Affiliation:
1. 1Academy of Sciences of Moldova
2. 2“Politehnica” University of Bucharest
Abstract
AbstractAfter oxidation of tannins (Tannins 1–3) extracted from grape seeds, Tanoxil compounds with increased solubility and enhanced antioxidant activities were synthesized. In this research, ABTS+· assay and a chemiluminescence method were used for antioxidant measurement of hydrophilic compounds (Tanoxils 1–3).It was observed that the antioxidant activity (AA, %) is very similar for the three samples, while at the same time AA is quite high (93.16%–96.48%). The percentage of inhibition by ABTS+· is higher for Tanoxil 2 (96.4%) as compared to Tannin 2 compound (14.34%). Moreover, the total content (TCF) of carboxyl and phenolic groups was investigated. TCF values, determined for Tanoxil products, revealed a double (Tanoxil 1) or triple (Tanoxil 2) increase as compared to the value of the TCF of Tannin 1. Tanoxil products represent an interest for future research as they have a high AA (96.4%) and the content of acidic groups is significant (TCF, 0.191 meq g−1).
Subject
Materials Chemistry,General Chemistry
Reference30 articles.
1. T. Tanaka, Y. Matsuo, I. Kouno. Int. J. Mol. Sci. 11, 14 (2010)
2. R. de la Iglesia, et al., International Union of Biochemistry and Molecular Biology 36(3), 159 (2010)
3. W. Bors, C. Michel, Free Radic. Biol. Med. 27, 1413 (1999)
4. C. Rice-Evans et al., Trends Plant. Sci. 2, 152 (1997)
5. S.V. Jovanavic, S. Steenken, M.G. Simic. J. Chem. Soc. Perkins Trans. 2, 2497 (1996)