Abstract
A first demonstration of conjugated polyhydroxylated fullerene (C60(OH)30) on the surface of cellulose nanocrystals (CNC)s is reported. These nanohybrids display favourable antioxidant performance and are an attractive alternative to derivatized fullerene nanocages reported previously. UV–Vis measurements indicated that the C60(OH)30-CNC system scavenged 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radicals to a greater degree than C60(OH)30 alone, due to the nucleation of C60(OH)30 on the surface of CNC and high colloidal stability of the engineered nanohybrid. A mechanism for the 2-stage process of the radical reaction with C60(OH)30-CNC is proposed, and modelled by pseudo-first order kinetics. Successful grafting of C60(OH)30 on CNC was confirmed by FTIR, while TEM revealed the morphology of the system with a grafting degree of 20.8 % C60(OH)30. Zeta potential measurements of C60(OH)30-CNC in aqueous solution showed a high stability in the pH range 4.0-8.0, indicating functionality of the CNC based antioxidant system as a biocompatible and sustainable protocol with potential for use in personal care applications.
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Acknowledgments
We wish to acknowledge Celluforce Inc. for providing the cellulose nanocrystals. The research funding from CelluForce and AboraNano facilitated the research on CNCs. K. C. Tam wishes to acknowledge funding from CFI and NSERC.
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Awan, F., Bulger, E., Berry, R.M. et al. Enhanced radical scavenging activity of polyhydroxylated C60 functionalized cellulose nanocrystals. Cellulose 23, 3589–3599 (2016). https://doi.org/10.1007/s10570-016-1057-0
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DOI: https://doi.org/10.1007/s10570-016-1057-0