Synthesis and characterization of chitosan–silver nanocomposite

Govindan, S.; Nivethaa, E. A. K.; Saravanan, R.; Narayanan, Vijaykrishnan; Stephen, A.

doi:10.1007/s13204-012-0109-5

Cited by 199 publications

(105 citation statements)

References 15 publications

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“…The N-H bending vibration has been observed at 1566 cm -1 and glycocidic C-O-C asymmetrical stretching appeared at 986 cm -1 . The bands related with C-N, C-O-C have been shifted toward the lower energy due to physical interaction with nano Ag [23]. Moreover, such an interaction was also depicted by peak at 809 cm -1 , which is related to nano Ag-O [24].…”

Section: Resultsmentioning

confidence: 89%

Synthesis and Characterization of Pure and Nano-Ag Impregnated Chitosan Beads and Determination of Catalytic Activities of Nano-Ag

Ahmad

Maqsood

Mehmood

et al. 2016

Bull. Chem. React. Eng. Catal.

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The synthesis of nano-Ag impregnated porous Chitosan beads, in crosslinked and uncrosslinked forms, was aimed to investigate their catalytic potential in reducing nitro group into amino by NaBH4. The material was found unique concerning the synthesis of well-defined Ag NPs and subsequently adsorbing them on its surface. The crosslinked and uncrosslinked chitosan beads were separately analyzed for the loading of Ag and its effect over the microstructures of the substrate. BET was used to explore the porous nature and pore size distributions of beads. At each stage, SEM coupled with EDX, FT-IR, and inductively coupled plasma (ICP) were employed to characterize the material. The catalytic activities of nano-Ag in crosslinked and uncrosslinked beads were determined by the reduction of 4-Nitrophenol (4-NP) into 4-aminophenol (4-AP) by NaBH4; which is least effective for such reduction. The catalytic activities were monitored by UV-Vis spectrophotometer. The results demonstrated the nano-Ag as a reliable and active catalyst which made NaBH4 quite capable for the nitro reduction. Moreover, the catalytic activities of crosslinked chitosan substrate were found more reproducible as compared to the uncrosslinked substrate.

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Section: Resultsmentioning

confidence: 89%

Synthesis and Characterization of Pure and Nano-Ag Impregnated Chitosan Beads and Determination of Catalytic Activities of Nano-Ag

Ahmad

Maqsood

Mehmood

et al. 2016

Bull. Chem. React. Eng. Catal.

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“…Numerous studies have shown antimicrobial properties of individual treatments of chitosan and silver nanoparticles [6,15,16]. Moreover, several attempts have been made to develop chitosan and Ag based nano products with higher antibacterial properties at a low concentration lower than that of individual components i.e.…”

Section: Discussionmentioning

confidence: 99%

“…Then small size AgNPs create pores on bacterial cell wall which leads to rapid disintegration of bacteria and change the cell permeability [5]. Chitosan is also used as a stabilizer instead of chemical reducing agent for protecting AgNPs from agglomeration [6]. Due to unique characteristics of chitosan Ag nano composites (CAgNCs), they have become attractive candidates as antimicrobial materials and various biomedical applications such as anticancer, wound healing and vaccine delivery agents [7].…”

Section: Introductionmentioning

confidence: 99%

Chitosan Silver Nano Composites (Cagncs) as Potential Antibacterial Agent to Control Vibrio tapetis

Shs

Gi²,

Rgpt³

et al. 2014

J Veterinar Sci Technol

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Nanocomposites exhibit high performance on antimicrobial activities and have the potential to be developed alternative antibiotics. In this study, antibacterial effects of chitosan silver nano composites (CAgNCs) were investigated using pathogenic Vibrio tapetis as a bacterial model. Agar disc diffusion and turbidimetric assay results showed that CAgNCs could inhibit the growth of V. tapetis in concentration depended manner. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of CAgNCs against V. tapetis were 50 μg/mL and 100 μg/mL, respectively. The field emission scanning electron microscopy (FE-SEM) images analysis of V. tapetis showed severe structural damage to cells after treating CAgNCs at 75 μg/mL compared to un-treated bacteria. Moreover, CAgNCs induce the intracellular ROS level, leakage of nucleic materials (RNA and DNA), decrease the cell viability and protein level in V. tapetis cells. Herein, we demonstrate that CAgNCs as effective antibacterial agent with capability to disrupt cell membrane, de-stabilize the membrane permeability, induce the oxidative stress and inhibit the expression of protein or synthesis of macromolecules. Overall results from this study suggest that mode of action of CAgNCs may be associated with excessive generation of ROS, loss in membrane integrity and inhibiting protein synthesis that cause the bacterial cell death.

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“…FT-IR spectra can reveal the specific interaction of amine group with gold nanoparticles through analysis of spectral shift [7]. In Fig 3b, curve 1 The formed gold nanoparticles in chitosan suspension possess excellent stability and the particle aggregation is less likely to occur even after several months.…”

Section: Fig 1 Comparison Of Blank Chitosan With Au Nps-chitosan Sumentioning

confidence: 99%

Preparation and Characterization of Gold Nanoparticles in Chitosan Suspension by One-Pot Chemical Reduction Method

Narayanan

Sivakumar

2014

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Abstract. Gold nanoparticles were synthesized in chitosan suspension by one-pot chemical reduction method without any chemical reducing reagent. In aqueous acidic medium, chitosan exhibits polycationic nature due to protonation of amine groups of each glucosamine repeating units. The adsorption of AuCl 4-ions occurs on chitosan through electrostatic attraction and further reduction of Au 3+ to Au 0 proceeds through a three electron transfer mechanism by oxidation of protonated amine groups of chitosan chain. The change of color from dirty yellow to intense red indicates the formation of gold nanoparticles in chitosan suspension which acts as both reducing and stabilizing agent. Characterization techniques such as UV-VIS, FTIR, Zeta potential measurement, FESEM and TEM were carried out in order to examine the reduction and stabilization phenomena rendered by chitosan.

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Synthesis and characterization of chitosan–silver nanocomposite

Cited by 199 publications

References 15 publications

Synthesis and Characterization of Pure and Nano-Ag Impregnated Chitosan Beads and Determination of Catalytic Activities of Nano-Ag

Synthesis and Characterization of Pure and Nano-Ag Impregnated Chitosan Beads and Determination of Catalytic Activities of Nano-Ag

Chitosan Silver Nano Composites (Cagncs) as Potential Antibacterial Agent to Control Vibrio tapetis

Preparation and Characterization of Gold Nanoparticles in Chitosan Suspension by One-Pot Chemical Reduction Method

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