Antioxidant Activity of Some Edible Yemeni Plants Evaluated by Ferrylmyoglobin/ ABTS+ Assay

摘要

The antioxidant activity, expressed in mM Trolox equivalent antioxidant capacity (TEAC), of some edible Yemeni plants belonging to different favmilies was evaluated using the ferrylmyoglobin/ABTS+ method. Methanolic (80/100) extracts of tested plants exhibited higher (p<0.05) TEAC than extracts of other solvents. Extracts of coffee bean (Cof- fea arabica), sweet basil (Ocimum basilicum), wild thyme (Thymus serpyllum) and sorrel (Rumex acetosa) had antioxi- dant activites equivalent to 8.7-47.1 mM Trolox or 7.9-42.8 mM BHA per g dry weight of plant. The TEAC of methanolic extracts for sorrel was not significantly different (p>0.05) from extracts of Leucaena leucocephala (Thai- land) and Japanese green tea (Camellia sinensis). A good correlation (R2=0.937) was observed between TEAC and total phenol contents in 80/100 methanol extracts of tested plants.