The Experts below are selected from a list of 43569 Experts worldwide ranked by ideXlab platform

Runcang Sun - One of the best experts on this subject based on the ideXlab platform.

  • preparation and Antimicrobial Property of chitosan oligosaccharide derivative rectorite nanocomposite
    Carbohydrate Polymers, 2013
    Co-Authors: Bo Liu, Xiaoying Wang, Chunsheng Pang, Jiwen Luo, Yuqiong Luo, Runcang Sun
    Abstract:

    Microwave irradiation was used to intercalate quaternized carboxymethyl chitosan oligosaccharide (QCMCO) into the layer of rectorite (REC) to prepare QCMCO/REC (QCOR) nanocomposites in 70 min, which was much faster than conventional heating method of 48 h. The structures and morphology of QCOR nanocomposites were characterized by XRD, TEM, FT-IR and zeta potential analysis, the thermal behavior and Antimicrobial activity of QCOR nanocomposites were also discussed. The results revealed that the interlayer distance of QCOR nanocomposites enlarged with the increase of QCMCO content, hydrogen bonding and electrostatic interaction between QCMCO and REC took place. As compared to QCMCO, the crystallinity of QCOR nanocomposites reduced, the thermal stability of QCOR nanocomposites improved, and the inhibitory activity of QCOR nanocomposites against microorganisms was stronger, the lowest minimum inhibition concentration was only 0.025% (w/v), the Antimicrobial mechanism was discussed via TEM and SEM micrographs.

  • cellulose silver nanocomposites microwave assisted synthesis characterization their thermal stability and Antimicrobial Property
    Carbohydrate Polymers, 2011
    Co-Authors: Ning Jia, Zhe Zhang, Qinghong Liu, Runcang Sun
    Abstract:

    A facile microwave-assisted method was developed to fabricate cellulose–silver nanocomposites by reducing silver nitrate in ethylene glycol (EG). EG acts as a solvent, a reducing reagent, and a microwave absorber in the whole system, thus no additional reductant is needed. The influences of the heating time and heating temperature on the products were investigated. The products were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), and scanning electron microscope (SEM). The thermal stability of cellulose–silver nanocomposites in nitrogen and air was studied using thermogravimetric analysis (TG) and differential scanning calorimetric analysis (DSC). Also, the cellulose–silver nanocomposites possess a high Antimicrobial activity against the model microbes Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive). It is expected that the cellulose–silver nanocomposites are a promising material for the application in the biomedical field.

Jayanthi Abraham - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis of silver nanoparticles using plants extract and analysis of their Antimicrobial Property
    Journal of Saudi Chemical Society, 2015
    Co-Authors: Peter Logeswari, Sivagnanam Silambarasan, Jayanthi Abraham
    Abstract:

    Plants extract from Ocimum tenuiflorum, Solanum tricobatum, Syzygium cumini, Centella asiatica and Citrus sinensis was used for the synthesis of silver nanoparticles (Ag NPs) from silver nitrate solution. Ag NPs were characterized by UV-vis spectrophotometer, X-ray diffractometer (XRD), atomic force microscope (AFM) and scanning electron microscope (SEM). The formation and stability of the reduced silver nanoparticles in the colloidal solution were monitored by UV-vis spectrophotometer analysis. The mean particle diameter of silver nanoparticles was calculated from the XRD pattern according to the line width of the plane, refraction peak using the Scherrer's equation. AFM showed the formation of silver nanoparticle with an average size of 28. nm, 26.5. nm, 65. nm, 22.3. nm and 28.4. nm corresponding to O. tenuiflorum, S. cumini, C. sinensis, S. tricobatum and C. asiatica, respectively. SEM determination of the brown color stable samples showed the formation of silver nanoparticles and well dispersed nanoparticles could be seen in the samples treated with silver nitrate. Antimicrobial activity of the silver bio-nanoparticles was performed by well diffusion method against Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli and Klebsiella pneumoniae. The highest Antimicrobial activity of silver nanoparticles synthesized by S. tricobatum, O. tenuiflorum extracts was found against S. aureus (30. mm) and E. coli (30. mm) respectively. The Ag NPs synthesized in this process has the efficient Antimicrobial activity against pathogenic bacteria. Of these, silver nanoparticles are playing a major role in the field of nanotechnology and nanomedicine.

  • Biosynthesis of silver and zinc oxide nanoparticles using Pichia fermentans JA2 and their Antimicrobial Property
    Applied Nanoscience, 2015
    Co-Authors: Ritika Chauhan, Arpita Reddy, Jayanthi Abraham
    Abstract:

    The development of eco-friendly alternative to chemical synthesis of metal nanoparticles is of great challenge among researchers. The present study aimed to investigate the biological synthesis, characterization, Antimicrobial study and synergistic effect of silver and zinc oxide nanoparticles against clinical pathogens using Pichia fermentans JA2. The extracellular biosynthesis of silver and zinc oxide nanoparticles was investigated using Pichia fermentans JA2 isolated from spoiled fruit pulp bought in Vellore local market. The crystalline and stable metallic nanoparticles were characterized evolving several analytical techniques including UV–visible spectrophotometer, X-ray diffraction pattern analysis and FE-scanning electron microscope with EDX-analysis. The biosynthesized metallic nanoparticles were tested for their Antimicrobial Property against medically important Gram positive, Gram negative and fungal pathogenic microorganisms. Furthermore, the biosynthesized nanoparticles were also evaluated for their increased Antimicrobial activities with various commercially available antibiotics against clinical pathogens. The biosynthesized silver nanoparticles inhibited most of the Gram negative clinical pathogens, whereas zinc oxide nanoparticles were able to inhibit only Pseudomonas aeruginosa . The combined effect of standard antibiotic disc and biosynthesized metallic nanoparticles enhanced the inhibitory effect against clinical pathogens. The biological synthesis of silver and zinc oxide nanoparticles is a novel and cost-effective approach over harmful chemical synthesis techniques. The metallic nanoparticles synthesized using Pichia fermentans JA2 possess potent inhibitory effect that offers valuable contribution to pharmaceutical associations.

Jixiao Wang - One of the best experts on this subject based on the ideXlab platform.

  • lab scale and pilot scale fabrication of amine functional reverse osmosis membrane with improved chlorine resistance and Antimicrobial Property
    Journal of Membrane Science, 2018
    Co-Authors: Yao Wang, Zhi Wang, Jixiao Wang
    Abstract:

    Abstract Enhancing membrane flux, rejection, Antimicrobial and chlorine resistance has been the focus of reverse osmosis membrane research. The permselectivity, chlorine resistance and Antimicrobial properties of a polyamide (PA) membrane were improved by immobilization of self-synthesized amine functional hydantoin derivative poly(3-allyl-5,5-dimethylhydantoin-co-vinylamine) (P(ADMH-co-VAm)). The chlorine resistance and Antimicrobial Property of the modified membrane could be regenerated due to the reversible transition between hydantoin and N-halamine. The lab-scale virgin and modified membranes were systematically characterized, and their performances were evaluated and compared with some representative commercial membranes. The modified membrane showed similar permselectivity, but higher and regenerable chlorine resistance and Antimicrobial Property as compared with the commercial membrane e.g., BW30FR. Next, a pilot-scale 0.4-m wide continuous membrane production process was performed to fabricate membrane element. The permselectivity of the modified element was also improved. During the six “chlorination-sterilization” operation cycles, the element exhibited high Antimicrobial Property with small permselectivity changes. Thus, both the lab-scale and pilot-scale testing results demonstrated the improved performances of the modified membrane.

Yao Wang - One of the best experts on this subject based on the ideXlab platform.

  • lab scale and pilot scale fabrication of amine functional reverse osmosis membrane with improved chlorine resistance and Antimicrobial Property
    Journal of Membrane Science, 2018
    Co-Authors: Yao Wang, Zhi Wang, Jixiao Wang
    Abstract:

    Abstract Enhancing membrane flux, rejection, Antimicrobial and chlorine resistance has been the focus of reverse osmosis membrane research. The permselectivity, chlorine resistance and Antimicrobial properties of a polyamide (PA) membrane were improved by immobilization of self-synthesized amine functional hydantoin derivative poly(3-allyl-5,5-dimethylhydantoin-co-vinylamine) (P(ADMH-co-VAm)). The chlorine resistance and Antimicrobial Property of the modified membrane could be regenerated due to the reversible transition between hydantoin and N-halamine. The lab-scale virgin and modified membranes were systematically characterized, and their performances were evaluated and compared with some representative commercial membranes. The modified membrane showed similar permselectivity, but higher and regenerable chlorine resistance and Antimicrobial Property as compared with the commercial membrane e.g., BW30FR. Next, a pilot-scale 0.4-m wide continuous membrane production process was performed to fabricate membrane element. The permselectivity of the modified element was also improved. During the six “chlorination-sterilization” operation cycles, the element exhibited high Antimicrobial Property with small permselectivity changes. Thus, both the lab-scale and pilot-scale testing results demonstrated the improved performances of the modified membrane.

Samera Salimpour Abkenar - One of the best experts on this subject based on the ideXlab platform.

  • Preparation, characterization, and Antimicrobial Property of cotton cellulose fabric grafted with poly (propylene imine) dendrimer
    Cellulose, 2012
    Co-Authors: Samera Salimpour Abkenar, Reza Mohammad Ali Malek
    Abstract:

    Two generations of poly (propylene imine) dendrimer with amino terminated groups (G2- and G5-PPI-NH_2) were grafted on cotton cellulose fabric using cross linking agents (citric or glutaric acids). Fourier transform infrared (FTIR) spectroscopy identified ester groups which were formed between hydroxyl groups of the cotton fabric and carboxylic groups of the cross linking agents. Also, attenuated total reflectance-FTIR (ATR-FTIR) analysis confirmed formation of amide groups between the carboxylic groups of the cross linking agents and the amino end groups of the dendrimers. Nitrogen content (N-content) analysis revealed the presence of the dendrimers on the cotton fabric even after 5 washing cycles. In order to study the dispersion of the PPI dendrimers on the surface of the cotton fabric, field emission scanning electron microscopy (FE-SEM) was performed. The particle size distribution of the G2- and G5-PPI-NH_2 aqueous solutions was also determined by dynamic light scattering (DLS) analysis. Antimicrobial activity of the PPI dendrimer aqueous solutions and the cotton cellulose fabric grafted with the dendrimers was evaluated both quantitatively and qualitatively against Gram-positive bacterium (Staphylococcus aureus) , Gram-negative bacteria ( Pseudomonas aeruginosa and Escherichia coli) and fungus ( Candida albicans) . The dendrimer grafted cotton cellulose fabric exhibited a 99 % reduction in bacterial counts against S. aureus, E. coli and C. albicans . The Antimicrobial activities of the grafted cotton cellulose fabric with the PPI dendrimers were maintained even after 5 washing cycles.

  • Preparation, characterization, and Antimicrobial Property of cotton cellulose fabric grafted with poly (propylene imine) dendrimer
    Cellulose, 2012
    Co-Authors: Samera Salimpour Abkenar, Reza Mohammad Ali Malek
    Abstract:

    Two generations of poly (propylene imine) dendrimer with amino terminated groups (G2- and G5-PPI-NH_2) were grafted on cotton cellulose fabric using cross linking agents (citric or glutaric acids). Fourier transform infrared (FTIR) spectroscopy identified ester groups which were formed between hydroxyl groups of the cotton fabric and carboxylic groups of the cross linking agents. Also, attenuated total reflectance-FTIR (ATR-FTIR) analysis confirmed formation of amide groups between the carboxylic groups of the cross linking agents and the amino end groups of the dendrimers. Nitrogen content (N-content) analysis revealed the presence of the dendrimers on the cotton fabric even after 5 washing cycles. In order to study the dispersion of the PPI dendrimers on the surface of the cotton fabric, field emission scanning electron microscopy (FE-SEM) was performed. The particle size distribution of the G2- and G5-PPI-NH_2 aqueous solutions was also determined by dynamic light scattering (DLS) analysis. Antimicrobial activity of the PPI dendrimer aqueous solutions and the cotton cellulose fabric grafted with the dendrimers was evaluated both quantitatively and qualitatively against Gram-positive bacterium (Staphylococcus aureus) , Gram-negative bacteria ( Pseudomonas aeruginosa and Escherichia coli) and fungus ( Candida albicans) . The dendrimer grafted cotton cellulose fabric exhibited a 99 % reduction in bacterial counts against S. aureus, E. coli and C. albicans . The Antimicrobial activities of the grafted cotton cellulose fabric with the PPI dendrimers were maintained even after 5 washing cycles.