COMPOSITES COMMUNICATIONS
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2023
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IF 8
Jiangjuan Yuan,Huan Kan,Han Wang,Ningli Wang,Yun Liu,Dong Pei,Qingli Qu
Enzymatic microreactors have gradually become a research hotspot as they can provide an ideal environment for the enzymatic reaction to ensure that the enzymatic reaction can be carried out in an organized manner. Here, inspired by the cellular structure of eukaryotic organisms, we developed Alginate@Chitosan (Alg@CS) microparticles for enzymatic reactions by oil-free gas-shearing method, allowing free access to substrate and product while shielding the enzyme from its surroundings. With the interpenetrating network crosslinked by Alg, CS and Ca 2+ as the substrate, XOD can be encapsulated in particles at the same time of crosslinking. The microreactors are more stable and could provide more active sites for XOD with the addition of CS. The microreactors show excellent recyclability and 4 °C storage stability. This work opens up an intriguing avenue for enzyme microreactor preparation, which is important for the construction of artificial biomimetic catalytic systems.
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CHEMOSPHERE
·
2023
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IF 8.8
Jiaqi Shen,Yuxin Gu,Yue Yang,Jiaojie He,Chuanliang Zhao,Yan Sun,Junfeng Li,Liwei Yang
The metal organic frameworks (MOFs) are considered as the effective adsorbents for phosphate removal , while their ultrafine powders limit their practical application. In this study, we fabricate two chitosan (CS) gel beads added with different cerium-based MOFs and coated with PDA for phosphate adsorption. The MOFs doped in beads are CM1 and CM2, in which the Ce(III)/Ce(IV) ratio is 0.36 and 1.46, indicating CM2 is Ce(III) dominated and more suitable for phosphate removal. However, during the process of preparing gel beads, the mixture of chitosan and CM1/CM2 are added drop-by-drop to NaOH solution, leading to the decrease of Ce(III) contents in both of the two beads on account of oxidization. On this basis, in order to improve the phosphate uptake performance and enhance the mechanical strength, polydopamine (PDA) is applied to be coated on the outside. The adsorption capacities of CS-CM1 and CS-CM2 are no more than 20 mg/g higher than that of pure CS, which is also quite equal with the phosphate uptake of CS@PDA (63 mg/g). Due to the reduction of PDA, the content of Ce(III) increasing evidently in the two adsorbents. The maximum phosphate adsorption capacities are 146.8 mg/g and 114.8 mg/g for CS-CM1@PDA and CS-CM2@PDA, respectively. CS-CM2@PDA exhibits the largest treatment volume of ∼1166 BV in the fix-bed column study, much higher than that of CS-CM1@PDA (976 BV). The main reason is that Ce(III) could form binding with phosphate through ligand exchange and precipitation. Those inner-sphere interactions are much stronger than the electrostatic attraction between Ce(IV) and phosphate. Thus, due to this strong affinity, CS-CM2@PDA possessing a higher content of Ce(III) can capture phosphate more easier at low concentration. In summary, owing to reduction of PDA, the Cerium-based MOFs are successfully introduced in CS to realize excellent phosphate removal and exhibit a great prospect in application.
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ACS Applied Nano Materials
·
2023
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IF 5.9
Ting-Ting Li,Kelei Zang,Xiaomeng Wang,Ching-Wen Lou,Jia-Horng Lin
In this paper, zinc borate nanoparticles were synthesized by in situ synthesis using zinc nitrate and sodium tetraborate as raw materials, and zinc borate nanoparticles were loaded onto carboxymethyl chitosan aerogel prepared by directional freezing in combination with a freeze-drying technique, and zinc borate (ZB)/carboxymethyl chitosan composite aerogels (ZBAs) with excellent multifunctionality have been successfully prepared. The thermal behavior of carboxymethyl chitosan aerogel (CCSA) and ZBAs was analyzed using TG and DTG, and the flame retardancy of the composite aerogel was explored by simple vertical combustion experiments, where the introduction of ZB significantly improved the flame retardancy of CCSA. Meanwhile, the presence of ZB did not affect the porous structure of the aerogels, and the average acoustic absorption coefficient of the ZBA was the lowest at 0.58, and the maximum value of the thermal conductivity was 0.069 W·m–1·k–1, which indicated that the aerogels were loaded with zinc borate nanoparticles for effective thermal insulation and acoustic absorption. Moreover, the composite aerogel maintained excellent antimicrobial properties after the addition of zinc borate nanoparticles. The results of this study provide ideas for the comprehensive application of carboxymethyl chitosan aerogels in different fields.
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ACS Applied Nano Materials
·
2023
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IF 5.9
Naijian Hu,Xiucai Wang,Jia Yang,Meng Liu,Jianwen Chen,Xinmei Yu,Wenbo Zhu,Minggao Zhang
Owing to their degradability, environmental friendliness, and low cost, natural polymers have been widely utilized in the fabrication of triboelectric nanogenerators (TENGs). Chitosan is a natural polymer containing long chains of n-acetylamino glucose. However, the low dielectric constant of pure chitosan films affects their electrical properties. Therefore, in this study, to improve their electrical output performance, the dielectric constant of the films was increased by the incorporation of conductive nanoparticles. Highly transparent Ag/Chitosan films were successfully constructed, and the output performance was improved by varying the concentration of Ag nanoparticles (100–200 nm). At a concentration of 6 wt %, the open-circuit voltage, short-circuit current, and transferred charge reached 74 V, 4.6 μA, and 23.8 nC, respectively, with a maximum output power of 83 μW. Besides, the fabricated friction-based nanogenerator (AC-TENG) lit 20 blue light-emitting diodes (LEDs) and successfully drove a commercial calculator, which verified its practical application potential. Finally, the AC-TENG was used to transmit Morse code, successfully sending the signals “HELP” and “SOS”, which might open opportunities in the field of communication application.
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JOURNAL OF FOOD SCIENCE
·
2023
·Vol. 88
·期 11
·4718-4730
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IF 3.9
Bin Wang,Yuke Zhao,Yufei Qu,Jingyu Lu,Hua Yan,Juan Gu,Qiqing Jiang,Yanshun Xu,Wenshui Xia
Alcoholism is a serious public health problem, and the abuse of drinking seriously damages the health of people. Chitosan oligosaccharides (COSs) are small-molecule oligosaccharides with amino groups that have many unique properties. The neuroprotective effect of COS on alcohol-induced hippocampal injury in Sprague–Dawley (SD) rats was investigated. The discrimination ratio of the COS group in the Y-maze experiment was 59.3% higher than that of the ETOH group. Meanwhile, the discrimination index was less than 0 in the ETOH group but greater than 0 in the COS group during the object recognition test. The cells in the COS group were more tightly arranged than those in the ETOH group. Proteomics was used to identify differentially expressed proteins in the hippocampus. There were 27 differentially expressed proteins in the COS and ETOH group for further bioinformatic analysis. There are three enriched pathway categories, namely, primary immunodeficiency, hedgehog signaling, and sulfur relay system. Next, sonic hedgehog signaling pathway-related proteins were verified through western blotting. The protein expression level of β-arrestin-2 in the COS group was 2.85 times higher than that in the ETOH group. This work may contribute to understanding the underlying mechanism of the neuroprotective effect of COS against alcohol-induced hippocampal injury in SD rats.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Xiuwu Liu,Chen Chen,Youhua Cao,Chengqiang Peng,Jing Fang,Haoyang Wang,Wei Wu,Gaojin Lyu,Hao Li
Chitosan is a desirable alternative for petroleum-derived packaging materials, but the unsatisfactory performance of most chitosan composites drastically impedes their practical application. In this work, a facile physical blending strategy was selected to prepare chitosan-based composite films with good properties utilizing sodium lignosulfonate as a reinforcing agent. The effects of sodium lignosulfonate addition on the barrier performance, antioxidant activity , UV-blocking, and mechanical properties of the composite films were evaluated. The enhancement mechanism of sodium lignosulfonate on the structural and functional properties of the membranes was also investigated. The results show that chitosan mixed with sodium lignosulfonate exhibited a higher tensile strength (∼75Mpa), improved barrier property (OTR and WVTR are 4.8 g·m −2 ·d −1 and 415 g·m −2 ·d −1 , respectively), increased free radical scavenging activity (29.9 %), and enhanced UV-blocking ability (95 %) compared to pure chitosan film. Strong electrostatic interaction and hydrogen bonding between monodispersed sodium lignosulfonate and chitosan have an essential effect on the performance of composite films. The application of sodium lignosulfonate as a reinforcing material is both environmentally friendly and economically viable, showing promising potential for use in food packaging applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Hehe Yang,Yao Liu,Fang Wen,Xu Yan,Yandong Zhang,Zhimei Zhong
The current study created three novel chitosan derivatives named BACS, PIBACS, and MHBACS by grafting benzoic acid (BA), p-isopropyl benzoic acid (PIBA), and m-hydroxybenzoic acid (MHBA) onto chitosan (CS). The structures of the derivatives were investigated using infrared spectroscopy (FT-IR) and nuclear magnetic resonance ( 13 C NMR). The derivatives were discovered to be 45.06 %–60.49 % substituted using elemental analysis (EA). Based on the findings of in vitro antioxidant experiments (hydroxyl radical scavenging activity, superoxide anion radical scavenging activity, and DPPH radical scavenging activity), all of the derivatives had a higher hydroxyl radical scavenging activity than the chitosan raw material. MHBACS scavenged (31.02 ± 0.90)% of hydroxyl radicals at 0.5 mg/mL, 28.69 % more than chitosan raw. The derivatives scavenged more superoxide anion radicals than the chitosan feedstock at a particular concentration. For instance, at a test dose of 0.2 mg/mL, the scavenging rate of MHBACS on superoxide anion radicals was 7.75 % greater than that of chitosan raw materials. DPPH radical scavenging activity, on the other hand, was not as competent as chitosan feedstock. The growth rate approach was used to assess the potential of the three derivatives to inhibit the development of four phytopathogenic fungi. Chitosan derivatives have better antifungal efficacy than chitosan raw materials. PIBACS, MHBACS, BACS, and Wuyiencin inhibited Phytophthora capsici by (98.03 ± 1.95)%, (81.73 ± 1.63)%, (66.38 ± 1.81)%, and (93.01 ± 2.69)%, respectively, at 1.0 mg/mL. PIBACS had a higher inhibitory impact on Phytophthora capsici than the positive control. Based on the evidence presented above, it is reasonable to conclude that the addition of benzoic acid molecules increased the antioxidant and antifungal capabilities of chitosan.
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MATERIALS LETTERS
·
2021
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IF 3.423
Siyin Qin,Huabing Li,Chengzhi Hu
Microencapsulated phase-change materials (MEPCMs) possess promising application in storing energy and protecting environment of biomaterials. However, the MEPCMs have the difficulty of low encapsulation efficiency and irregular shape. In this study, biodegradable chitosan/gelatin co-emulsifier as composite shell was used to encapsulate n -tetradecanol through oil-in-water-in-oil (O/W/O) method, and then crosslinked with glutaraldehyde (GTA). The results reveal that the latent heat and encapsulation efficiency of the microcapsules reach 146.88 J g −1 and 70.94%, respectively. Besides, the prepared microcapsules exhibit great thermal stability and thermal cycling reliability during the phase change process.
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Frontiers in Materials
·
2021
·
IF 3.515
Yu Ling,Dou Shubin,Ma Jinghan,Gong Qiang,Zhang Mogen,Zhang Xiquan,Li Min,Zhang Weifen
Antimicrobial peptides (AMPs) are a new class of promising antibacterial agents. We prepared electrospinning chitosan (CS)-polyethylene oxide (PEO) nanofiber membranes containing different concentrations of an antibacterial peptide NP10. The average diameter of nanofibers increased with the total concentration of NP10. The FTIR shows that all the peaks of CS-PEO nanofiber membranes with different concentrations of NP10 were almost the same as those of pure CS-PEO nanofiber membranes, and only the peak intensity changes. Adding NP10 can improve the thermal stability of CS-PEO nanofiber membranes. In the in vitro release experiment, NP10 was released from the CS-PEO-0.5%NP10 nanofiber membrane in a burst first and then slowly and continuously. Simultaneously, the CS-PEO-NP10 nanofiber membrane had good antibacterial activity against Escherichia coli and Staphylococcus aureus and good biocompatibility. In animal wound healing experiments, CS-PEO-0.5%NP10 nanofiber membrane had advantages over gauze and CS-PEO nanofiber membrane in wound healing. These properties may provide a choice for the clinical application of AMPs and treatment of wound infections.
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REACTIVE & FUNCTIONAL POLYMERS
·
2021
·
IF 3.975
Xianlin Xu,Jiajing Yu,Chang Liu,Guang Yang,Lei Shi,Xupin Zhuang
Biomass can adsorb dyes and then degrade. Although this material has remarkable prospects, its application is limited by its adsorption capacity and the simultaneous adsorption of cations/anions. Herein, a pore-forming agent in a solvent exchange phase transformation was used to fabricate chitosan xanthate and cellulose xanthate (xanthated chitosan/cellulose) sponges. Owing to the hierarchical pores and the presence of xanthic acid and amino groups, the sponges show efficient removal ability for anionic (congo red) and cationic (methylene blue) dyes. The adsorption mechanism, isotherm, kinetics, and thermodynamics were comprehensively studied. The xanthated chitosan/cellulose sponges exhibited the maximum adsorption capacities of 213.220 and 289.855 mg g −1 toward methylene blue and Congo red, respectively. The mechanism is a spontaneous physic-sorption process that fitted well with the pseudo-second-order and Langmuir isotherm models. These results revealed that xanthated chitosan/cellulose sponges are effective adsorbents for the removal of methylene blue and Congo red dyes and provide a new platform for dye decontamination .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Yuanhang Li,Zhiyuan Zhang,Zhengquan Fu,Di Wang,Chengyu Wang,Jian Li
Industrial waste acidic gases are huge hazards to the environment and human health, so a material that can detect and remove them is needed. In this paper, CM chitosan-Eu 3+ fluorescence aerogel was prepared via a green method by combining the carboxymethyl chitosan biomass polymer with Eu 3+ ions, the structure and properties of this aerogel were characterized by SEM, TG, and stress-strain curves. The coordination of Eu 3+ ions and carboxymethyl chitosan was analyzed with XPS and the difference in luminescence intensity of aerogel prepared at different pH values was analyzed. The monitoring of the aerogels revealed different responses to different acidic gases, and the fluorescence intensity of the aerogel showed a linear decrease with the adsorbed hydrogen chloride gas (HCl), while acetic acid gas (HAc) enhanced fluorescence. The adsorption system of the CM chitosan-Eu 3+ aerogel was simulated using pseudo-second-order kinetics, which showed that the maximum adsorption capacity of HCl is 9.16 mmol/g. The different response mechanisms of HCl and HAc gas were analyzed with FT-IR, fluorescence lifetime imaging and Judd-Ofelt theory. This fluorescence aerogel was found to have potential applications in ensuring industrial production safety.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Rining Jin,Jiajun Xu,Lijie Duan,Guanghui Gao
Recently, flexible and wearable sensors assembled from conductive hydrogels have attracted widespread attention. However, it is still a great challenge to make hydrogels with sufficient mechanical properties, self-adhesiveness and strain sensitivity. Here, a strong, tough, and self-adhesive hydrogel is successfully fabricated by a one-pot method, which introducing chitosan and 2-acrylamido-2-methylpropane sulfonic acid into the polyacrylamide network. The hydrogels exhibited adhesion (the peel strength reaches 798 N/m), mechanical property (The breaking strength and strain can reach 111 kPa and 2839%) and electrical conductivity (conductivity up to 0.0848 S/cm), which are suitable for wearable epidermal sensors. Besides, the hydrogels also possessed transparency. Therefore, this work would provide a novel insight on the fabrication of multi-functional self-adhesive hydrogel sensors.
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