Journal
JOURNAL OF POLYMERS AND THE ENVIRONMENT
Volume 27, Issue 11, Pages 2428-2438Publisher
SPRINGER
DOI: 10.1007/s10924-019-01529-5
Keywords
Antimicrobial; Antioxidant; Melanin; Photocatalysis; Response surface methodology; Silver nanoparticles
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Funding
- Department of Biotechnology, Government of India, under DBT-IPLS program (IPLS) [BT/PR4572/INF/22/147/2012]
- UGC, New Delhi, India under the scheme (UGC BSR-SAP)
- IPLS program
- DBT, Government of India
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Melanin is ubiquitous in nature and has wide applications in cosmetics, agriculture, and medicine. The synthesized melanin from bacterium Aeromonas sp. SNS was further used as capping and reducing agents for synthesis of silver nanoparticles (AgNPs). The influence of the experimental parameters (AgNO3, melanin concentrations, and temperature) and their interactions on the nanoparticle synthesis was optimized using response surface methodology (RSM). The Central Composite Design (CCD) with three independent variables was optimized for the effective synthesis of AgNPs. The optimized synthesis of AgNPs was achieved at the shortest time of 14.12 h in the presence of 2.62 mM AgNO3, and 32.30 mu g ml(-1) melanin concentration at 54.86 degrees C temperature. The synthesized AgNPs were characterized by means of UV-visible spectroscopy, FTIR, SEM, TEM, and PSD respectively. The AgNPs exhibited excellent antimicrobial activity against human and food-related pathogens. These AgNPs also have strong antioxidant potential which was estimated by DPPH, DMPD and FRAP radical scavenging assays. The 92.62% photocatalytic degradation of 250 PPM brilliant green was observed in 120 min. The present finding accelerates the melanin associated AgNPs could be used in the cosmetic and pharmaceutical industries as well as in textile industries as they have superior antimicrobial, antioxidant, and photocatalytic activity.
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