Determination of oxygen radical absorbance capacity of black cumin (Nigella sativa) seed quinone compounds
Language English Country United States Media print
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
21425677
Knihovny.cz E-resources
- MeSH
- Antioxidants pharmacology MeSH
- Benzoquinones pharmacology MeSH
- Quinones pharmacology MeSH
- Nigella sativa chemistry MeSH
- Free Radical Scavengers pharmacology MeSH
- Seeds chemistry MeSH
- Thymol analogs & derivatives pharmacology MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Antioxidants MeSH
- Benzoquinones MeSH
- Quinones MeSH
- Free Radical Scavengers MeSH
- thymohydroquinone MeSH Browser
- Thymol MeSH
- thymoquinone MeSH Browser
In this study, the antioxidant capacities of main quinone constituents of Nigella sativa seeds, namely dithymoquinone (1), thymohydroquinone (2) and thymoquinone (3), were compared using DPPH and ORAC methods. The best scavenging activity was produced by 2, which showed a remarkable activity of 2.60 Trolox equivalents (TE) in a concentration range between 1.6 and 6.4 microg/mL and IC50 value of 2.4 microg/mL in ORAC and DPPH assays, respectively. Contrastingly, 3 possessed only weak DPPH scavenging efficacy (IC50 = 170 microg/mL) but significant antioxidative action of 1.91 TE in ORAC assay. No effect has been observed for 1. Additionally, modified protocol for synthesis of 2 has been developed with aim to enhance its availability for further studies as well as for its future potential use. Based on the results of this study, we conclude that 2 could be considered as a compound with prospective antioxidative properties.
