TALANTA
·
2023
·
IF 6.1
Yuwei Hu,Qin Zeng,Yifan Hu,Jinyun He,Heye Wang,Chunyan Deng,Dai Li
Bacterial infections can significantly impair wound healing. Therefore, it is essential to develop wound dressings with high antimicrobial activity. Hydrogels are often used as wound dressings due to their excellent physicochemical properties. Herein, by cross linking sodium alginate (SA), agar (AG) with Ti 3 C 2 T x MXene and Zinc ions (Zn 2+ ), a biosafe composite hydrogel (MSG-Zn 2+ ) was developed for fast and efficient sterilization treatment. The excellent photothermal properties of Ti 3 C 2 T x MXene and the chemical antimicrobial activity of Zn 2+ enable synergistic photothermal therapy (PTT)/chemical therapy in NIR biowindow with reduced power density and improved antimicrobial efficiency. More importantly, the incorporation of Zn 2+ can enhance the effective contact between the hydrogel and bacteria, benefiting both photothermal and chemical antibacteria. In vitro antibacterial experiments showed that MSG-Zn 2+ has a broad-spectrum antibacterial effect against Gram-positive Staphylococcus aureus ( S. aureus ) and Gram-negative Escherichia coli ( E. coli ). Cellular experiments showed that the hydrogel had excellent biocompatibility and the released Zn 2+ stimulated cell migration. In addition, the prepared MSG-Zn 2+ hydrogel has other advantages such as hydrophilic, high swelling, simple and low cost preparation, which meets the requirements of an economical wound dressing. This proposed work shows that this composite hydrogel MSG-Zn 2+ has great potential for practical antimicrobial wound dressing applications.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Xingyun Ye,Yingjiao Ma,Zhuoyue Tian,Hanxue Sun,Zhaoqi Zhu,Jiyan Li,Weidong Liang,An Li
Photothermal energy conversion and storage though phase change materials (PCMs) composites is one of the ideal methods for the efficient utilization of solar energy which is regarded as the cleanest and most sustainable renewable energy. Herein, a series of Ti 3 C 2 -introduced PCMs composites were developed by melt-dipping method exploiting MXene/sodium alginate/carbon nanotubes (CNTs) hybrid aerogels as supporting materials and tetradecylamine (TDA) as the impregnated PCM. The utilization of MXene is to enhance the light absorption performance of PCM composites which has significantly improved their absorbance under an extremely high loading rate exceeding 91.0 wt%. This result contributed to a high photothermal energy conversion efficiency up to 84.95% and an excellent thermal energy storage density with a relatively high latent heat up to 217.8 kJ/kg. Notably, the hybrid TDA/aerogel composites also exhibited remarkable cycling and crystallinity stability; their melting enthalpy still maintain up to 192.0 kJ/kg after 300th thermal and cooling cycles. Additionally, the obtained PCM composites also possess marvelous mechanical property and enhanced thermal conductivity . The excellent comprehensive performance demonstrated that the resultant composites show great potential application in solar energy conversion and storage.
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FOOD HYDROCOLLOIDS
·
2022
·
IF 11.504
Yuanyuan Liu,Yifan Zhang,Meiyang Zhen,Yuangen Wu,Meihu Ma,Yuxin Cheng,Yongguo Jin
The catechin and tannins as crosslinking and antioxidant compounds were added into sodium alginate/gelatin/poly(vinyl alcohol) (SA/GEL/PVA) blend film with 0.5%, 2%, and 5% (based on the total mass of polymers), respectively. This study aims to investigate the effect of different polyphenols on the structural and functional properties of food packaging film. Molecular interactions among polyphenols and polymers in film-forming solution (FFS) were analyzed based on the rheological behavior, low field nuclear magnetic resonance (LF-NMR), and the changes in structural characteristic of modified films were analyzed through Fourier transform infrared spectra (FTIR), Scanning electron mcroscopy (SEM) and X-ray diffraction (XRD) analysis. The results indicated that the crosslinking degree of the polymer network in FFSs modified by tannins was higher than that of catechin. The mechanical properties, water insolubility, water vapor barrier performance and antioxidant activity of the blend film were improved by polyphenols addition. The film modified by 2% tannins showed the highest tensile strength and elongation at break in comparing with catechin modified films. This study demonstrated that the tannins have a great potentiality in enhancing the structure and function of SA/GEL/PVA blend film.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yulai Zhao,Zhongzheng Zhu,Anjun Wang,Longqiang Xiao,Linxi Hou
Porous carbon materials have been widely used as electrode materials for supercapacitors . However, low specific capacitance severely hinders the practical application. To further improve the capacitance, this work reports a facile approach to prepare N, S co-doped hierarchical porous carbon/MnO 2 composites (NSPC/MnO 2 ). Acidified thiourea, acting as N and S source, is used to crosslink sodium alginate (SA) to give SA-based composite gels which are pyrolyzed to produce NSPC/MnO 2 . X-ray diffraction and X-ray photoelectron spectra proved that manganese exists in the porous carbon in the form of MnO 2 . The obtained NSPC/MnO 2 exhibit hierarchical porous structure, remarkable mesoporous feature (the proportion of mesopores and macropores reached 32.69%), and high specific surface area of 1701 m 2 g −1 . Meanwhile, NSPC/MnO 2 show abundant heteroatom doping, i.e. Mn (2.05 at%), N (6.76 at%), and S (2.16 at%), which provided plenty of pseudocapacitance. The electrochemical tests show that NSPC/MnO 2 as electrode material can reach a high specific capacity of 281.1 F g −1 at 1 A g −1 (which is almost 1.85 times higher than the comparative sample), with good cycling stability (86.02% after 5000 cycles at 10 A g −1 ).
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Scientific Reports
·
2022
·Vol. 12
·期 1
·1-12
·
IF 4.996
Zhang Zhi-xuan,Lv Lu,Shi Ai-hua,Li Yun-hao,Wang Tian-ren,Guo Yuan-hang,Hu Bao-juan,Yan Xiao-peng,Fu Jun-ke,Ma Feng,Wang Hao-hua,Lv Yi,Zhang Yong
Many methods are used to locate preoperative small pulmonary nodules. However, deficiencies of complications and success rates exist. We introduce a novel magnetic gel for small pulmonary nodules localization in rabbit model, and furtherly evaluate its safety and feasibility. Rabbits were used as the experimental objects. A magnetic gel was used as a tracer magnet, mixed as sodium alginate-Fe 3 O 4 magnetic fluid and calcium gluconate solution. In short-term localization, a coaxial double-cavity puncture needle was applied to inject the gel into the lung after thoracotomy, and a pursuit magnet made of Nd-Fe-B permanent magnetic materials was used to attract the gel representing location of the nodule. In long-term localization, the gel was injected under X-ray guidance. Imaging changes to the lung were observed under X-ray daily. Thoracotomy was performed to excise tissue containing the gel, and hematoxylin–eosin staining was used to observe the tissue on postoperative days 1, 3, 5, and 7. Observe tissues morphology of heart, liver, spleen, and kidney in the same way. The gel was formed after injection and drew lung tissue to form a protrusion from the lung surface under the applied magnetic field. No complication was observed. The shape and position of the gel had not changed when viewed under X-ray. Pathological analysis showed the gel had a clear boundary without diffusion of magnetic fluid. All tissues retained good histologic morphology and no magnetic fluid was observed. Our study preliminarily suggested that the technique using sodium alginate-Fe 3 O 4 magnetic gel to locate small pulmonary nodules with guidance of X-ray, and to search for them under an applied magnetic field during the operation is safe and feasible.
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Food Packaging and Shelf Life
·
2022
·
IF 8.749
Jingwen Chen,Yinxuan Li,Yifen Wang,Salimata Yakubu,Haibing Tang,Li Li
Most edible films/coatings including those made of gelatin cannot be used independently as packaging films. In this study, active fish gelatin-based bilayer packaging films were developed and applied to preserve Japanese sea bass. The coating method was applied to produce polylactic acid/tilapia fish gelatin-sodium alginate bilayer film (PLA/FGSA). β -cyclodextrin inclusion complexes of cinnamaldehyde ( β -CD-CI) and thymol ( β -CD-Ty) were added into the gelatin-based layer of the PLA/FGSA to obtain active bilayer films (PLA/FGSA-CI and PLA/FGSA-Ty). This combination improved the oxygen and water vapor barrier abilities of the films, compared with PLA and edible gelatin-based monolayer films. Both active bilayer films possessed strong antibacterial and antioxidant activities . PLA/FGSA-Ty film showed the most effective inhibition against the growth of Pseudomonas .spp and H 2 S-producing Shewanella , generation of total volatile basic nitrogen (TVB-N) and thiobarbituric acid reactive substances (TBARS) of fish meat. These results indicate the active bilayer films are promising in the preservation of seafood.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2022
·Vol. 331
·期 6
·2795-2804
·
IF 1.754
Luo Qingyun,Jin Tianxiang,huang Jie,Liu Zhirong,Huang Dejuan,Qian Yong
Abstract A novel phytic acid-doped sodium alginate aerogel (Alg-PA) was prepared via a simple doping and freeze-drying method and was used as a self-supporting electrode material to remove uranium ions from aqueous solutions. The effects of chemical composition, UO 2 2+ concentration, solution pH, and applied voltage on the adsorption of UO 2 2+ were investigated. Chemical adsorption was found to be the main mechanism of uranium adsorption and the application of voltage can effectively improve the adsorption capacity and adsorption rate in this removal system. The experimental maximum capacity of the Alg-PA electrode was 430.8 mg/g, while the theoretical maximum capacity of Alg-PA was found to be 563.8 mg/g. Moreover, Alg-PA also has a good reusability and selectivity to uranium ions. These advantages make Alg-PA a promising material for extracting of uranium from uranium-containing solutions. Graphical abstract
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2022
·
IF 2.042
Houkui Gong,Qichang Zhou,Feilin Lin,Wenqi Qin,Siqi Zhang,Shujuan Yang,Jiacheng Li,Yuhong Feng
Control over the self-assembly of micro- and nano-scopic building blocks is highly important but very challenging in the fabrication of many hierarchical composite materials. We prepared a novel electrospun nanofiber on the basis of Pickering emulsion synergy-stabilized by titanium dioxide/modified sodium alginate/polyoxyethylene(TiO2/Ugi-Alg/PEO). The emulsion stability was evaluated using turbiscan stability index, rheology and confocal laser scanning microscope. The results showed that TiO2/Ugi-Alg/PEO could form a relatively thick interfacial particle film at the oil-water interface, which was helpful to reduce the extent of agglomeration among droplets due to the steric hindrance mechanism. Pickering emulsion was utilized as a template to prepare nanofibers with uniform and orderly distribution of TiO2 by electrospinning technology, which had a good photodegradation effect on pesticide lambda-cyhalothrin residues. The self-assembly of nanoparticles at the oil-water interface and its combination with electrospinning technology to prepare nanofibers containing TiO2 photodegradation activity are expected to be a new strategy to avoid pesticide long persistence period in the soil environment.
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Soft Matter
·
2022
·Vol. 18
·期 8
·1644-1652
·
IF 4.046
Wenshuai Zhang,Lingxiao Xu,Meijin Zhao,Yuning Ma,Ting Zheng,Lei Shi
Developing multifunctional hydrogels with stretchability, self-healing ability, adhesiveness, and conductivity into flexible strain sensors for human motion and health monitoring has attracted great attention and is highly desired. However, the present motion detectors mainly focus on stretching, bending, and twisting of different body parts while the expansion–contraction motion has been rarely investigated. In this study, along with carbon nanotubes (CNTs) as conductive components, sodium alginate (Alg) modified with 3-aminophenylboronic acid (PBA) and dopamine (DA) were synthesized and employed as precursors to prepare a multifunctional Alg-CNT hydrogel. The formed dynamic covalent bonds between PBA and DA endowed the hydrogel with a rapid self-healing property (30 s) while the introduction of CNTs remarkably enhanced the mechanical strength and electrical conductivity of the hydrogel. Moreover, the as-prepared hydrogel displayed a satisfactory stretchability (500%) and self-adhesiveness to various substrates. When used as a strain sensor, the Alg-CNT hydrogel that exhibited a fast response (150 ms) and ultra-durability (over 30 000 cycles) was demonstrated to be capable of monitoring subtle expansion–contraction motions (e.g., human breathing and mouse heart beating) via periodic and repeatable electrical signals. Therefore, this multifunctional hydrogel is highly suitable for monitoring expansion–contraction motions, indicating its potential applications in personal health monitoring.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Xin Jing,Xia Li,Yifei Jiang,Jiang Lou,Zhuqing Liu,Qijun Ding,Wenjia Han
Degradable bio-based materials have been widely considered as functional coatings, however, it is a great challenge to fabricate biodegradable coatings with high barrier, water- and oil- resistance. In this work, such coatings were fabricated by using collagen fibers (CF), sodium alginate (SA), and polyvinyl butyral (PVB). CF and SA were mixed evenly and coated on Ca 2+ pretreated filter paper. It was mainly due to the electrostatic adsorption between collagen fibers and sodium alginate , and the crosslinking between the adsorption products and Ca 2+ . By coating PVB solution, the barrier performance was further improved. Notably, the composite exhibited excellent water vapor resistance (48 g/m 2 ·24 h), water resistance (31 g/m 2 ), oil resistance (kit rating: 12/12) and good mechanical properties. This degradable, environmentally friendly, and simple composite paper method has excellent barrier properties, mechanical properties and fluorine-free properties, and will have many applications in the food and packaging fields.
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Journal of Functional Biomaterials
·
2026
·Vol. 17
·期 9
·473
·
IF 5.9
Jiacheng Yu,Chengming Wang,Xiue Ren,Huixia Wang,Yiqiang Huang,Changren Zhou
Elevated levels of reactive oxygen species (ROS) and persistent inflammatory responses represent principal impediments to efficacious wound healing, particularly in mechanically dynamic or infected wound environments. Consequently, multifunctional hydrogel-based dressings capable of integrating coordinated antioxidant, anti-inflammatory, and antimicrobial activities with robust wet-tissue adhesion are highly sought after, yet their development remains limited. Herein, we introduce a curcumin-functionalized polyurethane composite dressing (designated CPFSD), engineered through the incorporation of dopamine-grafted sodium alginate (SD) and ferrocene (Fc), which collectively confer synergistic ROS modulation alongside durable tissue adhesion. Mechanistically, curcumin provides intrinsic antioxidant and anti-inflammatory properties, while Fc facilitates reversible Fe2+/Fe3+redox cycling, thereby augmenting ROS scavenging capacity; concurrently, catechol and hydroquinone moieties present on SD establish stable interfacial interactions with moist biological tissues. Comprehensive physicochemical characterization revealed that CPFSD effectively scavenged over 80% of both DPPH and hydroxyl (·OH) radicals, exhibited greater than 80% antibacterial efficacy against Escherichia coli and Staphylococcus aureus, and demonstrated markedly enhanced adhesive performance while preserving mechanical flexibility and cytocompatibility. In vitro assays further indicated that CPFSD significantly attenuated oxidative stress in L929 fibroblasts and RAW264.7 macrophages, accompanied by downregulation of pro-inflammatory cytokine expression. In a murine full-thickness excisional wound model, CPFSD facilitated accelerated epithelialization, angiogenesis, and wound contraction, achieving wound closure at day 11 without observable systemic toxicity. Collectively, these findings underscore that rational multicomponent design strategies can yield adhesion-capable wound dressings endowed with synergistic therapeutic functionalities suitable for addressing complex pathological wound conditions.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Zhaoxia Tang,Jiali Luo,Yahya Faqir,Yu Zhang,Wenqian Xue,Hongmei Zhao,Ali Murad Jakhar,Chengjia Tan,Jiahua Ma
Berberine hydrochloride (BH) has long been known for its therapeutic efficacy. In the present study, we aimed to treat mice with colitis using dung beetle chitosan (DCS) -transported BH. To achieve this, BH-loaded DCS/sodium alginate microspheres (SA-DCS-BH) were prepared. The SA-DCS-BH was characterized using SEM, DLS , FT-IR, and XRD, then was used for administration and anti-inflammatory examination in mice. SEM and DLS confirmed the surface morphology of the microspheres, and the particle size was relatively uniform. FT-IR and XRD results confirmed that BH was successfully loaded. In vitro and in vivo studies showed that SA-DCS-BH had slow-release ability. After treatment with SA-DCS-BH, DAI was significantly reduced, colon weight and length increased, spleen length and weight reduced, concentrations of pro-inflammatory cytokines in colonic tissues were reduced, and gut microbiota species abundance was modulated. In addition, this study found a correlation between specific microbes and colitis indicators, Muribaculaceae showed sequential growth after receiving BH, SA-CS-BH, and SA-DCS-BH treatments, respectively. It was concluded that SA-DCS-BH effectively delivered the BH to the intestine with slow-release ability and exhibited anti-inflammatory effects by immune response. Compared to commercial chitosan, DCS has potential for modulating intestinal microorganisms and more suitable carrier for intestinal drug delivery systems.
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