Influence of different amino acid groups on the free radical scavenging capability of multi walled carbon nanotubes
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Updated: May 15, 2026

Facile Preparation of Internally Self-assembled Lipid Particles Stabilized by Carbon Nanotubes
Published on: February 19, 2016
Ahmad Amiri1, Mina Memarpoor-Yazdi, Mehdi Shanbedi
1Department of Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran. Ahm.Amiri@gmail.com
Abstract:
Multi-walled carbon nanotubes (MWCNTs) were functionalized with a series of amino acids (lysine, arginine, cysteine, histidine, and aspartic acid) by sonication. Surface functional groups of the treated MWCNTs were investigated by infrared spectroscopy, Raman spectroscopy and thermogravimetric analysis. The results indicated the formation of various amino acid functionalities on the MWCNT surface, as well as the improved dispersion of MWCNTs in water. After functionalization, the antioxidant activity of all treated samples was analyzed using 2,2-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS), 1,1-diphenyl-2-picrylhydrazyl (DPPH), and hydroxyl radical scavenging, metal ion chelating, and reducing power assays. The antioxidant activity of the functionalized MWCNTs was 2-2.5 times greater than that of reduced glutathione (GSH) in ABTS radical scavenging, 1.5-5 times greater than that of GSH in reducing power, 1.3-1.8 times greater than that of butylated hydroxyanisole (BHA) in DPPH scavenging, and 3-10 times greater than that of GSH in hydroxyl radical scavenging. Accordingly, the amino acid-functionalized MWCNTs were appeared to be more potent than BHA and GSH synthetic antioxidants, and can thus be considered as excellent antioxidants to scavenge free radicals.
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