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Antibacterial Effectiveness of Rice Water (Starch)‐Capped Silver Nanoparticles Fabricated Rapidly in the Presence of Sunlight
Author(s) -
Mathew Shiji,
Raveendran Aswani,
Mathew Jyothis,
Radhakrishnan Edayileveettil K.
Publication year - 2018
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/php.13005
Subject(s) - starch , absorbance , nuclear chemistry , nanoparticle , fourier transform infrared spectroscopy , aqueous solution , silver nanoparticle , dynamic light scattering , chemistry , materials science , chemical engineering , nanotechnology , organic chemistry , chromatography , engineering
Green synthesized silver nanoparticles (Ag NP s) have enormous applications. Hence, there is an increasing demand to explore diverse bioresources for Ag NP fabrication to make the process more cost‐effective and rapid as possible. Due to the abundantly present hydroxyl groups of rice starch, it provides ideal sites for metal ion complexation and thereby synthesis of nanoparticles with promising activity. So the study was designed to develop rapid, eco‐friendly and cost‐effective method for green Ag NP synthesis using boiled rice water starch in the presence of sunlight irradiation. The starch‐capped nanoparticles ( sAgNP s) formed in the study were found to have the surface plasmon absorbance at 439 nm. The study showed optimum yield of sAgNP s when 25% rice starch was treated with aqueous 1 mM Ag NO 3 for 15 min in the presence of sunlight. Fourier transform infrared spectroscopy analysis provided mechanistic insight into the role of – OH groups of starch in the reduction of Ag NO 3 to sAgNP s. On further characterization by X‐ray diffraction analysis, the sAgNP s were identified to have FCC crystal structure. At the same time, high‐resolution transmission electron microscopic analysis showed majority of sAgNP s to have spherical morphology, and dynamic light scattering study revealed the average particle size as 36.3 nm. Further confirmation on presence of Ag NP s was carried out by energy‐dispersive X‐ray spectroscopy. Moreover, the sAgNP s exhibited promising antibacterial activity against foodborne pathogens, Salmonella Typhimurium and Staphylococcus aureus .