Obtaining and characterizing modified tannins by physical-chemical methods

• Authors: Alexandru Gonta , Tudor Lupascu , Nina Timbaliuc , Aurelia Meghea
• Languages of publication: EN

Abstracts

EN

After 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).

Keywords

EN

Chemiluminescence; Antioxidant; Polyphenols; Tannins; ABTS+·

• Journal: Open Chemistry
• Year: 2014
• Volume: 12
• Issue: 7
• Pages: 757-762

Dates

published

1 - 7 - 2014

online

30 - 4 - 2014

Contributors

author

Alexandru Gonta

• Academy of Sciences of Moldova,

author

Tudor Lupascu

• Academy of Sciences of Moldova

author

Nina Timbaliuc

• Academy of Sciences of Moldova

author

Aurelia Meghea

• “Politehnica” University of Bucharest

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Identifiers

DOI

10.2478/s11532-014-0505-7