INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Comparisons in the Structures and Properties of Silver Nanoparticles Synthesized by Amakusa Peels and Sodium Borohydride |
YU Jialun, XU Dan, REN Dan, XIE Dongmei, GAO Yanli
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College of Food Science, Southwest University, Chongqing 400715; |
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Abstract Two kinds of silver nanoparticles (G-AgNPs and C-AgNPs) were synthesized using the aqueous extract of Amakusa peels as the green reduction agent and NaBH4 as the chemical reduction agent, respectively. The reduction rate, particle size and morphologies, crystal structure, and chemical components of G-AgNPs and C-AgNPs were characterized, respectively, while their dispersion capability, antimicrobial activities and antioxidant activities were compared. It was found that the reduction rate of two reduction agents towards Ag+both exceeded 90%. G-AgNPs and C-AgNPs were observed to be spherical or nearly spherical crystals with face-centred cubic structure. G-AgNPs presented a narrower size distribution than C-AgNPs, and smaller average particle size and median size (D50), which were 29.81 nm and 28.21 nm, respectively. Furthermore, G-AgNPs absorbed some active components of the Amakusa peel extract on the surface, which reduced the agglomeration of AgNPs. Therefore, G-AgNPs had better dispersion capability and stability compared to C-AgNPs. Both of G-AgNPs and C-AgNPs showed strong inhibitory activities towards some food-borne gram positive bacteria (Staphylococcus aureus and Bicillus subtilis) and gram negative bacteria (Escherichia coli and Salmonella typhi). However, the antimicrobial activities of G-AgNPs were generally better than C-AgNPs. Moreover, owing to the active compounds absorbed on the surface, the decolourization rate G-AgNPs towards methylene blue (MB) was significantly higher than C-AgNPs, indicating the strong antioxidant activities of G-AgNPs. Good dispersion capability, antimicrobial activities and antioxidant activities of G-AgNPs making them ideal nano-fillers, which can be applied to fabricate functional composite mate-rials.
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Published: 22 November 2018
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