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Antioxidant capacities of Gundelia tournefortii L. extracts and inhibition on glutathione-S-transferase activity
Date
2007-01-01
Author
Çoruh, Nursen
Celep, A. G. Sagdicoglu
Ozgokce, F.
Iscan, M.
Metadata
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This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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Gundelia tournefortii L. is an important food source and a well-known medicinal plant in Eastern Anatolia. Therapeutic effects of medicinal plants are known to be closely related to their antioxidant capacities. Antioxidant activities of G. tournefortii, both for the aerial parts and seeds, were investigated by using both 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging and lipid peroxidation inhibition methods. The seeds were found to have higher antioxidant potential than the aerial, with IC50 values of 0.073 mg/mL for DPPH scavenging and 0.146 mg/mL for lipid peroxidation inhibition capacities. In addition, total phenolic contents of the Gundelia tournefortii L. extracts, especially the seed extracts correlates to its high antioxidant activity with 105.1 +/- 8.7 mu g gallic acid equivalents (GAEs) per mg of seed extract. Plant extracts with high phenolics content are known to have important effects on various enzymes, as well as glutathione-S-transferases, which are important detoxification enzymes in phase 11 systems with an important role in developing multi-drug resistance to chemotherapy in tumour cells. Consequently, the effects of G. tournefortii extracts on crude cytosolic glutathione-S-transferase was also studied and the seed extracts have shown effective inhibition of cytosolic GST activity, with an IC50 of 97.51 mu g/mL.
Subject Keywords
Food Science
,
Analytical Chemistry
,
General Medicine
URI
https://hdl.handle.net/11511/48906
Journal
FOOD CHEMISTRY
DOI
https://doi.org/10.1016/j.foodchem.2005.12.008
Collections
Department of Chemistry, Article