RSC Advances
·
2015
·Vol. 6
·期 4
·2678-2686
·
IF 3.84
Chunzhen Fan,Kan Li,Yalin Wang,Xufang Qian,Jinping Jia
Magnetic chitosan beads (MCBs) synthesized through a common embedding method and crosslinked with glutaraldehyde were studied for the adsorption of Cu2+ in aqueous solution. MCBs were investigated by means of hysteresis curves, thermo-magnetization curves, TGA, FTIR and XRD. Kinetic, isothermal and thermodynamic studies were applied to investigate the adsorption of Cu2+ by the MCBs. The effects of the pH value and the coexisting ions on the adsorption of Cu2+ were explored. Subsequently, the stability of the MCBs including the adsorption capacity (Qe) and the saturated magnetization (Ms) stability was investigated under various conditions. Simultaneously, FTIR and XRD were utilized to further analyze the change in the MCBs in the stability studies. The results suggested that the MCBs showed good stability without a significant loss in Qe and Ms after regeneration from five sequential cycles. The MCBs presented excellent storage stability while stored in a drying vessel for ten months. For thermal stability, the Qe and Ms of the MCBs presented similar variations after being heated in the atmosphere and in a vacuum at different temperatures for 30 h. The Qe changed slightly after being heated at 50 and 100 °C, and decreased sharply at 150 and 200 °C. The magnetization was stable in the lower temperature range (50–150 °C) and increased slightly at 200 °C. Different magnetic fields had little effect on the stability of the MCBs.
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FIBERS AND POLYMERS
·
2017
·Vol. 18
·期 4
·706-712
·
IF 1.113
Meng Guihua,Peng Huili,Wu Jianning,Wang Yixi,Wang Hao,Liu Zhiyong,Guo Xuhong
Superhydrophobic cellulose and chitosan composite aerogel (SCECS) is fabricated through a novel and simple approach for the first time. During the preparation of cellulose and chitosan composite aerogel (CECS), chitosan is selfassemble into number micron-diameter particles on the surface of aerogel, which is similar to the micromorphology of a lotus leaf. Based on the rough surface, CECS is modified by sodium stearate through electrostatic interaction and ion exchange. Water contact angles of 156° are obtained for superhydrophobic aerogel. SCECS can remove various oils from water and with absorption capacities of 10 g/g for oil. Furthermore, the special structure of a non-porous of surface and porous layer of internal is benefit to separate surfactant-stabilized water-in-oil emulsions under gravity.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xinxin Wang,Ruixue Meng,Shiyong Zhao,Zhenyu Jing,Yonghui Jin,Jie Zhang,Xinxin Pi,Qiuju Du,Long Chen,Yanhui Li
Radioactive iodine is considered one of the most dangerous radioactive elements in nuclear waste. Therefore, effective capture of radioactive iodine is essential for developing and using nuclear energy to solve the energy crisis. Some materials that have been developed for removing radioactive iodine still suffer from complex synthesis, low removal capacity, and non-reusability. Herein, covalent organic framework (COF)/chitosan (CS) aerogels were prepared using vacuum freeze-drying, and the COF nanoparticles were tightly attached on the green biomass material CS networks. Due to the synergistic effect of both COF and CS, the composite aerogel shows a three-dimensional porous and stable structure in the recycle usage. The COF/CS aerogel exhibits excellent iodine adsorption capacity of 2211.58 mg g −1 and 5.62 g g −1 for static iodine solution and iodine vapor, respectively, better than some common adsorbents. Furthermore, COF/CS aerogel demonstrated good recyclability performance with 87 % of the initial adsorption capacity after 5 cycles. In addition, the interaction between iodine and imine groups, amino groups, and benzene rings of aerogel are the possible adsorption mechanisms. COF/CS aerogel has excellent adsorption properties, good chemical stability, and reusable performance, which is a potential and efficient adsorbent for industrial radioactive iodine adsorption from nuclear waste.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2024
·Vol. 25
·期 15
·8125
·
IF 4.9
Taoyang Cai,Shangjie Ge-Zhang,Chang Zhang,Pingxuan Mu,Jingang Cui
Transparent films with excellent antibacterial properties and strong mechanical properties are highly sought after in packaging applications. In this study, Ag/SiO2nanoparticles were introduced into a mixed solution of chitosan (CS) and polyvinyl alcohol (PVA) and a Ag/SiO2-CS-PVA transparent film was developed. The excellent properties of the film were confirmed by light transmittance, water contact angle tests and tensile tests. In addition, for the antibacterial test, the antibacterial properties of the sample against Gram-negative bacteria (Escherichia coli) and Gram-positive bacteria (Staphylococcus aureus) were explored, and the average size of the bacteriostatic circle was measured by the cross method. The final results show that Ag/SiO2-CS-PVA transparent film has the advantages of good antibacterial properties, high transparency and high mechanical strength.
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Nanoscale
·
2024
·
IF 5.8
Xiaodong Yu,Jihao Fan,Shengquan Zheng,Linlin Ma,Xiaojing Liu,Yue Wu,Chuangqi Zhao,Lei Jiang
High strength/toughness nanocomposites are increasingly in demand due to the development needs of high-end applications. However, the aggregation and random orientation of nanofillers and the weak crosslinking of the polymer matrix lead to the degradation of the mechanical properties of nanocomposites. Here, we present a strategy to prepare chitosan-based nanocomposites with aligned nanosheets via the in situ photo-crosslinking of modified chitosan. The well-dispersed and highly aligned nanosheets, as well as the dense covalently crosslinked network between the modified chitosan chains, effectively improve the mechanical properties of the prepared nanocomposites. For example, the chitosan-based nanocomposite films exhibit a tensile strength of up to 340.6 ± 13.4 MPa, a Young's modulus of 8.2 ± 0.2 GPa and a toughness of 22.0 ± 2.5 MJ m−3, which are 4.2, 4.8 and 1.8 times higher, respectively, than those of pure chitosan films. Moreover, the thermal decomposition temperature of the chitosan-based nanocomposite films reaches 286.8 °C, which is 48.5 °C higher than that of pure chitosan films. We consider that our strategy, which constructs a crosslinked chitosan structure with aligned nanofillers, could lead to the development and application of the bio-based composites with excellent mechanical properties.
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BIOMACROMOLECULES
·
2025
·
IF 5.4
Hongyan Wang,Lin Shi,Zhongxu Zhang,Long Chen,Xinli Xu,Weiwei Ding,Chuntao Chen,Dongping Sun
Managing uncontrolled and noncompressible bleeding presents a major challenge in emergency trauma care. Methods to halt bleeding quickly and efficiently, without applying direct pressure on the wound, have become a key focus of research. Herein, a novel fructose-modified chitosan/gelatin composite sponge has been developed, exhibiting high elasticity, low rebound pressure, and excellent cell compatibility. This material can rapidly return to its original form in around 1.5 s after being compressed by 80% upon contact with water. Additionally, experimental results from a rat liver wound model demonstrated that it exhibited a clear hemostatic effect. The hemostatic time was shortened from 204 ± 15.35 s to 53.3 ± 6.54 s, and the blood loss was reduced from 867 ± 153.15 mg to 187 ± 61.06 mg. Moreover, it can promote tissue healing by inhibiting the production of inflammatory factors including TNF-α, MCP-1, and IL-6. This material offers an effective solution for noncompressible tissue injuries.
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CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Fang Liu,Yinchun Liu,Youli Guo,Jianrui Liu,Jingwen Dong,Tengbin Wang,Di Hao,Yongqin Zhang
We developed and validated a novel Fourier transform infrared (FTIR) method to determine the degree of molar substitution (MS) for hydroxypropyl chitosan (HPCS) using nuclear magnetic resonance ( 1 H NMR) as a reference, and investigated the factors influencing the MS assay. Through extensive screening of integration methods for candidate bands in the FTIR spectrum of HPCS using 20 HPCS samples with degrees of acetylation (DA) ranging from 0.003 to 0.139, we found that when using band area at 2970 cm −1 as a probe integral, the MS values obtained via the 1 H NMR method exhibited linear correlations (R 2 > 0.98) with at least 16 integral ratios derived from their FTIR spectra. The optimal reference bands with high reliability are located at 3440 cm −1 and 1415 cm −1 , with R 2 exceeding 0.99 and a MS range of 0.17–1.92. The band at 2875 cm −1 is less affected by the trace moisture present in HPCS samples than the others. The results of the method validation demonstrated a mean recovery of 98.9 ± 2.8 % and an RSD below 10 %, suggesting a simple, robust, and highly accurate and precise method. This method could be extendable for the determination of the MS of insoluble HPCS derivatives and other hydroxypropylated polysaccharides .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Que Bai,Fangfang Hu,Siyuan Gou,Qian Gao,Shihao Wang,Wenhui Zhang,Yanni Zhang,Tingli Lu
The damaged skin for some reasons is vulnerable to invasion by bacteria and other harmful microorganisms, leading to delay of the wound healing. In order to promote the infected wound healing, curcumin was loaded with chitosan-based hydrogel was formed through phenylborate ester bonding and its properties and effects on the S. aureus -infected wound healing was tested. It was found the hydrogel showed good antioxidation on the intracellular reactive oxygen species, inhibition on the growth of S. aureus , and acceleration the infected skin healing. The ablity of hydrogel due to its regulating inflammation, promoting angiogenesis and collagen synthesis in the wound site. This research work suggested that the developed multifunctional hydrogel might be a beneficial treatment for the infected wound healing.
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Polymers
·
2025
·Vol. 17
·期 3
·387
·
IF 4.9
Rong Sun,Liangliang Li,Jiangjie Zhou,Yongfeng Zhang,Haiya Sun,Datong Zhang,Qi Wu
Zein exhibits excellent biodegradability, thermal stability, UV resistance, and water barrier properties, making it a promising candidate for food packaging applications. However, pure zein films suffer from brittleness and poor mechanical strength, which limit their practical use. In this study, a unique bilayer packaging film (ZP/P-C) was developed using a layer-by-layer solution casting technique, where hydrophobic zein was coated onto a polyvinyl alcohol and chitosan composite layer (P-C). Incorporating PEG400 into the zein layer improved the interfacial compatibility of the bilayer film, increasing its uniformity and toughness. The resulting bilayer films demonstrated enhanced mechanical properties, flexibility, and water vapor barrier performance. Specifically, the ZP7.5/P-C bilayer film showed an elongation at break of 68.74% and a modulus of elasticity of 187.19 MPa. It had a water vapor permeability of 6.60 × 10−11g·m·m−2·s−1·Pa−1and provided near-complete UV protection within the 200–350 nm range. Furthermore, an intelligent detection bilayer film was created by integrating anthocyanin extract into the zein layer. Adding anthocyanin improved the film’s antioxidant properties and allowed it to respond colorimetrically to total volatile basic nitrogen. The bilayer film ZPBA1.0/P-C displayed an excellent antioxidant activity (45.8%) and remarkable color change (ΔE = 20.2) in response to ammonia, effectively indicating shrimp spoilage in 48 h (ΔE > 10). This investigation spotlights the potential of zein-based bilayer films in active and intelligent food packaging, offering innovative strategies to improve food safety and extend the shelf life of perishable goods.
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CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Taishan Liu,Huan Lei,Linlin Qu,Chenhui Zhu,Xiaoxuan Ma,Daidi Fan
Chronic wounds caused by hyperglycaemia, hypoxia and bacterial infections are common complications in diabetic patients and chronic wound repair is extremely challenging in clinical practice. A series of hydrogels QPMP with good antioxidant and antimicrobial functions were prepared based on quaternized chitosan (QCS), oxidized pullulan polysaccharide (OP), dopamine-coated polypyrrole (PPY@PDA), and Chlorella vulgaris . The Schiff base cross-linking between the quaternized chitosan (QCS) and oxidized pullulan polysaccharide (OP) constitutes the basic skeleton of the hydrogel, and imparts a certain antimicrobial ability to the hydrogel. Chlorella vulgaris continuously produced oxygen under light conditions to relieve wound hypoxia and promote wound healing. The incorporation of PPY@PDA gave the hydrogel near-infrared (NIR) irradiation-assisted bactericidal activity and antioxidant activity, and as a conductive hydrogel, the hydrogel can be used to sense wound exudate and temperature changes, which can help to achieve the integration of diagnosis and treatment of wound healing. Most importantly, in a chronic wound model, the QPMP hydrogel was more effective in controlling the level of wound inflammation and promoting collagen deposition, angiogenesis, and early wound closure compared to the HeraDerm dressing. Therefore, this conductive oxygen-producing hydrogel is extremely beneficial for chronic wound healing in diabetes.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Xiaoyan Song,Siyuan Yu,Junxia Deng,Jia Liu,Jinfeng Xing
The ideal hemostatic dressing should not only achieve the effect of hemostasis but also maintain a suitable moist environment and sufficient physical and mechanical strength and avoid secondary injury to the wound. Here, a stretchable, adhesive, and antibacterial hydrogel (SAQH) for wound hemostasis is facilely prepared by photopolymerization under green LED irradiation, in which acrylamide (AAM) and methacryloylethylsulfobetaine (SBMA) are used as the skeleton and quaternized carboxymethyl chitosan (QCCS) is used as the procoagulant component. The introduction of the macromolecular cross-linking agent methacryloyl hyaluronic acid (HA-GMA) enhances biocompatibility and avoids the addition of small molecular toxic cross-linking agents. The introduction of inorganic nanoparticle hydroxyapatite (HAP) into the hydrogel system not only improves the mechanical properties of the polymer network but also releases calcium ions from HAP to achieve a good coagulation-promoting effect. SAQH hydrogels have excellent mechanical properties (the maximum stress can reach 237 kPa), good adaptability, sufficient tissue adhesion, and effective antibacterial properties. In the mouse liver injury model, hydrogels can adhere to the bleeding site to reduce blood loss, and they will not cause secondary bleeding when removed. This research develops a potential hemostatic hydrogel with broad applicable prospects.
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Food Bioscience
·
2025
·
IF 5.9
Zhuo Xu,Bin Wu,Chunhua Wu,Qian Chen,Kaimeng Xu,Zhengjun Shi,Xiaoping Rao,Yanfei Niu
In order to obtain natural bio-antimicrobial agents with better antifungal activity, the present study compared the antifungal properties of different structural natural resin acid derivatives (dehydroabietic acid (DHA), acrylpimaric acid (APA), and maleopimaric anhydride (MPA)) grafted with chitosan C 2 -OH and investigated the relationship between structure and activity. The structures of the derivatives were determined by FTIR and 1 H NMR. The antifungal properties were determined by mycelial growth rate method. The results demonstrated that CS-DHA (CSDA) exhibited the capacity to inhibit the majority of the tested fungi with notable efficacy, with an optimal antifungal effect observed at 97.53% against Alternaria solani . CS-APA (CSAA) demonstrated a comparatively weaker antifungal effect in comparison to CSDA, yet it exhibited a stronger effect when compared to CS-MPA (CSMA). SEM, TEM and relative permeability of cell membranes proved that the derivatives inhibited fungal growth by destroying the cell wall structure. The in vivo experiments proved that the derivatives all have the effect of protecting chili peppers, which has some application prospects. The best curative effect of CSAA on chili was observed at 1.5 mg/mL concentration (21.04%). At 3 mg/mL concentration, CSDA showed the best protective effect (29.48%) against chili peppers, which was closest to the effect of Imazalil at the same concentration. Meanwhile, the three derivatives had good preservation effect on cherry tomatoes, and the longest one could extend the shelf life by 6 days.
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