Abstract
The present investigation analyzes the antioxidant properties of aqueous-alcoholic extracts of Bulgarian plants used in phytotherapy in relation with their polyphenol content. The total phenolic (TP) content and total antioxidant capacity (TAC) values of aqueous-alcoholic extract from Hypericum perforatum, Cydonia vulgaris, Arcostaphylos uva-ursi and Cotinus coggygria significantly exceeded the TP and TAC values of Ilex paraguariensis (mate), Aspalathus linearis (rooibos), Cyclopia intermedia (honeybush), and Camellia sinensis (black tea), famous for their antioxidants' content. The high degree of positive correlation (r=0,91) between TAC and TP values indicates the role of polyphenols for the plant antioxidant potential. Bulgarian medicinal plants are excellent sources of antioxidants established by their high TAC values as compared to the famous foreign plants honeybush, rooibos, mate and black tea and they prove to be a potential for the development of new pharmaceuticals
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