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Light-induced ZnO/Ag/rGO bactericidal photocatalyst with synergistic effect of sustained release of silver ions and enhanced reactive oxygen species

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Chinese Journal of Catalysis 2019年第5期40卷 691-702页

作者： Yunyan Wu Lili Zhang Yazhou Zhou Qinqin Liu Juan Hu Juan Yang School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 Jiangsu China Jiangsu Key laboratory for chemistry of Low-Dimensional Materials School of Chemistry and Chemical Engineering Huaiyin Normal University Huaian223300 Jiangsu China

Silver nanoparticles (Ag NPs) can effectively address the issue of antibiotic-resistant bacterial infections to reduce the potential toxicity of Ag NPs. Although challenging, it is, therefore, necessary to achieve the sustainable release of Ag+ ions from a finite amount of Ag NPs. This study aims at designing an efficient and benign antimicrobial silver-based ternary composite composed of photocatalysis zinc oxide (ZnO) and reduced graphene oxide (rGO) as a carrier, in which the reactive oxygen species (ROS) excited from ZnO and Ag+ ions released from the Ag NPs cooperate to realize an effective antibacterial activity against E. coli and S. aureus. The constant effective bacterial performance of the ternary photocatalyst with minimum Ag content can be attributed to the increase in the available quantity of ROS, which results from the enhanced separation efficiency of the photogenerated carriers. The proposed system notably realized the long-term sustainable release of Ag+ ions with low concentration for 30 days when compared with an equivalent amount of silver nitrate. Moreover, the use of the composite prevents biotoxicity and silver wastage, and imparts enhanced stability to the long-lasting antibacterial efficacy.

关键词： Zinc oxide Silver nanoparticle Reduced graphene oxide Sustained Ag+ ions release Synergistic antibacterial mechanism Reactive oxygen species

Facile Fabrication of Hyperbranched Polyacetal Quaternary Ammonium with pH-Responsive Curcumin Release for Synergistic Antibacterial Activity

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Chinese Journal of Polymer Science 2023年第4期41卷 564-573,I0008页

作者： Xing Wang Ya-Qiang Wang De-Cheng Wu Beijing National laboratory for Molecular Sciences State Key Laboratory of Polymer Physics&ChemistryInstitute of ChemistryChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China Department of Biomedical Engineering Southern University of Science and TechnologyShenzhen518055China

In the current global crisis of antibiotic resistance,persuit of an effective multi-pathway collaborative approach to enhance antibacterial activity is urgently ***,a kind of hyperbranched polyacetal quaternary ammonium(Hyper-ace-QA)with efficiently antibacterial function were synthesized by a succession of efficient click *** high molecular weights can be obtained just after UV irradiation for 3 h,and the grafting ratio can be easily adjusted through controlling solvent system,molar ratio,and *** studies indicated that Hyper-ace-QA had good biocompatibility and can be used as a potential antibacterial *** importantly,after in situ encapsulation of bioactive curcumin drugs into the hyperbranched intramolecular cavities,the acid-liable acetal linkers within the hyperbranched backbone made the loading antibacterial drugs rapidly release with pH-or bacterial-responsive behaviors since many bacteria can produce acids at the infection site by the combined actions of immune response and bacterial ***,the integration of quaternary ammonium characteristics and pH-triggered curcumin release could facilitate the antibacterial activity against gram-positive Staphylococcus *** work represents a synergistic strategy on offering important guidance to rational design of multifunctional antimicrobial vehicles,which would be promising therapeutic alternatives for first aid treatment of wound infection in critical situations.

关键词： Hyperbranched polymer Acetal Quaternary ammonium pH-Responsive Antibacterial activity

Responsive Polymeric Nanoparticles for Biofilm-infection Control

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Chinese Journal of Polymer Science 2021年第11期39卷 1376-1391页

作者： Lin-Zhu Su Yong Liu Yuan-Feng Li Ying-Li An Lin-Qi Shi State Key laboratory of Medicinal Chemical Biology Key Laboratory of Functional Polymer MaterialsMinistry of EducationInstitute of Polymer ChemistryCollege of ChemistryNankai UniversityTianjin 300071China Engineering Research Center of Clinical Functional Materials and Diagnosis&Treatment Devices of Zhejiang Province Wenzhou InstituteUniversity of Chinese Academy of SciencesOujiang LaboratoryWenzhou 325000China

With the emergence of multidrug resistance(MDR)in many pathogens,bacterial infections are becoming a growing threat to public *** frightening scenario is due largely to the formation of biofilms,in which the bacteria are extremely recalcitrant to the conventional antibiotic *** address the emergence of MDR and biofilm-associated infections,numerous polymer-based materials have been designed and prepared *** subject of this perspective is the recent development of polymer-based materials that have been applied to combat multidrug-resistant pathogens,to prevent the formation of biofilms,or enhance the eradication efficacy to mature biofilms via killing biofilm-bacteria or dispersing *** advantages and shortcomings of these polymer-based materials are discussed,as well as the challenges we are facing in the clinical translation of these systems.

关键词： Antibacterial Biofilm Multidrug resistance Polymeric nanoparticles Stimuli-responsive

Using TiO2-Biocharcoal and TiO2-Diatomite for Photodisinfection in Washing Machine Wastewater

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Journal of Geoscience and Environment Protection 2024年第8期12卷 62-79页

作者： Daphne Montesuma Ferro Paloma Otsuka Kotani Regina Affonso Nilce Ortiz chemistry and Environment Center Nuclear and Energy Research Institute IPEN So Paulo Brazil Biotechnology Center Nuclear and Energy Research Institute IPEN So Paulo Brazil

The photodisinfection process using biomolded semiconductor photocatalysts can inactivate bacteria in wastewater washing machine samples. The comparative study evaluated the photocatalyst material titanium dioxide (TiO2) synthesized with diatomite and biocharcoal biotemplate (TiO2-Biocharcoal and TiO2-Diatomite) in photodisinfection processes using domestic washing machine wastewater samples, the results of bacterial inactivation were above 96%. The efficiency of the photodisinfection process was evaluated by counting the number of colonies of the bacteria. Experiments under LED solar lamps presented similar bacterial inactivation, and a correlation with kinetic models. The kinetic study demonstrated a curved regression, indicating a better fit with the Hom model. A tail at the end of the modeling curve indicates the presence of a high concentration of inactive bacteria in the medium, while a shoulder at the beginning of the curve suggests a heterogeneous sample with a high concentration of gram-positive bacteria. The toxicity tests performed with wastewater samples without light exposure indicated low toxicity for both materials. The study presented promising disinfection results for an accessible and efficient photo-sterilization process of water contaminated with bacteria using abundant solar and renewable energy throughout the national territory. .

关键词： Photodisinfection Diatomite Biocharcoal Wastewater Titanium Dioxide

Inductance-based sensing technique for wireless,remote-query measurement in liquid media

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Science China chemistry 2010年第6期53卷 1391-1397,1460页

作者： MA Lin,NIE Zhou,HUANG Yan & YAO ShouZhou State Key laboratory of Chemo/Biosensing and Chemometrics,College of chemistry and Chemical Engineering,Hunan University,Changsha 410082,China State Key laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha China

A novel inductance-based sensing technique is presented for remote query measurement in different liquid media including organic solvents and inorganic *** inorganic solutions tested included salt solutions of different concentrations,and the organic solvents detected included 1,4-dioxane and *** extend the application of the sensor,bacterial culture media were also detected,and the growth of Escherichia coli (***) was *** influential factors which may affect the inductance responses were studied in *** was found that quantitative relationships exist between the sensor’s inductance response and the physico-chemical parameters of the liquid *** sensor’s inductance response (L) decreases with the increase of salt concentration (C) and its ionic valence (e) according to a semi-logarithmic equation LgL =-aeC + b,where a and b are constants,which is in accordance with the theoretically deduced *** inductance variation rate (ΔK) increases directly with the temperature (T): ΔK = a′ T + b′.As for organic solutions,the sensor’s inductance was found to increase with the increasing permittivity of the organic *** wireless sensor we designed is simple and easy to *** has the potential for remote determination of not only chemical substances but also microbiological species such as *** the newly developed inductance-based sensor,the pathogenic *** was monitored with a limit of detection of 10 cells/mL and a linear semi-logarithmic range of 1.0 × 101 to 2.5 × 109 cells/mL.

关键词： inductance sensor remote-query liquid medium wireless bacterial detection E. coli.

Syntheses and Crystal Structures of 3,5-Diiodo-salicylalidehyde and 3,5-Diiodo-salicylalidene-4-nitroaniline

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Chinese Journal of Structural chemistry 2009年第1期28卷 87-93页

作者：徐锁平朱广洲方瑞琴李秀玲朱海亮 School of chemistry and Chemical Engineering Xuzhou Normal University State Key laboratory of Pharmaceutical Biotechnology Nanjing University

The title compounds, C7H4I2O2 1 and C13H7I2N2O3 2, have been synthesized and characterized by single-crystal X-ray diffraction. Compound 1 crystallizes in monoclinic, space group P21/c with a = 9.802（2）, b = 13.867（3）, c = 7.364（2） A, β = 109.74（3）°, V= 942.1（3） A^3, Dc= 2.636 g/cm^3, C7H4I2O2, Mr= 373.90, F（000） = 672, μ = 6.627 mm^-1, Z = 4, R = 0.0459 and wR = 0.1018 for 1805 observed reflections （I 〉 2 σ（I））. Compound 2 belongs to the monoclinic system, space group P21/n with a = 9.015（2）, b = 12.024（2）, c = 14.072（3） A, β = 103.91（3）°, V = 1480.6（5） A^3, Dc= 2.216 g/cm^3, C13H7I2N2O3, Mr= 494.01, F（000） = 920, p = 4.255 mm^-1, Z = 4, R = 0.0777 and wR = 0.1757 for 2896 observed reflections （I 〉 2σ（I））. Compounds 1 and 2 were assayed for antibacterial activities against three Gram positive bacterial strains （B. subtilis, S. aureus and S. faecalis） and three Gram negative bacterial strains （E. coli, P. aeruginosa and E. cloacae） by MTr method. Fortunately, compound 2 is found to show potent antibacterial activity against these six bacterial strains.

关键词： 3,5-diiodosalicylalidehyde 4-nitroaniline crystal structure antibacterial activities

A highly accessible copper single-atom catalyst for wound antibacterial application

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Nano Research 2021年第12期14卷 4808-4813页

作者： Yue Zhao Yunpeng Yu Feng Gao Zhiyuan Wang Wenxing Chen Cai Chen Jia Yang Yancai Yao Junyi Du Chao Zhao Yuen Wu Department of chemistry Hefei National Laboratory for Physical Sciences at the MicroscaleCollaborative Innovation Center of Chemistry for Energy Materials(iChEM)University of Science and Technology of ChinaHefei230026China Dalian National laboratory for Clean Energy Dalian116023China Beijing Key laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing100081China College of chemistry and Chemical Engineering Southwest Petroleum UniversityChengdu610500China

bacterial infection arised from multipathogenic bacteria is a tricky issue that attracts worldwide *** this paper,a highly accessible copper single-atom catalyst(Cu SAC)supported by biocompatible N-doped mesoporous carbon nanospheres was synthesized with the emulsion-template *** tightly anchored copper single-atom of the catalyst could effectively transform O_(2) into O_(2)−•under ambient conditions by the ultra-large pore size(~23.80 nm)and small particle size(~97.71 nm).Due to multiple synergistically oxidative damages to biomolecules,the Cu SAC could be employed to eliminate different bacteria in vitro without the generation of multidrug resistance(MDR).Moreover,the Cu SAC could also promote wound healing in vivo by eradicating the propagation of bacteria at *** is envisioned that the Cu SAC with superior antibacterial performance could be applied in the treatment of related bacterial infection in future.

关键词： copper single-atom catalyst mesoporous carbon nanospheres catalytic transformation of oxygen oxidative stress bacterial infection healing

Analysis of bacterial community structures in two sewage treatment plants with different sludge properties and treatment performance by nested PCR-DGGE method

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Journal of Environmental Sciences 2007年第1期19卷 60-66页

作者： LIU Xin-chun ZHANG Yu YANG Min WANG Zhen-yu LV Wen-zhou State Key laboratory of Environmental Aquatic chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beifing 100085 China

The bacterial community structures in two sewage treatment plants with different processes and performance were investigated by denaturing gradient gel electrophoresis （DGGE） of nested polymerase chain reaction （nested PCR） amplified 16S rRNA gene fragments with group-specific primers. Samples of raw sewage and treated effluents were amplified using the whole-cell PCR method, and the activated sludge samples were amplified using the extracted genomic DNA before the PCR products were loaded on the same DGGE gel for bacterial community analysis. Ammonia-oxidizing bacterial and actinomycetic community analysis were also carried out to investigate the relationship between specific population structures and system or sludge performance. The two plants demonstrated a similarity in bacterial community structures of raw sewage and activated sludge, but they had different effluent populations. Many dominant bacterial populations of raw sewage did not appear in the activated sludge samples, suggesting that the dominant bacterial populations in raw sewage might not play an important role during wastewater treatment. Although the two plants had different sludge properties in terms of settleability and foam forming ability, they demonstrated similar actinomycetic community structures. For activated sludge with bad settling performance, the treated water presented a similar DGGE pattern with that of activated sludge, indicating the nonselective washout of bacteria from the system. The plant with better ammonium removal efficiency showed higher ammonia-oxidizing bacteria species richness. Analysis of sequencing results showed that the major populations in raw sewage were uncultured bacterium, while in activated sludge the predominant populations were beta proteobacteria.

关键词： activated sludge wastewater treatment sewage community analysis PCR-DGGE

Uptake of radioiodide by Paenibacillus sp., Pseudomonas sp.,Burkholderia sp. and Rhodococcus sp. isolated from a boreal nutrient-poor bog

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Journal of Environmental Sciences 2016年第6期28卷 26-37页

作者： Merja Lusa Jukka Lehto Hanna Aromaa Jenna Knuutinen Malin Bomberg laboratory of Radiochemistry Department of Chemistry University of Helsinki 00014 Heisinki Finland VTT Technical Research Centre of Finland 02044 Espoo Finland

Radionuclides, like radioiodine（^129I）, may escape deep geological nuclear waste repositories and migrate to the surface ecosystems. In surface ecosystems, microorganisms can affect their movement. Iodide uptake of six bacterial strains belonging to the genera Paenibacillus,Pseudomonas, Burkholderia and Rhodococcus isolated from an acidic boreal nutrient-poor bog was tested. The tests were run in four different growth media at three temperatures. All bacterial strains removed iodide from the solution with the highest efficiency shown by one of the Paenibacillus strains with 〉 99% of iodide removed from the solution in one of the used growth media. Pseudomonas, Rhodococcus and one of the two Paenibacillus strains showed highest iodide uptake in 1% yeast extract with maximum values for the distribution coefficient（Kd） ranging from 90 to 270 L/kg DW. The Burkholderia strain showed highest uptake in 1% Tryptone（maximum Kd170 L/kg DW）. The Paenibacillus strain V0-1-LW showed exceptionally high uptake in 0.5% peptone ＋ 0.25% yeast extract broth（maximum Kd〉 1,000,000 L/kg DW）. Addition of 0.1% glucose to the 0.5% peptone ＋ 0.25% yeast extract broth reduced iodide uptake at 4℃ and 20℃ and enhanced iodide uptake at 37℃ compared to the uptake without glucose. This indicates that the uptake of glucose and iodide may be competing processes in these bacteria. We estimated that in in situ conditions of the bog,the bacterial uptake of iodide accounts for approximately 0.1%–0.3% of the total sorption of iodide in the surface, subsurface peat, gyttja and clay layers.

关键词： Radioiodide Uptake Paenibacillus Pseudomonas Burkholderia Rhodococcus