Obtaining and characterizing modified tannins by physical-chemical methods

Abstract: 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).

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch

References and Relationships

• Bibliographic citation: Obtaining and characterizing modified tannins by physical-chemical methods ; volume:12 ; number:7 ; year:2014 ; pages:757-762 ; extent:6 ; Open chemistry ; 12, Heft 7 (2014), 757-762 (gesamt 6)

Contributors, Places and Time

• Creator: Gonta, Alexandru ; Lupascu, Tudor ; Timbaliuc, Nina ; Meghea, Aurelia

Further information

• DOI: 10.2478/s11532-014-0505-7
• URN: urn:nbn:de:101:1-2410181814310.420057887748
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 15.08.2025, 7:25 AM CEST