Progress in the Preparation of Silver Nanometer Antibacterial Material

2020 ◽  
Vol 996 ◽  
pp. 76-81
Author(s):  
Ben Jiao Li ◽  
Song Li ◽  
Bin Rong Ma ◽  
Yong Jing ◽  
Zhe Ming Zhang ◽  
...  
Keyword(s):  
Chemical Method ◽  
Antibacterial Agents ◽  
Antibacterial Properties ◽  
Physical Method ◽  
Biological Method ◽  
Preparation Methods ◽  
Antibacterial Materials ◽  
Development And Utilization ◽  
Antibacterial Material ◽  
Further Development

Silver inorganic antibacterial agents have been widely used inbiotechnology, bioengineering science, electronics, optics and water treatment because of their strong bactericidal ability, high safety and durable antibacterial properties. In this paper, the preparation methods of silver nanoparticles are reviewed, including physical method, chemical method and biological method, in order to provide a reference for the further development and utilization of silver nano-antibacterial materials.

scholarly journals Antibacterial Properties of Graphene-Based Nanomaterials

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 737 ◽  
Author(s):  
Parveen Kumar ◽  
Peipei Huo ◽  
Rongzhao Zhang ◽  
Bo Liu
Keyword(s):  
Pathogenic Bacteria ◽  
Antibacterial Agents ◽  
Antibacterial Properties ◽  
Chronic Illnesses ◽  
Antibacterial Materials ◽  
Wide Range ◽  
New Ideas ◽  
Efficient Alternative ◽  
Further Development ◽  
Toxicity Criteria

Bacteria mediated infections may cause various acute or chronic illnesses and antibiotic resistance in pathogenic bacteria has become a serious health problem around the world due to their excessive use or misuse. Replacement of existing antibacterial agents with a novel and efficient alternative is the immediate demand to alleviate this problem. Graphene-based materials have been exquisitely studied because of their remarkable bactericidal activity on a wide range of bacteria. Graphene-based materials provide advantages of easy preparation, renewable, unique catalytic properties, and exceptional physical properties such as a large specific surface area and mechanical strength. However, several queries related to the mechanism of action, significance of size and composition toward bacterial activity, toxicity criteria, and other issues are needed to be addressed. This review summarizes the recent efforts that have been made so far toward the development of graphene-based antibacterial materials to face current challenges to combat against the bacterial targets. This review describes the inherent antibacterial activity of graphene-family and recent advances that have been made on graphene-based antibacterial materials covering the functionalization with silver nanoparticles, other metal ions/oxides nanoparticles, polymers, antibiotics, and enzymes along with their multicomponent functionalization. Furthermore, the review describes the biosafety of the graphene-based antibacterial materials. It is hoped that this review will provide valuable current insight and excite new ideas for the further development of safe and efficient graphene-based antibacterial materials.

Preparation and Structure Analysis of Noncrystalline Granular Starch

2010 ◽  
Vol 6 (4) ◽  
Author(s):  
Peiling Liu ◽  
Benshan Zhang ◽  
Qun Shen ◽  
Xiaosong Hu ◽  
Wenhao Li
Keyword(s):  
Thermal Treatment ◽  
Crystalline Structure ◽  
Chemical Method ◽  
Physical Method ◽  
Maize Starch ◽  
X Ray Diffraction ◽  
Preparation Methods ◽  
Peculiar Form ◽  
Freeze Dried ◽  
Better Than

Noncrystalline granular (NCG) starch is a peculiar form of starch. The granules have granular shape but no crystalline structure. It is a middle state between native semi-crystal structure and paste. The conception of NCG starch was presented and its preparation methods for native maize starch were explored. Cross-linking by chloroepoxy propane was adopted as the chemical method while ethanol treatment was adopted as the physical method. Cross bonds and ethanol were both able to protect starch granules from swelling while thermal treatment was able to destroy crystalline structure of the granules. The structure of granule was observed by polarization microscope and scanning electron microscopy (SEM). Change from crystalline to noncrystalline structure was confirmed by X-ray diffraction (XRD). It indicated that preparation of NCG starch with the physical method was better than chemical method. The detailed conditions were: maize starch (40%, w/w) was slurried in 50%-ethanol, underwent thermal treatment at 85°C for 2 minutes, washed with anhydrous ethanol (2000 ml), and freeze dried.

scholarly journals Bio-assisted synthesis of bimetallic nanoparticles featuring antibacterial and photothermal properties for the removal of biofilms

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Roman Nudelman ◽  
Shira Gavriely ◽  
Darya Bychenko ◽  
Michal Barzilay ◽  
Tamilla Gulakhmedova ◽  
...  
Keyword(s):  
Bacterial Infections ◽  
Chronic Wounds ◽  
Bimetallic Nanoparticles ◽  
Antibacterial Properties ◽  
Gram Negative ◽  
Antibacterial Materials ◽  
Major Threat ◽  
Near Ir ◽  
Antibacterial Material

AbstractBiofilms are responsible for about considerable amounts of cases of bacterial infections in humans. They are considered a major threat to transplant and chronic wounds patients due to their highly resistant nature against antibacterial materials and due to the limited types of techniques that can be applied to remove them. Here we demonstrate a successful in-situ bio-assisted synthesis of dual functionality nanoparticles composed of Silver and Gold. This is done using a jellyfish-based scaffold, an antibacterial material as the templating host in the synthesis. We further explore the scaffold’s antibacterial and photothermal properties against various gram-negative and positive model bacteria with and without photo-induced heating at the Near-IR regime. We show that when the scaffold is loaded with these bimetallic nanoparticles, it exhibits dual functionality: Its photothermal capabilities help to disrupt and remove bacterial colonies and mature biofilms, and its antibacterial properties prevent the regrowth of new biofilms. Graphical Abstract

New Preparation Method and Characterization of Nanosilver

2014 ◽  
Vol 809-810 ◽  
pp. 82-87
Author(s):  
Xin Liu ◽  
Chang Ping Wei ◽  
Li Dan Dong ◽  
Sheng Nan Zhao ◽  
Jing Li ◽  
...  
Keyword(s):  
Chemical Method ◽  
Reduction Method ◽  
Preparation Method ◽  
Low Cost ◽  
Environmental Pollutants ◽  
Physical Method ◽  
Environment Protection ◽  
Preparation Methods ◽  
Microbial Enzyme

There are many kinds of preparation methods of silver nanoparticles ,such as chemical method, physical method plant reduction method and microbial enzyme and so on. The most common method is to use chemical method for reduction. But this method needs to add some chemicals that will produce environmental pollutants. The production consumption will be increased. High quality nanometer silver needing low cost and according with environment protection needs was prepared by using homogeneous precipitation that contains no auxiliary reagent and high temperature pyrolysis in this paper. Experimental results that this method is very effective.

scholarly journals From the Complex Process of Gold Ions Recovery in New Antimicrobial Product

2019 ◽  
Vol 70 (3) ◽  
pp. 1080-1084
Author(s):  
Maria Mihailescu ◽  
Petru Negrea ◽  
Narcis Duteanu ◽  
Adina Negrea ◽  
Mihaela Ciopec ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
High Resistance ◽  
Antibacterial Agents ◽  
Adsorption Process ◽  
Toxicity Tests ◽  
Antibacterial Materials ◽  
Good Antibacterial Activity ◽  
Complex Process ◽  
Domestic Use ◽  
Antibacterial Material

Production of new antibacterial materials is really important due to high resistance bacteria at classical antibiotics. In present study,using the adsorption process of gold ions loaded onto Amberlite XAD7-L-glutamic acid, antibacterial material wasproduced.The antibacterial activity of produced material was studied. In order to test this activity, frstly it was necessary to know the microbiological behaviour of Au(III), by running several toxicity tests. Synthesized material show good antibacterial activity against a broad spectrum of bacteria collected form BegaRiver. These studies were performed in order to find a new application of such materials as paints used as antibacterial agents in hospitals and for domestic use.

Fluoroquinolone-3-carboxamide Amino Acid Conjugates: Synthesis, Antibacterial Properties And Molecular Modeling Studies

2020 ◽  
Vol 17 (1) ◽  
pp. 71-84
Author(s):  
Riham M. Bokhtia ◽  
Siva S. Panda ◽  
Adel S. Girgis ◽  
Hitesh H. Honkanadavar ◽  
Tarek S. Ibrahim ◽  
...  
Keyword(s):  
Experimental Data ◽  
Antibacterial Activity ◽  
Amino Acid ◽  
Bacterial Infections ◽  
Antibacterial Agents ◽  
Antibacterial Properties ◽  
Computational Studies ◽  
Protecting Group ◽  
Amino Acid Conjugates ◽  
Molecular Modeling Studies

Background: Bacterial infections are considered as one of the major global health threats, so it is very essential to design and develop new antibacterial agents to overcome the drawbacks of existing antibacterial agents. Method: The aim of this work is to synthesize a series of new fluoroquinolone-3-carboxamide amino acid conjugates by molecular hybridization. We utilized benzotriazole chemistry to synthesize the desired hybrid conjugates. Result: All the conjugates were synthesized in good yields, characterized, evaluated for their antibacterial activity. The compounds were screened for their antibacterial activity using methods adapted from the Clinical and Laboratory Standards Institute. Synthesized conjugates were tested for activity against medically relevant pathogens; Escherichia coli (ATCC 25922), Pseudomonas aeruginosa (ATCC 27856) Staphylococcus aureus (ATCC 25923) and Enterococcus faecalis (ATCC 19433). Conclusion: The observed antibacterial experimental data indicates the selectivity of our synthesized conjugates against E.Coli. The protecting group on amino acids decreases the antibacterial activity. The synthesized conjugates are non-toxic to the normal cell lines. The experimental data were supported by computational studies.

Manufacture of the Glass Nanopore Based on Laser Heating and Experimental Research

2016 ◽  
Vol 851 ◽  
pp. 244-248
Author(s):  
Ya Fei Zhang ◽  
Zhi Yuan Yao ◽  
Bi Cheng Wu
Keyword(s):  
Laser Heating ◽  
Chemical Method ◽  
Physical Method ◽  
Experimental Basis ◽  
Generation System ◽  
Glass Capillary ◽  
Linear Ultrasonic Motor ◽  
Capillary Tension ◽  
Through Hole

The glass nanopore produced by the physical method has better physical characteristics, higher strength, stronger stability, longer life and other significant features compared with the chemical method. The purpose of this paper is to study DNA sequencing (973 project) to provide experimental basis for preparation of glass capillary 5nm 3D nanochannel In this paper, we design a set of glass capillary tension system which is controlled by laser heating and linear ultrasonic motor and produced successfully the device for the preparation of nanopore below 50 nm. In addition, the use of micro droplet generation system has carried out preliminary characterization of nanopore drawn devices. Seen from the characterization, the nanopore device fabricated can indeed produce a through-hole.

Study on the Antibacterial Performance of the Antibacterial Shutter Blades

2013 ◽  
Vol 815 ◽  
pp. 333-338
Author(s):  
Ming Li Liu ◽  
Chun Feng Li ◽  
Yun Long Wang ◽  
Kai Lu ◽  
Jiu Yin Pang ◽  
...  
Keyword(s):  
Antibacterial Agent ◽  
Antibacterial Agents ◽  
Drug Loading ◽  
Antibacterial Properties ◽  
Water Soluble ◽  
Single Factor ◽  
Antibacterial Performance ◽  
Loading Amount ◽  
Single Factor Experiment ◽  
Impregnation Solution

This study used Ag-embedded nanoTiO2, xylan and water-soluble Chitosan as antibacterial agents, respectively prepared shutter blades through the treating solution of the different concentration and the different drug loading amount of the poplar veneer. Through a single factor experiment, this paper analyzes that the different antibacterial agent, concentration of antibacterial agent and the drug loading amount have an effect on the antibacterial properties of the shutter blades. The results show that the order of antibacterial performance of the shutter blades impregnated antibacterial agents is the Ag-embedded nanoTiO2, Chitosan, Xylan. Comprehensiv-ely thought the antibacterial properties and economic index, the optimal concentration of the Ag-embedded nanoTiO2 impregnation solution is 1%.

scholarly journals A comparison of different methods to remove dissolved oxygen: Application to the electrochemical determination of imidacloprid

2015 ◽  
pp. 149-155 ◽  
Author(s):  
Ana Djurovic ◽  
Zorica Stojanovic ◽  
Snezana Kravic ◽  
Zvonimir Suturovic ◽  
Tanja Brezo ◽  
...  
Keyword(s):  
Glassy Carbon ◽  
Chemical Method ◽  
Sodium Sulfite ◽  
Physical Method ◽  
Electrochemical Determination ◽  
Carbon Electrode ◽  
Nitrogen Stream ◽  
Sulfite Ion ◽  
Sulfite Solution

This study compares different methods for the removal of oxygen from the solution prior to the chronopotentiometric determination of the insecticide imidacloprid on glassy carbon electrode. The research included the application of the chemical method involving addition of sulfite ion, and the physical method of purging the sample with nitrogen stream, as well as their combination. By comparing analytical signals of imidacloprid, chemical method showed almost the same efficiency as conventional physical method, while the best reproducibility was achieved by applying chemical method with addition of the saturated sodium sulfite solution. The method is very simple and can be applied for deoxygenation of the solution prior to the chronopotentiometric analysis. The application of the chemical deoxygenation significantly shortened duration of the chronopotentiometric analysis of imidacloprid from approximately 15 min to 1 min.

A Modified THPOH-Ammonia Treatment of Cotton to Impart Flame Retardancy and Antibacterial Properties

1977 ◽  
Vol 47 (11) ◽  
pp. 740-745 ◽  
Author(s):  
Norton A. Cashen
Keyword(s):  
Flame Retardant ◽  
Flame Retardancy ◽  
Antibacterial Agents ◽  
Antibacterial Properties ◽  
Cotton Textile ◽  
Ammonia Treatment ◽  
Textile Finishing ◽  
Undecenoic Acid

In cotton textile finishing, antibacterial agents have been chemically bended with a flame-retardant polymer for the topical control of specific bacteria such as S. epidermidis and S. aureus. Such agents might have esthetic and/or therapeutic functions. The hydrazide of 10-undecenoic acid imparted antibacterial properties to cotton when it was incorporated in the THPOH-NH2 flame-retardant finish.

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