International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jiayun Fu,Qianqian Zhang,Zhaoqiang Shi,Yemin Guo,Falan Li,Yanyan Zhang,Xia Sun
A novel electrochemical acetylcholinesterase (AChE) biosensor modified with cerium oxide-chitosan (CeO 2 -CS) and ordered mesoporous carbon-chitosan (OMC-CS) using a screen-printed carbon electrode (SPCE) was fabricated to detect organophosphorus pesticides (OPs). Compared with a common electrode, SPCEs do not need to be polished, can be conveniently carried, and are suitable for on-site detection. CeO 2 has good redox properties and a larger electron transfer rate. In addition, OMC has good electrical conductivity and a larger specific surface area, and chitosan (CS) has a considerable number of hydroxyl and amine groups in polymer chains, which have strong complexation ability. Herein, CeO 2 -CS and OMC-CS were modified in the SPCE layer by layer to improve the electrochemical response and increase the fixed amount of AChE. The results obtained with this biosensor revealed that its sensitivity was significantly improved. Taking into account the possible interaction between the test conditions, the experimental parameters were optimized using a quadratic orthogonal rotation combination design to achieve a high electrochemical signal. The properties of AChE/OMC-CS/CeO 2 -CS/SPCE were characterized by differential pulse voltammetry and cyclic voltammetry techniques. Under optimum conditions, the fabricated acetylcholinesterase biosensor showed great reproducibility and high stability. In addition, the as-prepared AChE biosensor was successfully utilized for analysis of OPs in vegetables.
研究领域:
生物化学
·
分析化学
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产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2020
·
IF 7.635
Shi-Neng Li,Baoqiang Li,Zhi-Ran Yu,Yang Li,Kun-Yu Guo,Li-Xiu Gong,Yujie Feng,Dechang Jia,Yu Zhou,Long-Cheng Tang
Hydrogels with exceptional mechanical properties at high water content are crucial need for practical applications in various fields. However, achieving a hydrogel possessed splendid mechanical performance with well trade-off between tensile strength and toughness is highly demanded due to the mechanical weakness of conventional hydrogel. Herein, we report a novel kind of nanocomposite hydrogel developed by integrating chitosan decorated halloysite nanotubes (CS-f-HNTs) into dual cross-linked structure composed of chemical and Fe 3+ induced ionically cross-linked network. Combining the nanoparticle reinforcement with physical interactions including hydrogen bonds among polymer chains and ionic coordination interaction between Fe 3+ ions and functional groups on chitosan chains and the copolymer chains, the hydrogel exhibits extraordinary and balanced mechanical performance, including high strength (3.06 MPa), outstanding stretchability (>2000%) and superior toughness (47.6 MJ m −3 ) in which water content remains ~80 wt%. Based on microstructure observation and dynamic mechanical behavior analysis, we demonstrated that the addition of CS-f-HNTs effectively bridged polymer chains via physical interactions and strengthened dual cross-linked network, leading to significant improved mechanical properties. Moreover, the hydrogels also possessed remarkable self-recoverability (97.9% for small strain (200%) and 91.5% for large strain (1000%)) at room temperature and the related mechanism was discussed. The strategy developed herein may provide a newfound avenue in the design and development of strong and tough hydrogel for promising applications in loading-bearing structural materials.
研究领域:
材料科学
·
生物医学工程
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DOI
高影响因子
NORDIC PULP & PAPER RESEARCH JOURNAL
·
2022
·Vol. 37
·期 2
·290-299
·
IF 1.595
Xuemei Wang,Yingping Qi,Yongfeng Shen,Hua Li
A new chitosan derivative (CS-CHO) was successfully synthesized based on chitosan (CS) and cyclohexene oxide (CHO). It proved that CHO was successfully grafted onto the amino group of CS by N-alkylation reaction through the characterization of FTIR, XRD and DSC-TGA. The mechanical properties (tensile strength, folding endurance, tearing strength), optical properties (whiteness, glossiness) of the CS-CHO coated paper sample were tested. The results showed that the mechanical properties of the paper treated with 10 % CS-CHO increased significantly without changing the appearance of the paper. The paper permanence (tensile strength, folding endurance, tearing strength and pH) of the treated paper samples tested by dry-heat aging test. The results showed that the permanence of the treated paper samples was significantly improved compared with the blank aged paper samples, which indicated that CS-CHO had the function of deacidification while reinforcing the paper samples, providing the possibility for deacidification and reinforcement in one-step method and playing a positive role in the paper preservation.
研究领域:
材料科学
·
化学
·
纸张保护
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DOI
高影响因子
CARBOHYDRATE RESEARCH
·
2025
·
IF 2.5
Peixuan Wu,Hao Zhuang,Yang Zhou,Gaobo Yu,Zhendong Zhao,Tawfik Khattab,Xianghui Wang,Yuanyuan Liu
Chitosan (CS) exhibits pH- and concentration-dependent antimicrobial activity, underscoring the need to develop CS-based materials with more stable and robust antibacterial performance. In this work, dimethyloctadecyl-(3-trimethoxysilylpropyl) ammonium (TSA) was chemically grafted onto the hydroxyl and amino groups of CS to synthesize TSA-CS derivatives. Two forms of microspheres—designated as GA-TSA-CS-12 and STPP-TSA-CS-12—were subsequently fabricated via emulsion cross-linking and ionic cross-linking methods, respectively. The resulting TSA-CS materials were thoroughly characterized by FT-IR, TGA, GPC, SEM, and XPS, confirming successful grafting, modified thermal properties, and altered molecular weight. Antibacterial evaluation revealed that TSA-CS-12 achieved high inhibition rates of 97.7% against E. coli and 98.7% against S. aureus , while the corresponding microsphere formulations maintained up to 93% antibacterial activity. These findings demonstrate that TSA-functionalized chitosan materials exhibit enhanced and more stable antibacterial performance, showing promising potential for biomedical applications.
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产品关联
DOI
PubMed
高影响因子
POLYMER
·
2020
·
IF 4.231
Shuang Sun,Yunming Wang,Longhui Li,Zhigao Huang,Huamin Zhou
Traditional fabrication methods for chitosan products limited in melt forming temperature higher than degradation temperature are hard to be directly applied to the manufacture of green transparent electronic substrates. Here, we proposed an innovative principle of all-green manufacture that surface molecular chains of chitosan nanospheres were melted at 120 °C and entangled under 8 MPa according to high molecules activity of Nano-effect on chitosan nanospheres surface, result in applicable mechanical performances (Hardness, 0.27 GPa; Modulus, 3.83 GPa). The optimum optical performance of chitosan substrate was 58% at visible light (400 nm ~ 800 nm). Additionally, chitosan nanospheres had been successfully fabricated as substrates of interdigital electrode sensors. Therefore, our innovative strategy provides a new processing concept of fundamental scientific principle, and directly promote the industrialization of chitosan in biosensors, thin film transistors , and all solid state supercapacitors , etc.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
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DOI
高影响因子
CELLULOSE
·
2021
·Vol. 29
·期 1
·233-243
·
IF 5.044
He Meng,Lu Tong,Jia Zhengtao,Tian Huafeng,Feng Mengna,Zhang Xinjiang,Zhang Meng,Wang Chengshuang,Zhao Yanteng,Qiu Jun
The development of novel biodegradable and ultraviolet (UV) shielding packaging materials has become a research hotspot, which could avoid “white pollution”. Chitosan is an ideal raw material for food packaging but lacks sufficient UV shielding property. In this work, we used an alkali/urea/zincate aqueous solvent to dissolve chitosan, and the resulting chitosan solution was heated with the existence of chemical crosslinker to convert Zn(OH) 4 2− into ZnO particles directly. Then, the chitosan/ZnO composite hydrogel sheets were obtained, which were converted to chitosan/ZnO composite bioplastic (CCZP) by a fixing and drying process. The structure and properties of CCZP were investigated with X-ray diffraction (XRD), scanning electron microscopy, XPS, water uptake and tensile testing etc. The results indicated that the in-situ synthesized ZnO particles had distributed evenly in the chitosan matrix. The optical transmittance of the obtained CCZP reached 0.01% at 300 nm and 51.6% at 800 nm, respectively, showing excellent UV shielding performance and relatively good visible light transmittance. Meanwhile, the mechanical properties of the chitosan bioplastic were improved by the incorporation of ZnO, and the tensile strength of CCZP reached up to 49.8 MPa, showing potential application as food packaging materials. Graphic abstract
研究领域:
材料科学
·
食品科学
·
高分子化学
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DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2016
·Vol. 25
·期 3
·277-284
·
IF 1.684
Li He-ping,Li Hui,Liu Yi
The development of new environment-friendly and efficient adsorbents has attracted a great interest in recent years. In this study, ethylene diamine-grafted chitosan copolymer (CS–MAA–EN) and triethylene tetramine-grafted chitosan copolymer (CS–MAA–TN) were synthesized to remove heavy metal ions from water. The influence of pH, adsorbents dosage and initial metal concentration were investigated to study the adsorbing effect of CS–MAA–EN and CS–MAA–TN for the removal of Cu 2+ from aqueous solutions. The equilibrium adsorption capacities of CS–MAA–EN and CS–MAA–TN were 85.91 and 102.67 mg/g, respectively. The adsorption process was fitted better by the Langmuir isotherm model ( R
2 = 0.9993, 0.9991) than the Freundlich isotherm model ( R
2 = 0.8781, 0.8775). The adsorption kinetics confirmed that the adsorption mechanism could be better described by the pseudo-second-order equation. Two adsorbents showed excellent desorption efficiency ( D
e ) and reuse ratio ( R
u ). D
e and R
u of CS–MAA–EN were evaluated as 95.2 and 89.35 %, respectively, and those values of CS–MAA–TN were 92.73 and 83.25 %. The competitive adsorption results of the two adsorbents indicated that the rate sequence was Fe 3+ > Cu 2+ > Cr 6+ > Ni 2+ > Zn 2+ .
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Qingqing Guo,Xin Wu,Yanhong Ji,Yufan Hao,Shuyu Liao,Zhenyu Cui,Jianxin Li,Mohammad Younas,Benqiao He
Nanofiltration (NF) membranes with adjustable permeability and selectivity are highly desired for the separation of small molecules. A novel pH-responsive NF membrane was synthesized via interfacial polymerization with a mixture of piperazine (PIP) and chitosan (CS) as the aqueous phase and trimesoyl chloride (TMC) in n-hexane as the organic phase. The effects of pH on the physicochemical structure and performance of the PIP-CS/TMC NF membrane obtained were studied in detail. The results showed that the surface physicochemical structure and performance of the membrane could be changed by adjusting the pH of feed solution. Specifically, the surface roughness, hydrophilicity and pore size of the NF membrane were increased at high pH values. The pure water flux through the NF membrane remained stable in the pH range 2–8 but increased exponentially from 248.2 to 643.8 L m −2 ·h −1 as the pH was increased from 8 to 12. Furthermore, the PIP-CS/TMC NF membrane demonstrated more than 99.0% rejection for Congo red, methyl blue, coomassie brilliant blue G250 in the pH range 2–12, while low rejection was observed for methyl orange and inorganic salts (Na 2 SO 4 , MgCl 2 ) at pH 12. The NF membrane exhibited excellent separation performance of the mixtures of anionic dye/salt or dye/dye with different molecular weights at pH 12. The reversibility of pH response with a high responsive coefficient of the NF membrane was also proved. This work provides a new route for NF membrane in the separation of some dye/salt and mixed dyes systems.
研究领域:
材料科学
·
环境工程
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DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Yan-Wei Liu,Ying Zhou,Guo-Qing Huang,Li-Ping Guo,Xiao-Dan Li,Jun-Xia Xiao
Coacervation of the lipase from Aspergillus oryzae (AOL) with chitosan was a feasible way to fabricate lipase-loaded particles and the optimum conditions were phase separation pH 5.5, chitosan to AOL mass ratio 1:5, and temperature 25 °C in the absence of NaCl, which conferred an AOL loading efficiency of up to 95.48% and activity recovery of 69.60%. The AOL-chitosan coacervates were highly porous and more susceptible to weight loss upon heating. Coacervation with chitosan increased the activity of AOL and shifted its optimum pH from 7.0 to 6.0, but exerted no effect on its optimum temperature (45 °C). Thermal deactivation kinetics analysis revealed that the coacervated AOL was more thermal stable, while the Michaelis-Menten kinetics analysis indicated that coacervation with chitosan increased the V max of AOL by 2.4 folds, but decreased its substrate affinity by 3.6 folds. Hence, the AOL-chitosan coacervates are potential in the construction of Pickering emulsion-based lipase catalysis systems.
研究领域:
生物化学
·
酶工程
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DOI
高影响因子
FOOD CHEMISTRY
·
2019
·
IF 5.399
Lin Yue,Dan Sun,Imran Mahmood Khan,Xiaoli Liu,Qixing Jiang,Wenshui Xia
The present study aims at synthesizing and in vitro antibacterial activity evaluation of chitosan oligosaccharide (COS) modified by Cinnamyl alcohol (Cin) onto the OH position of COS . Three different degrees of substitution (DS) COS-O-Cin1-3 were synthesized by changing different molar ratios of COS to Cin. UV–visible spectroscopy (UV–vis), Fourier transform infrared (FT-IR), 1 H nuclear magnetic resonance ( 1 H NMR), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and elemental analysis were conducted to characterize the successful synthesis of COS-O-Cin1-3. The results showed that they exhibited higher thermal stability, weaker crystallinity and better antibacterial properties than that of COS . These results aided in obtaining the important supports for exploring new functional antibacterial agents, which expand the scope of COS’s application in the food industry.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2026
·
IF 13.2
Xiaohan Zha,Zhuoying Meng,Chen Wang,Yiwen Ye,Hui Sun,Ying Liu,Ye Tian,Benzhi Ju
Developing adsorbents with efficient regeneration and long-term stability and reusability remains a critical challenge for sustainable heavy-metal removal. In this study, chitosan (CS) was molecularly engineered into a thermoresponsive hydrogel (TR-ICS g ) capable of integrating efficient Cu 2+ adsorption with rapid, low-consumption regeneration. Under thermal stimulation, enhanced interactions among hydrophobic alkyl groups promoted hydrogel dehydration, resulting in pronounced volume shrinkage. Further, during regeneration, this thermally induced shrinkage enabled efficient elution with only 200 mL·g −1 of 0.1 M HCl, reducing acid consumption by 67.2% compared to the swollen state. The shrunken TR-ICS g achieved a Cu 2+ desorption efficiency of 92.7% within 5 min, demonstrating rapid regeneration under low-eluent conditions. Under a standardized adsorption–desorption protocol (pH 6.0, 25 °C, initial Cu 2+ concentration of 200 mg·L −1 , 10 min), TR-ICS g sustained 20 consecutive cycles within 300 min, achieving a cumulative Cu 2+ uptake of 905 mg·g −1 , while the single-cycle uptake decreased only modestly from 52.4 to 38.2 mg·g −1 . This study provides a scalable, low-consumption regeneration strategy for sustainable and continuous heavy-metal wastewater treatment.
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DOI
高影响因子
Gels
·
2026
·Vol. 12
·期 9
·833
·
IF 6.4
Yufan Zhang,Jing Wang,Bo Liu,Xueqin Zhang,Yunxuan Weng
Photocrosslinked gelatin methacryloyl/methacrylated chitosan (GelMA/CSMA) hydrogels are attractive for biomedical applications but are limited by insufficient mechanical strength. Here, γ-methacryloxypropyltrimethoxysilane (MPTS) was prehydrolyzed and condensed to generate siloxane species retaining polymerizable methacrylate groups, which were subsequently incorporated into the GelMA/CSMA network as a reinforcing phase. The effects of MPTS precursor concentration (2–5%w/v) and prehydrolysis time (12–48 h) on the morphology, viscoelasticity, compressive behavior, cytocompatibility, and DLP printability of the resulting GCM hydrogels were systematically investigated. FTIR confirmed methoxy-group consumption while retaining C=C functionality. SEM showed that increasing MPTS precursor concentration increased the apparent abundance of granular features, whereas prolonged prehydrolysis produced larger structures. XRD indicated a predominantly amorphous MPTS-derived phase. GCM-48 h-5% achieved a storage modulus of 23.5 kPa, compressive modulus of 0.682 MPa, and maximum compressive stress of 1.081 MPa, corresponding to 7.4-, 16.9-, and 4.0-fold increases over the GelMA/CSMA control, respectively. The hydrogels exhibited favorable L929 cytocompatibility and retained DLP printability under 405 nm irradiation. These findings demonstrate that regulating MPTS precursor concentration and prehydrolysis time provides a simple route to mechanically reinforce DLP-printable GelMA/CSMA hydrogels without directly incorporating preformed silica particles.
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DOI
高影响因子
危险品化学品经营许可证（带存储）