Journal of Food, Agriculture and Environment

Evaluation of 33 medicinal plant extracts for the antioxidant capacity and total phenols

Author(s):

Ducu-Sandu Stef ^*, Gergen Iosif, Teodor Ioan-Trasca, Lavinia Stef, Cecilia Pop, Monica Harmanescu, Ramona Biron, Elena Pet

Recieved Date: 2010-07-08, Accepted Date: 2010-11-11

Abstract:

The total phenolic content and related total antioxidant capacity of 33 medicinal plants were analyzed. The total phenols were measured by Folin-Ciocalteau assay. The total antioxidant capacity (TAC) was estimated by Ferric Reducing/Antioxidant Power (FRAP), CUPRAC and DPPH assay. The total phenolic content of medicinal plant infusions ranged from 84 to 1168 µmol Trolox/g. The results for the total antioxidant capacity ranged from 33 to 206 µmol Trolox/g for TAC_FRAP, from 29 to 515 µmol Trolox/g for TAC_CUPRAC and from 0.3 to 81.3% for DPPH. There was not very good linear correlation between total phenolic content and FRAP (R² = 0.5061). Better correlation was noticed between total phenolic content and CUPRAC (R² = 0.8828). According to their total antioxidant capacity, 33 medicinal plant samples can be divided into four groups: (1) very high total phenols (>1000 µmol Trolox/g) and TAC_FRAP (183-184 µmol Trolox/g), n = 2; (2) high total phenols ‘ (759-834 µmol Trolox/g) and TAC_FRAP (182-206 µmol Trolox/g), n = 5; (3) medium and low total phenols (635-202 µmol Trolox/g) and TAC_FRAP (82-202 µmol Trolox/g), n = 20 and (4) very low total phenols (<181 µmol Trolox/g) and TAC_FRAP (<101 µmol Trolox/ g), n=6. The highest total polyphenols, TAC_FRAP, TAC_CUPRAC and TAC_DPPH values were obtained for Epilobium montanum, followed very close by Melissae folium.

Keywords:

Antioxidants, medicinal herbs, total phenols, FRAP, CUPRAC, DPPH

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Journal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 3&4
Category: Food and Health
Pages: 207-210

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