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Abstract

Seven parts of Pistacia atlantica were collected from Tlemcen in Algeria (fruits, leaves, buds, stems, roots internal and external trunk barks). Tannin content was determined and antioxidant activity of tannic extracts were measured using different assays: Total antioxidant capacity, 2,2-diphenyl-1-picrylhydrazyl (DPPH), reducing power (FRAP) and β-carotene bleaching assay The results showed that the highest tannin contents were observed in roots(49.789±0.391 mg CE/g DM) and internal trunk barks (49.095±0.306 mg CE/g DM).Tannins extracted from leaves, roots and external trunk barks showed very good DPPH radical scavenging activity (IC50 of 0.124±0.001, 0.304±0.001 and 0.440±0.001 mg/mL), ferric reducing power (0.021±0.001, 0.154±0.001 and 0.170±0.005 mg/mL) and β-carotene bleaching inhibition (0.313±0.009, 0.094±0.006 and 0.131±0.002 mg/mL), respectively. Therefore, the results suggest that this plant with all its studied parts might be considered as a potential candidate of possible health-promoting functional foods.

Correlation Analysis of Antioxidant Activities with Tannin, Total Flavonoid, and Total Phenolic Contents of Nutmeg (Myristica fragrans Houtt) Fruit Precipitated by Egg white

“…Therefore, the level of tannins should be reduced by adding flocculant substances from egg white albumin 14 . Reduced tannins can cause a decrease in antioxidant activity because tannins could be a natural source as an effective natural antioxidant compound [15][16][17][18] .…”