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Open AccessArticle

“Green” Synthesis and Antioxidant Activity of Thermally Stable Gold Nanoparticles Encapsulated in Carbon Nanosheets

1
Department of Optometry, Asia University, Taichung 41354, Taiwan
2
Genetics Center, Department of Medical Research, China Medical University Hospital, and School of Chinese Medicine, China Medical University, Taichung 40402, Taiwan
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Department of Medical Applied Chemistry, Chung Shan Medical University, Taichung 40201, Taiwan
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Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University, Nantou 54561, Taiwan
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Department of Medical Education, Chung Shan Medical University Hospital, Taichung 40201, Taiwan
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2020, 10(7), 2272; https://doi.org/10.3390/app10072272
Received: 12 March 2020 / Revised: 23 March 2020 / Accepted: 24 March 2020 / Published: 26 March 2020
(This article belongs to the Special Issue Nano-Biophotonics in Sensing Using Nanostructures)
We have developed a “green” method for fabricating gold nanoparticles (AuNPs) through biogenic approaches. The proposed method has the advantages of facile preparation under ecofriendly conditions. AuNPs encapsulated in carbon nanosheets, and exhibiting high thermal stability, were fabricated by autoclaving pectin-capped AuNPs, which were subsequently collected through high-speed centrifugation and redispersed in aqueous solution. The 1,1-diphenyl-2-picrylhydrazy (DPPH) radical scavenging assay indicated that our prepared AuNPs exhibited more prolonged antioxidant capacity than pristine apple extracts. Electron paramagnetic resonance (EPR) spectra showed that approximately 80% of DPPH radicals were scavenged by the pectin-capped AuNPs at a concentration of 3 mg/mL. According to our results, AuNPs prepared through biogenic approaches have potential use in the food industry. View Full-Text
Keywords: green synthesis; pectin; gold nanoparticle; antioxidant; thermal stability green synthesis; pectin; gold nanoparticle; antioxidant; thermal stability
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MDPI and ACS Style

Lin, H.-W.; Wang, J.-Y.; Hsiao, V.K.S.; Chu, C.-C. “Green” Synthesis and Antioxidant Activity of Thermally Stable Gold Nanoparticles Encapsulated in Carbon Nanosheets. Appl. Sci. 2020, 10, 2272.

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