the detection of molecular modifications in antibiotic-resistant E. coli exposed to different classes of antibiotics. These findings enhance our understanding of the mechanisms of action of antibiotics in bacteria.
研究领域:
分析化学
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微生物学
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光谱学
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药理学
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分子生物学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 12
·8204-8213
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IF 3.9
Fangli Li,Ziqin Huang,Changjiang Liu,Meini Yang,Jixiang Wu,Wenhui Rao,Chuanbai Yu
Currently, additively efficient flame retardants are being developed to enhance the smoke suppression, flame retardancy, and thermal properties of composite materials. To this end, the current study designed and prepared a novel P/N/Si/Zn-containing organic–inorganic hybrid denoted as APHZ. Its inorganic part was 2-methylimidazole zinc salt (ZIF-8), which improved its smoke suppression and catalytic carbonization. The organic part (P/N/Si-containing compound) promoted its flame retardancy and interfacial compatibility between APHZ and epoxy resin (EP). The test results revealed that EP/APHZ-3 composites achieved a V-0 rating and a notable LOI value of 30.7% when introducing 3 wt% APHZ into the EP matrix. Cone calorimetry tests (CCT) further demonstrated that the average heat release rate (av-HRR), total smoke production (TSP), and CO production (COP) of EP/APHZ-3 were reduced by 23.3%, 14.0%, and 21.1%, respectively. Meanwhile, the char residual was increased by 60.6%, as compared to pure EP. Furthermore, the flame-retardant mechanism of EP/APHZ composites was investigated by the XPS, TG-FTIR, and Raman spectroscopy techniques. The observed synergistic effect of the imidazole skeleton ZIF-8 and P/N/Si-containing compound in APHZ facilitated the generation of a dense multi-element char layer, with the condensed phase flame-retardant mechanism playing a dominant role. These findings contribute to developing and designing high-performance flame-retardant EP.
研究领域:
材料科学
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化学工程
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高分子科学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
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2024
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IF 4.4
Yunfei Liu,Yayu Feng,Yue Sun,Meijing Zhang,Pengfei Zhang,Ronghui Zhao,Kuilin Deng
In this investigation, a nonconjugated fluorescent polyamide with piperazine and valerolactam moieties (PAM–PV) has been synthesized by the modified Ugi polymerization using 1,4-bis(3-aminopropyl)piperazine, levulinic acid, and 1,4-bis(3-isocyanopropyl)piperazine as monomers. In the polymerization, the special construction of levulinic acid leads to the formation of valerolactam on PAM–PV chains via the Mumm rearrangement. PAM–PV shows a strong fluorescence emission at 428 nm due to the intramolecular aggregation of piperazine and valerolactam moieties along the backbone. Impressively, PAM–PV can specifically detect NO2– ions via static quenching with a linear range of 10–6–10–5 M and a detection limit of 0.6 μM (0.0276 mg/L), which was far less than the minimum allowable concentration of 3 mg/L for NO2– in drinking water specified by WHO. Furthermore, the several common anions and cations have no interference effects on the specific detection of PAM–PV to NO2– ions. The quenching mechanism of NO2– and PAM–PV by FTIR, UV, and 1H NMR measurements indicates that the strong electrostatic interaction between NO2– and PAM–PV makes the macromolecular chains more relaxed and outstretched, leading to a formation of a nonfluorescent complex. Moreover, the practical detection of NO2– in the three water bodies, sauerkraut, and ham sausage and the fabrication of a portable detecting paper to NO2– ions were conducted in this experiment.
研究领域:
聚合物化学
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分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2020
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IF 7.182
Pengfei Han,Zhiming Li,Xin Wei,Liwen Tang,Mengting Li,Zhenyi Liang,Xueqiong Yin,Suying Wei
Ion-imprinted thermosensitive chitosan derivative (ITC) was successfully synthesized through a novel gradient heating process towards applications in heavy metal remediation, using Cu 2+ template paired with N -isopropylacrylamide (NIPAM) monomer. SEM, DSC, FTIR and Raman spectroscopy were used to characterize the structure and properties of ITC. The phase change temperature (PCT) of ITC was 35.31 °C in the heating cycle, whereas in the cooling cycle the PCT for ITC was 26.27 °C. The adsorption capacity of ITC for Cu 2+ at 45 °C (> PCT) was 88.94 mg/g. Desorption rate of 98.90 % was achieved after washing with ultra-pure water at 20 °C (< PCT). An adsorption capacity of 85 mg/g and a desorption rate of 97 % sustained after five cycles reuse. The adsorption capacity for Cu 2+ was measured at 80.23 mg/g under other seven interfering metal ions. The adsorption kinetics and adsorption isotherm fitted pseudo-second-order and Langmuir equation, respectively.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2017
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IF 3.648
Ai-Rong Xu,Shuan Wen,Lin Chen
Novel cellulose solvents, MIM-[N 4444 ][CH 3 CH 2 COO], were developed by coupling N -methylimidazole (MIM) with tetrabutyl ammonium propionate ([N 4444 ][CH 3 CH 2 COO]). The solubilities of cellulose in MIM-[N 4444 ][CH 3 CH 2 COO] solvents were determined at 25 °C. The effect of MIM content on cellulose solubility and the possible dissolution mechanism of cellulose in MIM-[N 4444 ][CH 3 CH 2 COO] solvent have been investigated. It was found that [CH 3 CH 2 COO] − anion in MIM-[N 4444 ][CH 3 CH 2 COO] solvent is the main driving force of the cellulose dissolution by interacting with the hydroxyl hydrogen atom in cellulose, and the role of MIM is mainly to disassociate/dilute [N 4444 ][CH 3 CH 2 COO]. In addition, the morphology and structure of the regenerated cellulose materials from MIM-[N 4444 ][CH 3 CH 2 COO] solvent were characterized by scanning electron micrograph (SEM), Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray diffraction (XRD).
研究领域:
材料科学
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化学工程
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高分子科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2019
·Vol. 37
·期 9
·919-929
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IF 2.804
Yang Shi-Xuan,Fan Zi-Yu,Zhang Feng-Yu,Li Si-Hao,Wu Yi-Xian
The random copolymers of isobutylene (IB) with polar comonomers of 4-acetoxystyrene (ACS) or 4- tert -butoxystyrene (TBO), P(IB- co -ACS) and P(IB- co -TBO), could be successfully synthesized via cationic copolymerization with FeCl 3 -based initiating system. The kinetics of the cationic copolymerization process was in situ investigated by inserting a diamond probe into the reaction system by ATR-FTIR spectroscopy. The chemical structure and incorporation content of polar comonomers in the copolymers were characterized by GPC with RI/UV dual detectors and 1 H-NMR spectroscopy. The corresponding functionalized random copolymers of IB with vinyl phenol P(IB- co -POH) carrying phenolic hydroxyl side groups could be further prepared via the complete hydrolysis of acetoxyl side groups in P(IB- co -ACS) or tert -butoxyl side groups in P(IB- co -TBO) copolymers. The functionalized P(IB- co -POH) copolymers became hydrophilic with water contact angle (WCA) of ca . 80° for the self-assembly in hot water, compared to the hydrophobic polyisobutylene with WCA of ca . 110°. The functionalized P(IB- co -POH) copolymers also displayed an excellent self-healing property due to the interaction of intermolecular hydrogen bonding and formation of three dimentional supramolecular networks from phenolic hydroxyl side groups. Furthermore, P(IB- co -POH) copolymers also provided a good matrix for the homogeneous dispersion for silica nanoparticles due to the formation of hydrogen bonding between copolymer chains and silica nanoparticles.
研究领域:
高分子化学
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材料科学
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纳米技术
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
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IF 2.843
Wei Wang,Xin Wang,Ying Pan,Kim Meow Liew,Ola A. Mohamed,Lei Song,Yuan Hu
Phosphorylated graphene oxides (PGO) were synthesized by a one-pot method and fabricated on the surface of cotton fabrics for the improvement of fire safety. The chemical structure of PGO was characterized by FTIR and XPS. SEM images of the pure and coated cotton fabrics indicated that PGO had better compatibility with water than GO and was more beneficial for self-assembly fabrication than GO. Vertical flame test and cone calorimeter test revealed that flame retardancy of cotton fabrics was obviously improved by PGO based multilayer coating. The plausible flame retardancy mechanism was proposed: PGO with large layered structures could effectively insulate the permeation of oxygen and volatile flammable gases, thereby decreasing the heat release rate; on the other hand, the presence of phosphorus could play an important role in the catalytic charring effect during combustion, which significantly promoted the formation of char residue and then further prevented the permeation of oxygen and pyrolysis products.
研究领域:
材料科学
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化学
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纺织工程
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防火安全
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产品关联
DOI
高影响因子
Wood Material Science & Engineering
·
2023
·
IF 2.2
Zhiping Wang,Anmin Huang,Shifeng Zhang,Yingying Su,Yuejin Fu
Wood emits volatile organic compounds (VOCs) that can affect people’s health and air quality. Based on advanced oxidation processes (AOPs), sulfate radicals produced via thermally-activated persulfate (Na2S2O8, KHSO5) can minimize VOCs. This research aims to apply this technique to minimize the VOC content in Pinus radiata. The results showed that terpenes and alcohols were the main VOCs emitted from Pinus radiata, which were greatly minimized using four treatments; however, acetic acid and 3-furaldehyde emissions increased. Furthermore, the temperature and oxidizing agent contributed to VOC degradation. Characterization results, including FTIR, XRD, color tests, and compressive strength indicated that the AOP treatment caused only a slight decline in the wood properties, while effectively reducing VOC emissions by as much as 32.75–61.05%.
研究领域:
环境科学
·
材料科学
·
化学工程
·
林业
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Yan Huang,Yufeng Zhou,Zebin Yu,Shijie Li,Zuofang Yao,Yi Liu,Xinqiu Tan,Yikai Wang,Yanping Hou
To address the bottlenecks of sluggish carrie r separation and insufficient active sites in lead-free halide perovskite of Cs 3 Sb 2 Cl 9 , magnetic transition metal (Co) was introduced and regulated the Co/Sb bimetallic ratio via a facile co-precipitation method to develop the Cs 4 Co 1.2 Sb 1.8 Cl 12 for light-driven CO 2 conversion. Results of electron paramagnetic resonance (EPR), Kelvin probe force microscopy (KPFM) and theoretical calculations revealed that the introduction of Co 2 + could promote the formation of chlorine vacancies ( V Cl ) and enhance local spin polarization, thereby facilitating CO 2 adsorption and activation, as well as accelerating carriers separation. The average carriers lifetime of the Cs 4 Co 1.2 Sb 1.8 Cl 12 was 1.8 times that of pristine Cs 4 CoSb 2 Cl 12 , beneficial to charges participation in CO 2 reduction reaction. The CO yield from the Cs 4 Co 1.2 Sb 1.8 Cl 12 (130.23 μmol·g −1 ·h −1 ) was 1.33 times that of Cs 4 CoSb 2 Cl 12 and 278 times that of pur e Cs 3 Sb 2 Cl 9 . Notably, without sacrificial agent, an unprecedented CO yield of 66.22 μmol·g −1 ·h −1 was achieved in photocatalytic CO 2 reduction, representing the best performance among lead-free halide double perovskites reported to date. In-situ FTIR analysis demonstrated the carboxylate (COOH*) as the dominated intermediate during CO 2 reduction. This work provides a reference for designing efficient lead-free halide perovskite photocatalysts via enriching halide vacancies and strengthening spin polarization for CO 2 conversion.
研究领域:
材料科学
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光催化
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钙钛矿化学
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环境科学
·
能量转换
✓ 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）