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Precise phase adjustment and antibacterial property of copper sulfide particles in confined mesoporous silica nanoreactor

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Particuology 2024年第2期85卷 113-121页

作者： Shiyu Xu Jinyong Wu Zhongzhen Ren Dechao Niu Low Dimensional Materials Chemistry Laboratory Key Laboratory for Ultrafine Materials of Ministry of EducationFrontier Science Center of the Materials Biology and Dynamic ChemistryShanghai Engineering Research Center of Hierarchical NanomaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai200237China

Bacteria-caused wound infection greatly threatens human health,thus developing an efficient and safe antibacterial agent without drug resistance is still a great challenge.Herein,a confined vulcanization strategy is proposed to construct copper sulfides-loaded dual-mesoporous silica nanospheres(Cux-Sy@DMSNs)with various crystal phases for reactive oxygen species(ROS)-mediated and photothermal antibacterial application.With the pore confinement of DMSNs,the crystal phases of copper sulfides including CuS,Cu_(9)S_(5)and Cui.96S can be easily controlled by changing the vulcanization temperature.The relationships between the crystal phases and photothermal properties as well as peroxidase-like activity of copper sulfides were systematically investigated.Results show that the obtained CuS@DMSNs exhibited higher photothermal ability with remarkable photothermal conversion efficiency of 36.86%in the second near-infrared region(NIR-II)and better peroxidase-like activity,compared to those of Cu_(9)S_(5)@DMSNs and Cu_(1.96)S@DMSNs.As a result,the in vitro experiments showed the good antibacterial effect against both gram-negative E.coli and gram-positive S.aureus under 1064 nm laser irradiation and the presence of H_(2)O_(2).Besides,the CCK-8 assay indicated that CuS@p-DMSNs have minimal cytotoxicity against normal human umbilical vein endothelial cells at the ranged concentrations.Therefore,the resultant CuS@p-DMSNs could act as a promising antibacterial agent for deep wound bacterial infection treatment.

关键词： Copper sulfides Mesoporous silica Photothermal Reactive oxygen species antibacterial agent

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Magnetic polyacrylonitrile/ZIF-8/Fe_(3)O_(4) nanocomposite bead as an efficient iodine adsorbent and antibacterial agent

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Chinese Journal of Chemical Engineering 2023年第9期61卷 210-220页

作者： Reza Sacourbaravi Zeinab Ansari-Asl Esmaeil Darabpour Department of Chemistry Faculty of ScienceShahid Chamran University of AhvazAhvazIran Department of Biology Faculty of ScienceShahid Chamran University of AhvazAhvazIran

The efficient adsorption of radioactive iodine(^(129)I and^(131)I)as nuclear waste is of great importance.Polymer nanocomposites consist of metal-organic frameworks(MOFs)developing for various pollutions sorption and separation have attracted much attention.This study reports the fabrication of magnetic polyacrylonitrile(PAN)/zeolitic imidazolate frameworks(ZIF-8)nanocomposites,PAN/ZIF-8(x%)/Fe_(3)O_(4),x=30 and 50,as iodine capture adsorbents.The PAN/ZIF-8(x%)/Fe_(3)O_(4)nanocomposite beads were fabricated via the phase inversion method,and their potential for iodine capture and separation in solution and vapor was investigated through UV-vis and weighing methods,respectively.Also,antibacterial activity of the as-prepared beads was assessed against E.coil and S.aureus.The as-fabricated compounds were studied by various techniques such as Fourier-transform infrared,X-ray diffraction,scanning electron microscope,energy-dispersive X-ray spectroscopy mapping,transmission electron microscope,N_(2)adsorption isotherm,and vibrating sample magnetometer.The iodine capture results showed that the efficiency of nanocomposites is remarkably higher than the pure PAN beads.Additionally,the asprepared nanocomposite adsorbents displayed higher capture capacities for iodine vapor(1524-4345mg·g^(-1))than iodine solution(187-295 mg·g^(-1)).The as-obtained magnetic nanocomposites can be successfully separated from polluted media by simple filtration or an external magnet,regenerated through washing with ethanol,and reused.Fast capturing,high sorption capacity,rapid separation,and good reusability make the PAN/ZIF-8(x%)/Fe_(3)O_(4)nanocomposites highly effective adsorbents for the separation of iodine from wastewater.Additionally,PAN/ZIF-8(50%)/Fe_(3)O_(4)bead can be considered as a potential new antibacterial agent for water and wastewater treatment.

关键词： ZIF-8 Polyacrylonitrile Composites Adsorption Waste treatment antibacterial agent

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Cow dung-derived biochars engineered as antibacterial agents for bacterial decontamination

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Journal of Environmental Sciences 2021年第7期33卷 33-43页

作者： Quanfu Yao Qinggele Borjihan Huihui Qu Yixuan Guo Ziying Zhao Long Qiao Ting Li Alideertu Dong Ying Liu College of Life and Environmental Sciences Minzu University of ChinaBeijing 100081China College of Chemistry and Environment Hohhot Minzu CollegeHohhot 010051China College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021China Engineering Research Center of Dairy Quality and Safety Control Technology Ministry of EducationInner Mongolia UniversityHohhot 010021China

Disposal of the pollutants arising from farming cattle and other livestock threatens the environment and public safety in diverse ways.Herein,we report on the synthesis of engineered biochars using cow dung as raw material,and investigating these biochars as antibacterial agents for water decontamination.By coating the biochars with N-halamine polymer and loading them with active chlorine (i.e.,Cl+),we were able to regulate them on demand by tuning the polymer coating and bleaching conditions.The obtained N-halamine-modified biochars were found to be extremely potent against Escherichia coli and Staphylococcus aureus.We also investigated the possibility of using these N-halamine-modified biochars for bacterial decontamination in real-world applications.Our findings indicated that a homemade filter column packed with N-halamine-modified biochars removed pathogenic bacteria from mining sewage,dairy sewage,domestic sewage,and artificial seawater.This proposed strategy could indicate a new way for utilizing livestock pollutants to create on-demand decontaminants.

关键词： Cow dung Biochars Polymer coating antibacterial agent Bacterial decontamination

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Eco-friendly method for synthesis of zeolitic imidazolate framework 8 decorated graphene oxide for antibacterial activity enhancement

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Particuology 2020年第2期18卷 24-32页

作者： Nazerah Ahmad Nik Abdul Hadi Md Nordin Juhana Jaafar Nik Ahmad Nizam Nik Malek Ahmad Fauzi Ismail Muhammad Nabil Fikri Yahya Siti Aishah Mohd Hanim Mohd Sohaimi Abdullah Advanced Membrane Technology Research Centre Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia Malaysian Institute of Chemical Engineering Technology-Universiti Kuala Lumpur Lot 1988Bandar VendorTaboh Naning78000 Alor GajahMelakaMalaysia Chemical Engineering Department Universiti Teknologi PETRONAS32610 Seri IskandarPerakMalaysia Department of Biosciences Faculty of ScienceUniversiti Teknologi Malaysia81310 SkudaiJohorMalaysia Centre for Student Innovation and Technology Entrepreneurship Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia

We report a rapid method for synthesis of zeolitic imidazolate framework 8(ZIF-8)-decorated graphene oxide(GO)composites(ZGO)with good antibacterial properties.The ZGO composites were synthesized at room temperature with low GO to metal salt ratios.The samples were characterized by X-ray diffraction,transmission electron microscopy,Fourier transform infrared spectroscopy,thermal gravimetric analysis,and surface area analysis.The characterization results show that ZIF-8 with a size of approximately 120 nm is successfully decorated on the surface of GO sheets with the host ZIF-8 framework maintained in the synthesized composite,but there is a significant reduction in the Brunauer-Emmett-Teller surface area.The antibacterial activities of the samples against Escherichia coli ATCC 11229 and Staphylococcus aureus ATCC 6538 as model strains of gram-negative and-positive bacteria,respectively,were determined by disc diffusion and minimum inhibitory concentration(MIC)tests.ZGO-1.0(1 wt%of ratio of GO to metal salt)shows the highest antibacterial activity with MIC values required to inhibit bacterial growth of E.coli and S.aureus of 5 times lower than those of pristine ZIF-8.Different antibacterial mechanisms are proposed based on field-emission scanning electron microscope images of the two bacteria after contact with the synthesized composite.Overall,owing to the simple synthesis,good stability,low chemical usage,and excellent antibacterial activity of the ZGO composites,they show great potential for application in the field of microbial contamination control.

关键词： Graphene oxide Metal-organic framework Hybrid nanocomposite Zeolitic imidazolate framework antibacterial agent

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Embedding ultrasmall Ag nanoclusters in Luria-Bertani extract via light irradiation for enhanced antibacterial activity

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Nano Research 2020年第1期13卷 203-208页

作者： Ziping Wang Yushuang Fang Xianfeng Zhou Zhibo Li Haiguang Zhu Fanglin Du Xun Yuan Qiaofeng Yao Jianping Xie Shandong Key Laboratory of Biochemical Analysis College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao266042China Weifang University of Science and Technology Shandong Peninsula Engineering Research Center of Comprehensive Brine UtilizationWeifang262700China Key Lab of Biobased Polymer Materials of Shandong Provincial Education Department School of Polymer Science and EngineeringQingdao University of Science and TechnologyQingdao266042China Department of Chemical and Biomolecular Engineering National University of Singapore4 Engineering Drive 4117585SingaporeSingapore

Ultrasmall silver nanoclusters(Ag NCs)with rich surface chemistry and good biocompatibility are promising in antibacterial application,however,further development of Ag NCs for practical settings has been constrained by their relatively weak antibacterial activity.Using the nutritionally-rich medium for bacteria(e.g.,Luria-Bertani(LB)medium)to coat active Ag NCs could further improve their antibacterial activity.Here,we provide a delicate design of a highly efficient Ag NCs@ELB antibacterial agent(ELB denotes the extract of LB medium)by anchoring Ag NCs inside the ELB species via light irradiation.The as-designed Ag NCs with bacterium-favored nutrients on the surface can be easily swallowed by the bacteria,boosting the production of the intracellular reactive oxygen species(ROS,about 2-fold of that in the pristine Ag NCs).Subsequently,a higher concentration of ROS generated in Ag NCs@ELB leads to enhanced antibacterial activity,and enables to reduce the colony forming units(CFU)of both gram-positive and gram-negative bacteria with 3–4 orders of magnitude less than that treated with the pristine Ag NCs.In addition,the Ag NCs@ELB also shows good biocompatibility.This study suggests that surface engineering of active species(e.g.,Ag NCs)with nutritionally-rich medium of the bacteria is an efficient way to improve their antibacterial activity.

关键词： Ag nanoclusters LB broth light irradiation antibacterial agent reactive oxygen species

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King cobra peptide OH-CATH30 as a potential candidate drug through clinic drug-resistant isolates

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Zoological Research 2018年第2期39卷 87-96页

作者： Feng Zhao Xin-Qiang Lan Yan Du Pei-Yi Chen Jiao Zhao Fang Zhao Wen-Hui Lee Yun Zhang Key Laboratory of Subtropical Medicinal Edible Resources Development and Utilization in Yunnan Province Department of Biology and Chemistry Puer University Puer Yunnan 665000 China Key Laboratory of Bioactive Peptides of Yunnan Province/Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences Kunming Institute of Zoology Kunming Yunnan 650223 China Department of Clinical Laboratories First Affiliated Hospital of Kunming Medical University Kunming Yunnan 650032 China Institute of Comparative Study of Traditional Materia Medica Institute of Integrative Medicine of Fudan University Shanghai 200433 China

Cationic antimicrobial peptides （AMPs） are considered as important candidate therapeutic agents, which exert potent microbicidal properties against bacteria, fungi and some viruses. Based on our previous findings king cobra cathelicidin （OH-CATH） is a 34-amino acid peptide that exerts strong antibacterial and weak hemolytic activity. The aim of this research is to evaluate the efficacy of both OH-CATH30 and its analog D-OH-CATH30 against clinical isolates comparing with routinely utilized antibiotics in vitro. In this study, 584 clinical isolates were tested （spanning 2013-2016） and the efficacy of the candidate peptides and antibiotics were determined by a broth microdilution method according to the CLSI guidelines. Among the 584 clinical isolates, 85% were susceptible to OH-CATH30 and its analogs. Both L- and D-OH-CATH30 showed higher efficacy against （toward） Gram-positive bacteria and stronger antibacterial activity against nearly all Gram-negative bacteria tested compare with antibiotics. The highest bactericidal activity was detected against Acinetobacter spp., including multi-drug-resistant Acinetobacter baumannfi （MRAB） and methicillin-resistant Staphylococcus aureus （MRSA）. The overall efficacy of OH-CATH30 and its analogs was higher than that of the 9 routinely used antibiotics. OH-CATH30 is a promising candidate drug for the treatment of a wide variety of bacterial infections which are resistant to many routinely used antimicrobial agents.

关键词： Cathelicidin antibacterial agent Clinicalisolates OH-CATH30

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Azobenzene quaternary ammonium salt for photo-controlled and reusable disinfection without drug resistance

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Chinese Chemical Letters 2023年第2期34卷 440-445页

作者： Yuhong Zhu Pengfei Li Caikun Liu Mengqi Jia Yadong Luo Dengfeng He Chunyan Liao Shiyong Zhang College of Chemistry Sichuan UniversityChengdu 610064China College of Biomedical Engineering and National Engineering Research Center for Biomaterials Sichuan UniversityChengdu 610064China

The abuse of antibiotics causes severe bacterial resistance, and the shortage of antibiotics has created a global public health crisis. This situation has prompted people to develop new antibacterial agents independent of traditional antibiotics. Here, we created a series of photosensitive azobenzene-quaternary ammonium salt smart antibacterial agents by connecting azobenzene with amines with different chain lengths to improve the antibacterial selectivity of quaternary ammonium salt(QAS) and prevent the accumulation of active QAS in the environment. After trans-cis isomerization, the solubility of the title compound(compound 4) increased and the antibacterial property enhanced. The experimental results suggested that the antibacterial effect of compound 4 was significantly enhanced after 365 nm light irradiation, and it had photosensitive intelligent antibacterial activity and could be reused. Notably, we did not obtain any mutants of Staphylococcus aureus or Escherichia coli resistant to compound 4. In general,compound 4 has the advantages of high yield, photo-controllable antibacterial properties, reusability, and does not induce bacterial resistance. This photosensitive antibacterial compound provides a new idea for the construction of intelligent disinfectants and is expected to be a candidate for disinfectants in public facilities and medical architecture.

关键词： Azobenzene Quaternary ammonium salt Photosensitivity Repeatability antibacterial agent

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antibacterial activity of Polygonum orientale extracts against Clavibacter michiganensis subsp.michiganensis,the agent of bacterial canker of tomato disease

Antibacterial activity of Polygonum orientale extracts again...

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中国植物病理学会第十一届全国会员代表大会暨2018年学...

作者：蔡瑾 Gao Yichen Institute of Applied Chemistry Shanxi University School of Life Science Shanxi University

Clavibacter michiganensis subsp.michiganensis(Cmm),which is a Gram positive bacterium,causes the bacterialcanker of tomato disease.Our report provided the optimum extractive conditions of antibacterial substances from Polygonum orientale against Cmm.We studied the effects of three extracting parameters,extractive time,extractive temperature,and solid to liquid ratio(g;mL),for orthogonal experiment design L(3).The analysis of variance(ANOVA) revealed that extractive time and extractive temperature had the extremely significant(Pantibacterial activity of P.orientale extracts.The optimum conditions were as follows;10 h of extractive time,60℃ of extractive temperature,and 1:20(g:mL) of solid to liquid ratio.We detected extracellular ODvalue,extracellular protein content,and conformational structure of membrane protein to evaluate the integrity of cell membrane.We detected extracellular alkaline phosphatase(AKP) activity to evaluate the integrity of cell wall.Results indicated that the cell membrane and cell wall of Cmm were seriously damaged by P.orientale extracts.Furthermore,we demonstrated that P.orientale extracts reduced the intracellular ATPase activity dramatically.These results suggested that P.orientale extracts had a strong antibacterial activity to inhibiting Cmm,and could be used as the control of Cmm.

关键词： Polygonum orientale extracts antibacterial agent Orthogonal experiment design antibacterial mechanism

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Contact Mechanism of the Ag-doped Trimolybdate Nanowire as An Antimicrobial agent

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Nano-Micro Letters 2012年第4期4卷 228-234页

作者： Yujie Jiang Jian Gang Sheng-Yong Xu Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics Peking University

antibacterial Ag-agents are intensively applied as broad spectrum, high-stability, high-efficiency and high-safety inorganic antibacterial agents. We have developed a new kind of antibacterial Ag-agent, namely Ag_2-x(NH_4)xMo_3O_(10) ·3H_2O nanowires(NWs). Carrying Ag atoms in the lattice and Ag-rich nanoparticles on the surface, the Ag-doped NWs show strong antibacterial effects for a variety of bacteria including E.coli, Staphylococcus aureus, Candida albicans and Aspergil lus niger. By performing systematic comparison experiments, we have proven that the main antibacterial effects are neither resulted from the tiny amount of Ag+ions released from the Ag-doped NWs in aqueous solutions, nor resulted from Ag-rich nanoparticles of fragments of the NWs when they are slowly dissolved in the Martin broth. Instead, the effects are mainly resulted from a contact mechanism, under which, the Ag-doped NWs need to be physically in contact with the bacteria to be eliminated. This is a novel phenomenon observed in the interactions between nanomaterials and live cells, which is worthy of further investigation at the molecular scale. As the Ag-doped NWs are not dissolved in pure water or weak acids, one may find practical antibacterial applications in textile industry and food storage industry for these unique nanomaterials.

关键词： antibacterial agent antibacterial Ag-agent Silver ions Silver-rich nanoparticles Silver-doped trimolybdate nanowire Bio-safety of nanomaterials Contact mechanism

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Nano zinc, an alternative to conventional zinc as animal feed supplement:A review

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Animal Nutrition 2016年第3期2卷 134-141页

作者： Partha S.Swain Somu B.N.Rao Duraisamy Rajendran George Dominic Sellappan Selvaraju ICAR National Dairy Research Institute ICAR-National Dairy Research Institute National Institute of Animal Nutrition and Physiology

The uniqueness of Zn is that, it is the second most abundant trace element in the animal body but can't be stored in the body, thus regular dietary intake is required. Zinc oxide(ZnO) nanoparticles(NP) particles are being extensively used in paints, skin lotions pigments, food, electronics appliances, biological and pharmaceutical applications and many more. Zinc oxide nanoparticles are the specially prepared mineral salt having particle size of 1 to 100 nm. It promotes growth can act as antibacterial agent,modulates the immunity and reproduction of the animals. Both in lower and higher doses of specifications it has exhibited a variety of effects on animal performances. Apart from being highly bioavailable, reports have already pointed out the growth promoting, antibacterial, immuno-modulatory and many more effects of nano zinc(nZn). These can be used at lower doses and can provide better result than the conventional Zn sources and indirectly prevents environmental contamination also. The toxicological studies provide mixed results in animal models. Studies been undertaken in diversified animal species and encouraging effects have been reported with nZn supplementation. However, there is a need to optimize the dose and duration of ZnO NP supplementation for human and livestock,depending on its biological effects. Actual bioavailability of ZnO NP in livestock is still to be worked out.In this review we have attempted to summarize, conclude the beneficial effects of nZnO and its possible usage as mineral supplement to different categories of human and livestock.

关键词： antibacterial agent Feed additive Human Livestock Nano zinc

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