Comparison table for reducing efficacy of different natural reducing agents.Reducing agentDuration for complete Belinostat (h)ReferencesAscorbic acid24Gao et al. (2010)Ascorbic acid24Pruna et al. (2013)l-ascorbic acid48Zhang et al., 2010Dopamine24Xu et al. (2010)Wild carrot root24Kuila et al. (2012)β-Carotene16This workFull-size tableTable optionsView in workspaceDownload as CSV
The GO suspension has yellow brownish color in deionized water. After reduction by β-carotene, the reduced GO precipitated out as black sediment. Thus, this confirms with the UV–Vis spectroscopy data that the reduction of GO by β-carotene has successfully occurred. The CRGO colloid-stable suspension in common organic solvent is vital in material manipulation and processing for practical applications. Thus, the CRGO suspension stability was tested on N-2-methyl-pyrrolidone solvent and it can be clearly observed that CRGO is colloidally stable in N-2-methyl-pyrrolidone solvent, showing no signs of precipitation even after 2 weeks ( Fig. 2a). The CRGO suspension is also compared with that of HRGO ( Fig. 2b) and there is no significant difference between both reduced samples in terms of color and colloid stability.