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| Articolul precedent |
| Articolul urmator |
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 145 2 |
| Ultima descărcare din IBN: 2023-09-13 16:39 |
| Căutarea după subiecte similare conform CZU |
| 543.5:547.98 (1) |
| Metode fizico-chimice de analiză (altele decât metodele optice) (59) |
| Chimie organică (484) |
 SM ISO690:2012GONTA, Alexandru, LUPASCU, Tudor, TIMBALIUC, Nina, MEGHEA, Aurelia. Obtaining and characterizing modified tannins by physical-chemical methods. In: Central European Journal of Chemistry, 2014, vol. 12, pp. 757- 762. ISSN 1895-1066. DOI: https://doi.org/10.2478/s11532-014-0505-7 |
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 Central European Journal of Chemistry |
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| Volumul 12 / 2014 / ISSN 1895-1066 | ||||||
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| DOI:https://doi.org/10.2478/s11532-014-0505-7 | ||||||
| CZU: 543.5:547.98 | ||||||
| Pag. 757- 762 | ||||||
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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). [Figure not available: see fulltext.] |
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| Cuvinte-cheie antioxidant, chemiluminescence, polyphenols, tannins |
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