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Chinese Journal of Polymer Science 2024年第8期42卷 1147-1155页

作者： Wen-Jun Feng Yan-He Wu Xiao-Yang Liu Zheng-Ke Wang MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310058China

Shear-thinning hydrogels have emerged for endoscopic submucosal dissection,while wound intervention after surgery has rarely been ***,a catechol-modified chitosa n hydrogel with shear-thinning property was developed for simultaneously facilitating endoscopic submucosal dissection and postoperative wound *** from the shear-thinning and self-healing characteristics,the asprepared hydrogel showed easily endoscopic *** also performed very well as submucosal cushion,which could remain above 70%after injection for 120 min in ex vivo porcine large intestine *** fact,the cushion height of normal saline dramatically decreased to 46%of the initial height at 30 *** nanoparticles encapsulated into the network endowed the hydrogel with almost reached 100%antibacterial effect against *** and *** hemolysis ratio of the hydrogel was calculated to be as low as 0.8%.Combined with good hemocompatibility and cytocompatibility,the as-prepared hydrogel displayed much higher in vivo wound closu re and healing efficacy than normal *** results demonstrated the superiority of the shear-thinning chitosan hydrogel in facilitating clinical endoscopic submucosal dissection surgery.

关键词： Shear-thinning hydrogel Endoscopic mucosal dissection Wound healing Catechol-modified chitosan silver nanoparticles

Green Synthesis of silver nanoparticles Using Aqueous Orange and Lemon Peel Extract and Evaluation of Their Antimicrobial Properties

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Advances in nanoparticles 2024年第2期13卷 11-28页

作者： Amra Bratovcic Amna Dautovic Department of Physical Chemistry and Electrochemistry Faculty of Technology University of Tuzla Tuzla Bosnia and Herzegovina Multilab Tuzla Bosnia and Herzegovina

Green synthesis of silver nanoparticles (AgNPs) using aqueous extracts of orange and lemon peels, as a reducing agent, and silver nitrate salts as a source of silver ions is a promising field of research due to the versatility of biomedical applications of metal nanoparticles. In this paper, AgNPs were synthetized at different reaction parameters such as the type and concentration of the extracts, metal salt concentration, temperature, speed stirring, and pH. The antibacterial properties of the obtained silver nanoparticles against E. coli, as well as the physical and chemical characteristics of the synthesized silver nanoparticles, were investigated. UV-Vis spectroscopy was used to confirm the formation of AgNPs. In addition to green biogenic synthesis, chemical synthesis of silver nanoparticles was also carried out. The optimal temperature for extraction was 65˚C, while for the synthesis of AgNPs was 35˚C. The synthesis is carried out in an acidic environment (pH = 4.7 orange and pH = 3.8 lemon), neutral (pH = 7) and alkaline (pH = 10), then for different concentrations of silver nitrate solution (0.5 mM - 1 mM), optimal time duration of the reaction was 60 min and optimal stirring speed rotation was 250 rpm on the magnetic stirrer. The physical properties of the synthesized silver nanoparticles (conductivity, density and refractive index) were also studied, and the passage of laser light through the obtained solution and distilled water was compared. Positive inhibitory effect on the growth of new Escherichia coli colonies have shown AgNPs synthesized at a basic pH value and at a 0.1 mM AgNO3 using orange or lemon peel extract, while for a 0.5 mM AgNO3 using lemon peel extract.

关键词： Green Synthesis silver nanoparticles Orange and Lemon Peel Extract Antibacterial Activity Escherichia coli

silver nanoparticles on UiO-66(Zr)metal-organic frameworks for water disinfection application

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Food Science and Human Wellness 2022年第2期11卷 269-276页

作者： Hui Chen Chen Qiu Yiran Jiang Xinyu Liao Dan Wu Mofei Shen Tian Ding College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhou 310058China

Drinking water disinfection is an essential process to assure public health all over the *** this study,silver nanoparticles(AgNPs)on UiO-66(Zr)Metal-Organic Frameworks(Ag@UiO-66)is proposed as a potential water disinfection *** are synthesized using polyvinyl pyrrolidone(PVP)as stabilizing agent,and sodium borohydride as reducing agent are subsequently embedded on UiO-66,a high-stability organometallic *** effect of premixing time,reaction time and reactant concentration on the loading rate of AgNPs on UiO-66 was *** maximum load rate of AgNPs on UiO-66 could reach 13%when the premixing time is 3 h,the reaction time is 45 min and the concentration of AgNO_(3) is10μg/*** formation of AgNPs loaded on UiO-66 was observed and confirmed with ultraviolet and visible spectrophotometry(UV-Vis),scanning electron microscopy(SEM),infrared emission spectroscopy(IES)and X-ray diffraction(XRD)***@UiO-66 exhibited strong antibacterial activity against both Gramnegative Escherichia coli and Gram-positive Staphylococcus aureus,with minimum inhibitory concentrations(MIC)of 64 and 128μg/mL,*** germicidal efficacy of Ag@UiO-66 enhanced significantly as the temperature rose from 4℃to 37℃.The results indicate that Ag@UiO-66 is potential candidate as a feasible water disinfection material.

关键词： Metal-organic framework silver nanoparticles Antibacterial effects Water disinfection

Biosynthesis of silver nanoparticles with Clerodendron phlomoides Leave Extract:Particle Morphology,Antimicrobial Potential and Application

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Journal of Clinical and Nursing Research 2024年第1期8卷 51-64页

作者： Kirubanandan Shanmugam Subha Veeramani Renganathan Sahadevan Saveetha School of Engineering SIMATSChennai 602105India National Centre for Nanoscience and Nanotechnology University of MadrasGuindy CampusChennai 600025India Centre for Biotechnology A.C.TechAnna UniversityChennai 600025India

silver nanoparticles are versatile nanomaterials that have found numerous applications in various *** use of plant extract for the synthesis of silver is a green and sustainable *** phlomoides leaves extract has been found to contain various phytochemicals,such as phenols,flavonoids,tannins,and alkaloids,which possess reducing and stabilizing properties that can aid the production of silver *** this paper,morphological and topographical analyses were performed on silver *** biosynthesized silver nanoparticles showed antimicrobial potential against wound *** and TEM micrographs revealed that the particles were sphere and nanosized,which makes them suitable for various biomedical applications.

关键词： silver nanoparticles Clerodendron phlomoides Biosynthesis Morphology SEM TEM FTIR Antimicrobial activity and wound pathogens

Biogenic synthesis of silver nanoparticles using Persicaria odorata leaf extract: Antibacterial, cytocompatibility, and in vitro wound healing evaluation

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Particuology 2022年第11期70卷 10-19页

作者： Faridah Aminullah Lubis Nik Ahmad Nizam NikMalek Nor Suriani Sani Khairunadwa Jemon Department of Biosciences Faculty of ScienceUniversiti Teknologi Malaysia81310 UTMSkudaiJohorMalaysia Centre for Sustainable Nanomaterials(CSNano) Ibnu Sina Institute for Scientific and Industrial Research(ISI-ISIR)Universiti Teknologi Malaysia81310 UTMSkudaiJohorMalaysia Office of Deputy Vice Chancellor(Research and Innovation) Universiti Teknologi Malaysia81310 UTMSkudaiJohorMalaysia

Biogenic synthesis of silver nanoparticles(b-AgNPs)utilising plant extract has gained the interest of researchers due to the environmentally friendly and cost-effective ***,the extent of its application in the biomedical field remains *** study evaluates the antibacterial,cytocompatibility,and wound healing activities of synthesised AgNPs using Persicaria odorata leaves extract(PO-AgNPs).The formation of PO-AgNPs was observed by visual colour changes and verified by ultraviolet-visible(UV–vis)spectrophotometer,which revealed a surface plasmon resonance(SPR)at around 440 nm,and further confirmed by X-ray diffraction(XRD).Characterisation using Fourier transform infrared(FTIR)spectroscopy showed biomolecules from the leaves extract presented together on *** emission scanning electron microscope(FESEM)and high-resolution transmission electron microscopy(HR-TEM)images revealed PO-AgNPs nanospheres with diameters of 11±3 *** diffusion test(DDT)and minimum inhibitory concentration(MIC)analysis resulted in a dose-dependent inhibition of PO-AgNPs against tested Staphylococcus epidermidis and Methicillin-resistant Staphylococcus aureus(MRSA).These results were further corroborated by time-kill kinetic assay which revealed that PO-AgNPs were bactericidal against both strains 24 h *** and in vitro wound healing evaluation against normal human fibroblast cells,HSF 1184 inferred that PO-AgNPs are non-toxic to normal cells and able to enhance cell migration as compared to the non-treated ***,PO-AgNPs are biocompatible and possess antibacterial and wound healing capabilities that are useful in biomedical applications.

关键词： silver nanoparticles Biosynthesis Antibacterial Cytocompatibility Wound healing

Enhanced photo-driven ion pump through silver nanoparticles decorated graphene oxide membranes

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Nano Research 2022年第1期15卷 612-616页

作者： Yaping Feng Haoyu Dai Yi Zhang Jianjun Chen Fengxiang Chen Lei Jiang CAS Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology Engineering Research Center oj BeijingBeijing University of TechnologyBeijing 100124China Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200China

Biology systems harvest solar energy to regulate ions and molecules precisely across cell membrane that is essential to maintain their life ***,artificial light-driven directional ion transport through graphene oxide membranes has been established,where the membrane converts light power into a transmembrane motive ***,we report a silver nanoparticles decorated graphene oxide membranes for enhanced photo-driven ionic *** light stimulated charge carrier dynamics,such as advanced light absorption efficiency,extended lifetime and efficient separation of photo-excited charge carriers,are account for the ion-driven force *** on metal nanoparticles decoration,the concept of the guest-interactions of plasmon-enhanced photo-driven ion transport in two-dimentional layered membranes will stimulate broad researches in sensing,energy storage and conversion and water treatment.

关键词： ion pump silver nanoparticles nanofluidics photocurrent

Effects of silver nanoparticles on Denitrification and Associated N_(2)O Release in Estuarine and Marine Sediments

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Journal of Ocean University of China 2022年第1期21卷 131-140页

作者： SUN Pengfei LI Kuiran YI Shaokui LI Hui CHEN Xi Fourth Institute of Oceanography Ministry of Natural ResourcesBeihai 536000China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China College of Marine Life Science Ocean University of ChinaQingdao 266003China College of Life Sciences Huzhou UniversityHuzhou 313000China

silver nanoparticles(AgNPs)have been widely used in medicine and consumer *** it enters the river in dif-ferent ways,then finally converges to the ocean through the *** polution can affect NO_(2)−and N_(2)O production by denitri-fiers in aquatic *** effects of AgNPs on denitrification activity,nitrogen transformation and nitrous oxide(N_(2)O)emission were investigated in Dagu River Estuary(DRE)and Jiaozhou Bay(JZB).The results showed that the potential denitrification activity(PDA),NO_(3)−and NO_(2)−reduction rates decreased with an increase of AgNPs concentration in DRE and ***,the N_(2)O ac-cumulation was significantly increased at AgNPs concentrations above 5 mg kg^(−1)in both areas,and the accumulation rate was greater in estuary than in bay(P0.05)in DRE and ***,the relative abundance of narG,nirS and nosZ gene in two areas decreased with the increase of AgNPs concentration,and the negative effect of AgNPs varied in order:nosZ>nirS>narG,inferring that the expression of denitrifying related genes could be significantly and differently inhibited by AgNPs ***,this study demon-strated that the inhibitory effect of AgNPs on different denitrification process,which may lead to the increase of inorganic nitrogen accumulation and N_(2)O *** study provides a scientific basis for the further studies of AgNPs on the ecological impact mechanism and environmental effects of offshore sedimentary environment.

关键词： nitrous oxide silver nanoparticles denitrification estuarine and marine sediments

Antibacterial Chitosan-Gelatin Microcapsules Modified with Green-Synthesized silver nanoparticles for Food Packaging

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Journal of Renewable Materials 2023年第1期11卷 291-307页

作者： Long Li Yanan Lu Yu Chen Jiayi Bian Li Wang Li Li Engineering Research Center of Food Thermal-Processing Technology College of Food Science and TechnologyShanghai Ocean UniversityShanghai201306China

silver nanoparticles(Ag NPs)are an effective antibacterial agent,but their application in food packaging is limited due to their easy agglomeration and *** this study,antibacterial microcapsules were fabricated using Ginkgo biloba essential oil(GBEO)as core material and chitosan and type B gelatin biopolymer as capsule *** antibacterial microcapsules were then modified with green-synthesized Ag NPs,blended into the bio-polymer polylactic acid(PLA),and finally formed as *** properties and antibacterial activity against Escherichia coli(***)and Staphylococcus aureus(***)were *** showed that the prepared antibacterial PLA films exhibited excellent antibacterial activity against foodborne *** TVC exceeded the limit value of 7 log CFU/g at 7 days compared with the 5 days of pure PLA ***,these films can extend the shelf life of grass carp fillets by 2–3 days under refrigeration.

关键词： silver nanoparticles chitosan gelatin microcapsules antibacterial activity food packaging

Molluscicidal effect of green synthesized silver nanoparticles using Azadirachta indica on Biomphalaria alexandrina snails and Schistosoma mansoni cercariae

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Asian Pacific Journal of Tropical Biomedicine 2023年第1期13卷 35-44页

作者： Salwa S.Younis Iman F.Abou-El-Naga Khaled H.Radwan Medical Parasitology Department Faculty of MedicineAlexandria UniversityAlexandriaEgypt Agriculture Genetic Engineering Research Institute CairoEgypt

Objective:To assess the molluscicidal effect of the eco-friendly green synthesized neem silver nanoparticles(neem-Ag NPs)against Biomphalaria alexandrina,the snail intermediate host for Schistosoma mansoni,and their cercaricidal ***:Methanol extracts from neem fruits were used for green synthesis of neem-Ag *** neem-Ag NPs were characterized using UV-visible absorption spectra,dynamic laser light scattering technique,and transmission electron *** potential molluscicidal effect against adult and juvenile Biomphalaria alexandrina and the effect of the sub-lethal concentration on hatching of snail eggs and Schistosoma mansoni cercariae were ***:The surface plasmon resonance of neem-Ag NPs showed a sharp absorption peak atλ_(max)=518 nm together with multiple *** hydrodynamic diameter was(77.15±34.53)nm,the polydispersity index(0.338±0.000)and the zeta-potential-14.07 ***,transmission electron microscopy showed that the average size of the nanoparticles was(27±2)*** was evident and a light-colored capping layer could be seen coating the *** snails(LC_(50):0.83 ppm)were more susceptible to neem-Ag NPs than adults(LC_(50):1.07 ppm).In addition,neem-Ag NPs and neem at LC_(50)concentrations inhibited the egg-hatching of snails and showed cercaricidal activity in a time-dependent ***:Neem-Ag NPs have lethal activities against Biomphalaria alexandrina snails and their eggs,as well as Schistosoma mansoni ***,neem-Ag NPs could be a potential agent to control schistosomiasis.

关键词： Biomphalaria alexandrina Neem Schistosoma mansoni Azadirachta indica silver nanoparticles Molluscicide

silver nanoparticles tolerant bacteria from sewage environment

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Journal of Environmental Sciences 2011年第2期23卷 346-352页

作者： Sudheer Khan Amitava Mukherjee Natarajan Chandrasekaran Nanobio-Medicine Laboratory School of Bio-Sciences and TechnologyVIT University

silver nanoparticle （SNP） is a threat to soil, water and human health. Protection of environment from silver nanoparticles is a major concern. A sewage isolate, Bacillus pumilus treated with SNPs showed similar growth kinetics to that without nanoparticles. A reduction in the amount of exopolysaccharides was observed after SNPs - B. pumilus culture supernatant interaction. The Fourier transform infrared spectroscopy （FT-IR） peaks for the exopolysaccharides extracted from the bacterial culture supernatant and＇the interacted SNPs were almost similar. The exopolysaccharide capping of the SNPs was confirmed by UV-Visible, FT-IR and X-ray diffraction analysis. The study of bacterial exopolysaccharides capped SNPs with E. coli, S. aureus and M. luteus showed less toxicity compared to uncoated SNPs. Our studies suggested that the capping of nanopartieles by bacterially produced exopolysaccharides serve as the probable mechanism of tolerance.

关键词： Bacillus pumilus silver nanoparticles exopolysaccharides encapsulation bacterial tolerance toxicity reduction