ACS Applied Nano Materials
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2023
·
IF 5.9
Aiqin Zhang,Qikai Qiao,Zhen Pei,Zihao Wang,Jiandong Guo,Yuanqing Li,Guangmei Zhai,Pengfei Fei,Jianjun Lu,Husheng Jia
Much attention has been paid to compound a ZIF-8 antibacterial agent with textiles for recycling. However, antibacterial inactivation may be caused by dissolution of the ZIF-8 antibacterial agent in postfinishing technology. In this work, a nondissolution-bonded T-ZIF-8-PEG-TPU photocatalyst was prepared by covalent immobilization, and then, bonded antibacterial fibers T-ZIF-8-PEG-TPU were fabricated by electrospinning technology. The microstructure of the fibers was regulated by optimizing the spinning solution concentration, PEG content, and conductive salt content. The optimum process parameters are 22 wt % spinning solution, 3.3 wt % PEG, and 0.5 wt % ZnCl2 conductive salt. The intrinsic relationship between the fiber microstructure and photocatalytic antibacterial property, moisture permeability, and hydrophobicity was investigated. The antibacterial rate of the fiber membrane against Staphylococcus aureus reaches 100% after 30 min of visible light irradiation, and the antibacterial rate of Escherichia coli is 99.6% after visible light irradiation for 120 min. The fiber membrane has a standard grade I moisture permeability rate and a certain waterproof effect. It has potential applications in the field of health protection such as medical dressings and medical protective products.
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Advanced Healthcare Materials
·
2023
·
IF 10
Shunlan Chen,Dapeng Li,Ying Wen,Gege Peng,Kexin Ye,Yiwan Huang,Shijun Long,Xuefeng Li
Hydrogels usually are fabricated by using monomers or preexisting polymers in precursor solutions. Here, a polyelectrolyte complex biohydrogel (Bio-PEC hydrogel) made from a precursor dough, by kneading, annealing, and crosslinking the dough of two oppositely charged polysaccharides, cationic chitosan quaternary ammonium salt (HACC) and anionic sodium hyaluronate (HA), photoinitiator (α-ketoglutaric acid), crosslinker glycidyl methacrylate (GMA), and water of very small quantity is reported. Controlled kneading and annealing homogenized the dough with respect to transforming randomly distributed, individual polymer chains into tightly wound double-stranded structures, which, upon UV irradiation, covalently sparsely crosslinked into a highly entangled network and subsequently, upon fully swollen in water, results in Bio-PEC hydrogel, HACC/HA, exhibiting near-perfect elasticity, high tensile strength, and high swelling resistance. Via the same kneading and annealing, tetracarboxyphenylporphyrin iron (Fe-TCPP) metal nanoclusters are incorporated into HACC/HA to obtain photocatalytic, antibacterial, and biocompatible Bio-PEC hydrogel composite, Fe-TCPP@HACC/HA. Using SD rat models, the efficacy of Fe-TCPP@HACC/HA in inhibiting Escherichia coli ( E. coli ) growth in vitro and the ability to promote wound healing and scar-free skin regeneration in vivo, or its high potential as a wound dressing material for biomedical applications are demonstrated.
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CHEMICAL PHYSICS LETTERS
·
2023
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IF 2.8
Bo Li,Mohib Ullah Khan,Cheng Qv,Lin Chen,Ying Xiong,Lixin Zhang,Mingzai Wu
Conventional flexible zinc-air batteries (ZABs) electrolytes are mainly made of hydrogels, and thus can freeze at low temperatures and cause cell failure. Here, we report a gel electrolyte consisting of agar, polyacrylamide and dimethyl sulfoxide with high ionic conductivity (24 mS cm −1 ) at −30 °C. The flexible ZABs based on this gel electrolyte showed good cycling stability (45 h) at −30 °C, which provides a new idea for the development of low-temperature resistant flexible ZABs.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Xiangrong Li,Ruonan Xu,Li Shi,Tianjun Ni
In this work, four structurally similar flavonols (galangin, kaempferol , quercetin and myricetin) were coated on the surface of (11-mercaptoundecyl)- N , N , N -trimethylammonium bromide (MUTAB)‑gold nanoparticles (AuNPs) by two-step phase transfer and self-assembly, and the cationic MUTAB- AuNPs coated with flavonols (flavonol-MUTAB-AuNPs) were designed. Free radical scavenging and antibacterial experiments show that flavonol-MUTAB-AuNPs greatly improve the scavenging effect on DPPH, hydroxyl and superoxide anion radicals, and significantly enhance the inhibition effect on Staphylococcus aureus and Escherichia coli compared with flavonols and AuNPs. Then γ-globulin, fibrinogen , trypsin and pepsin were selected as representative proteins and their interaction with flavonol-MUTAB-AuNPs were investigated by various spectroscopic techniques . The fluorescence quenching mechanism of these four proteins by flavonol-MUTAB-AuNPs is static quenching. The binding constants K a between them are in the range of 10 3 to 10 6 . The interaction between them is endothermic, entropy-driven spontaneous process, and the main non-covalent force is the hydrophobic interaction. The effect of flavonol-MUTAB-AuNPs on the structure of the four proteins were investigated using UV–vis absorption spectra, synchronous fluorescence spectra and circular dichroism spectra. These results offer important insights into the essence of the interaction between flavonol-MUTAB-AuNPs and γ-globulin/fibrinogen/trypsin/pepsin. They will contribute to the development of safe and effective flavonol-MUTAB-AuNPs in biomedical fields.
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Foods
·
2023
·Vol. 12
·期 20
·3814
·
IF 5.2
Jiahang Yu,Mingyuan Huang,Huixin Tian,Xinglian Xu
The series of biochemical reactions, metabolic pathways, and regulatory interactions that occur during the storage of meat are the main causes of meat loss and waste. The volatile compounds produced by these reactions, such as hydrogen sulfide, acids, and amines, can directly indicate changes in the freshness of meat during storage and sales. In this study, a one-pot hydrothermal method based on a surface control strategy was used to develop nanoparticles of silver with different reactivities, which were further immobilized in agar powder to develop a colorimetric sensor array. Due to the different chemical interactions with various volatile compounds, the colorimetric sensor array exhibited distinct color changes. The study demonstrates significant differences between 12 different volatile compounds and provides a quantitative and visual method to reveal rich detection indicators. The colorimetric sensor array is an economical and practical multi-analyte identification method. It has many potential applications such as food packaging, anti-counterfeiting, health monitoring, environmental monitoring, and optical filters.Keywords:colorimetric sensor array;Ag NPs;VOCs;nanosensors;chilled broiler meat
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Advanced Science
·
2023
·Vol. 10
·期 30
·2303588
·
IF 15.1
Yuyang Yao,Junjie Mu,Yuan Li,Yanjing Ma,Jingwen Xu,Yuna Shi,Junbin Liao,Zhenlu Shen,Jiangnan Shen
Constructing a functional layer on the surface of commercial membrane (as a substrate) to inhibit the formation of biofilms is an efficient strategy to prepare an antibacterial anion exchange membrane (AEM). Herein, a rechargeable multifunctional anti-biological system is reported by utilizing the mussel-inspired L-dopa connection function on commercial AEMs. Cobalt nanoparticles (Co NPs) and N-chloramine compounds are deposited on the AEM surface by a two-step modification procedure. The anti-biofouling abilities of the membranes are qualitatively and quantitatively analyzed by adopting common Gram-negative ( E. coli ) and Gram-positive ( S. aureus & Bacillus ) bacteria as model biofouling organisms. The optimized membrane exhibits a high stability concerning the NaCl solution separation performance within 240 min. Meantime, the mechanism of the anti-adhesion is un-veiled at an atomic level and molecular dynamics (MD) simulation are conducted to measure the interaction, adsorption energy and average loading by using lipopolysaccharide (LPS) of E. coli . In view of the superior performance of antibacterial surfaces, it is believed that this work could provide a valuable guideline for the design of membrane materials with resistance to biological contamination.
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Acta Biomaterialia
·
2023
·
IF 9.7
Yingxin Zhu,Xianzhu Luo,Zihang Yu,Shihui Wen,Guochen Bao,Le Zhang,Cuiling Zhang,Yuezhong Xian
Methicillin-resistant Staphylococcus aureus (MRSA) is responsible for causing life-threatening infections that result in high morbidity and mortality rates. The development of advanced imaging and therapeutic methods for in vivo diagnosis and treatment of MRSA infections remains challenging. Here, we develop a hybrid nanoplatform based on rare-earth-doped nanoparticles (RENPs) sensitized by a moiety-engineered near-infrared (NIR) TPEO-820 dye and with a ZIF-8 layer that incorporates CysNO, a photochemically triggered nitric oxide donor. We then use the hybrid for both NIR-II bioimaging and photoactivatable treatment of MRSA-infected wounds. We show that the NIR dye sensitization leads to an 8.5-fold enhancement of the downshifting emission and facilitates deep-tissue NIR-II imaging of bacterial infections. Moreover, the sensitization strategy enhances the UV emission of RENPs by two orders of magnitude, leading to the efficiently controllable release of nitric oxide for effective disinfection of MRSA in vitro and in vivo. The hybrid nanoplatform thus offers promising opportunities for simultaneous localization and controllable treatment of MRSA. Statement of Significance Early detection and treatment of MRSA infections are crucial for reducing public health risks. It is a significant challenge that develops sensitive in vivo diagnosis and complete elimination of drug-resistant bacterial infections. Herein, a nanoplatform has been developed for photoactivatable therapy of MRSA infections and deep tissue NIR-II imaging. This platform utilizes lanthanide-doped rare earth nanoparticles (RENPs) that are sensitized by a moiety-engineered near-infrared (NIR) dye TPEO-820. The TPEO-820 sensitized RENPs exhibit 5 times increase in the release of NO concentration for MRSA treatment compared to unsensitized RENPs, enabling precise therapy of MRSA infection both in vitro and in vivo. Moreover, the platform demonstrates NIR-II luminescence in vivo, allowing for sensitive imaging in deep tissue for MRSA infection.
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MARINE POLLUTION BULLETIN
·
2023
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IF 5.8
Liuqin Zhang,Huali Li,Xiaohu Zhang,Qiuping Li,Guangyu Zhu,Fa-Qian Liu
We developed a marine coating consisting of Cu-MOF-74, multi-walled carbon nanotube containing carboxyl groups (MWCNT-COOH) and self-healing polymers, which simultaneously possesses self-healing and anti-biofouling properties. Cu-MOF-74 can stably release Cu 2+ by virtue of the coordination dissociative mechanism. Studies have proved that MWCNT can inhibit the growth of bacteria, so adding the MWCNT can help to reduce the amount of the copper ions and ensure the antibacterial effect of the coating. In addition, the cross-linked network and abundant -COOH provided by the polymers and MWCNT-COOH further prevent the loss of copper ions. Moreover, the coating we prepared has good performance of self-healing at room temperature or slightly heated because the polymers possess abundant non-covalent hydrogen bonds . Finally, the coating not only has superior antibacterial property , but also effectively prevents the adhesion of macrofouling organism. Therefore, the coating has a longer service life and its environmental friendliness has also been improved.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Wangkun Lai,Lin Wang,Yu Pang,Meihua Xin,Mingchun Li,Lulu Shi,Yangfan Mao
Chitosan quaternary phosphine salts (NPCS) were synthesized with enhanced antimicrobial properties using a two-step method. Composite films (CNSP) were prepared by incorporating NPCS and polyvinyl alcohol (PVA) as the base material, citric acid as the crosslinker and functional additive, exhibiting antibacterial and UV-blocking properties. The composite film showed a maximum tensile strength of 20.4 MPa, an elongation at break of 677%, and a UV light barrier transmittance of 70%. Application of these composite membranes in preserving strawberries demonstrated effectiveness in maintaining freshness by preventing water loss, inhibiting microbial growth , and extending shelf life. In addition, the composite film demonstrated biosafety. These results indicate that CNSP composite films holds significant promise for safe and sustainable food packaging applications.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Jiayi Zhou,Sai Zhang,Yu Zhang,Tianliang Liu,Shuying Yang,Gaopeng Lv,Yaping Wang,Kewei Feng,Yahong Yuan,Tianli Yue,Qinglin Sheng
Foodborne pathogens continue to pose a significant threat to human health. This study aims to enhance the antimicrobial activity of low-dose silver nanoparticles (AgNPs) against foodborne pathogens and use the enhanced AgNPs to preserve green grapes. A chemical delivery carrier for covalent organic frameworks (COFs) impregnated with AgNPs was developed. We investigated the bacteriostatic properties (minimum bacteriostatic concentration, bacteriostatic growth curve), the mechanism of action of the bacteriostatic agent, and the performance of the bacteriostatic film. The bacteriostatic preservation rate of the AgNPs@COFs composite on green grapes was evaluated. The minimum bacteriostatic concentration of the AgNPs@COFs composite was 10 μg/mL, and the bacteriostatic rate varied between 94.01 % and 98.77 %. The developed antibacterial AgNPs@COFs composite has potential applications in food packaging and preservation.
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CELLULOSE
·
2023
·Vol. 31
·期 2
·1159-1173
·
IF 5.7
Huang Juan,Zhang Alei,Xue Huihui,Zhou Jie,Ding Yajun,Xiao Zhongliang
Biological methods present a sustainable approach for treating various waste polymers due to green, low-cost, mild condition and simple operation. This study, a novel biological method to process nitrocellulose (NC) to obtain NC with low nitrogen via nitrate ester removal using fungal Chaetomium elatu m is proposed. The N% of NC continuously declined during the course of six days, from 13.06% to 11.71%, and the intensity of its energetic groups (O-NO 2 , -NO 2 ) also weakened. An examination of the thermal properties of NC revealed that the weight-loss ratio decreased after biotreatment from 86.33% (untreated NC) to 66.20% (treated NC).Furthermore, the kinetic parameters of the thermal decomposition reaction with DSC were calculated and the activation energy ( E a ) of biotreated NC was higher than that of the original, indicating the thermal stability was enhanced. Hence, this structure exploration and thermal analysis provide new methods for further investigating the mechanism of the biological denitrification process and assessing the safety of biotreated NC.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Ran Wang,Na Li,Bing Jiang,Jinghong Li,Wei Hong,Tifeng Jiao
Triple-network hydrogels have different network structures and diversified cross-linking methods, which make it expected to become a widely used soft material. In this work, the freezing method is used to form a hydrogen bond cross-linked physical network between the Agar molecular chains, and then acrylic acid (AAc) and a chemical cross-linking agent form a chemical cross-linked network using free radical polymerization. The polyvinyl alcohol (PVA) molecules in the hydrogel can increase the winding degree of the molecular chain and form the PVA semi-crystalline region. In addition, Fe 3+ in the system is coordinated and cross-linked with the carboxyl group on the PAAc molecular chain, and the addition of carbon nanotubes (CNTs) increases the mechanical properties and stability of the composite hydrogel. The prepared Agar/PAAc-Fe 3+ /PVA/CNTs composite hydrogel shows good mechanical properties through the coexistence of chemical covalent bonds and dynamic reversible bonds. Furthermore, the Agar/PAMAAc-Fe 3+ /PVA/CNTs triple-network hydrogel based on agar/polyacrylamide acrylic acid/polyvinyl alcohol (Agar/PAMAAc/PVA) was also prepared. Among them, acrylamide (AM) monomer and AAc monomer form a chemical cross-linking network through radical polymerization. The prepared Agar/PAMAAc-Fe 3+ /PVA/CNTs hydrogel can realize rapid self-recovery after 5 consecutive and discontinuous compressions, respectively. This work provides a new idea for the preparation of multifunctional hydrogels with good thermal stability, mechanical properties and self-recovery.
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