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Green synthesis of silver nanoparticles using glucan from mushroom and study of antibacterial activity.

Identifieur interne : 000897 ( Main/Corpus ); précédent : 000896; suivant : 000898

Green synthesis of silver nanoparticles using glucan from mushroom and study of antibacterial activity.

Auteurs : Ipsita Kumar Sen ; Amit Kumar Mandal ; Soumyananda Chakraborti ; Biswajit Dey ; Ranadhir Chakraborty ; Syed Sirajul Islam

Source :

RBID : pubmed:24076192

English descriptors

Abstract

This work demonstrates synthesis of silver nanoparticles (AgNPs) using glucan isolated from a mushroom Pleurotus florida blue variant. UV-vis spectroscopy showed maximum absorbance at 425 nm due to surface plasmon resonance of AgNPs. Average diameter of the synthesized AgNPs was 2.445 ± 1.08 nm as revealed from TEM analysis. XRD analysis confirmed the face-centered cubic (fcc) crystalline structure of metallic silver. The synthesized AgNPs-glucan conjugates exhibited antibacterial activity against multiple antibiotic resistant (MAR) bacterium Klebsiella pneumoniae YSI6A and the activity was possibly due to damage of cellular macromolecules by the generation of reactive oxygen species (ROS) which was supported by observed degradation of bacterial DNA. Decrease of bactericidal effect of AgNPs-glucan conjugates in dose-dependent manner in presence of a ROS scavenger histidine further ascertained the involvement of ROS in antibacterial activity. AgNPs-glucan conjugates at LD50 dose caused least damage (0.68% hemolysis) to human RBCs. This particular dose of AgNPs-glucan conjugates in combination with each of the four antibiotics (ampicillin, azithromycin, cefepime and tetracycline) to which K. pneumoniae YSI6A was resistant, showed synergistic effect to inhibit almost 100% bacterial growth. It thus opens an avenue to use antibiotics in combination with minimum dosages of AgNPs-glucan conjugates to control MAR bacteria.

DOI: 10.1016/j.ijbiomac.2013.09.019
PubMed: 24076192

Links to Exploration step

pubmed:24076192

Le document en format XML

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<name sortKey="Chakraborti, Soumyananda" sort="Chakraborti, Soumyananda" uniqKey="Chakraborti S" first="Soumyananda" last="Chakraborti">Soumyananda Chakraborti</name>
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<name sortKey="Chakraborty, Ranadhir" sort="Chakraborty, Ranadhir" uniqKey="Chakraborty R" first="Ranadhir" last="Chakraborty">Ranadhir Chakraborty</name>
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<term>Bacterial Load (MeSH)</term>
<term>DNA Damage (drug effects)</term>
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<term>Glucans (administration & dosage)</term>
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<term>Hemolysis (drug effects)</term>
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<div type="abstract" xml:lang="en">This work demonstrates synthesis of silver nanoparticles (AgNPs) using glucan isolated from a mushroom Pleurotus florida blue variant. UV-vis spectroscopy showed maximum absorbance at 425 nm due to surface plasmon resonance of AgNPs. Average diameter of the synthesized AgNPs was 2.445 ± 1.08 nm as revealed from TEM analysis. XRD analysis confirmed the face-centered cubic (fcc) crystalline structure of metallic silver. The synthesized AgNPs-glucan conjugates exhibited antibacterial activity against multiple antibiotic resistant (MAR) bacterium Klebsiella pneumoniae YSI6A and the activity was possibly due to damage of cellular macromolecules by the generation of reactive oxygen species (ROS) which was supported by observed degradation of bacterial DNA. Decrease of bactericidal effect of AgNPs-glucan conjugates in dose-dependent manner in presence of a ROS scavenger histidine further ascertained the involvement of ROS in antibacterial activity. AgNPs-glucan conjugates at LD50 dose caused least damage (0.68% hemolysis) to human RBCs. This particular dose of AgNPs-glucan conjugates in combination with each of the four antibiotics (ampicillin, azithromycin, cefepime and tetracycline) to which K. pneumoniae YSI6A was resistant, showed synergistic effect to inhibit almost 100% bacterial growth. It thus opens an avenue to use antibiotics in combination with minimum dosages of AgNPs-glucan conjugates to control MAR bacteria.</div>
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