In vitro antioxidant and antimicrobial activities of pressurized-liquid extracts of Clinopodium vulgare and Sideritis scardica

The present paper is focused on antioxidant and antimicrobial activities of pressurized-liquid extracts of Sideritis scardica and Clinopodium vulgare, wide used plants in Bulgarian traditional medicine. The pressurized-liquid technique was applied here as an easy and alternative method to obtain plant extracts. The total phenolic content was assessed and several reliable procedures were carried out to measure the antioxidant capacity of the extracts. In addition, the ability of plant extracts to enhance the oxidative stability of vegetable oils was evaluated by Rancimat test. The established antioxidant activity was in favour of the Cl. vulgare extract. Moreover, antimicrobial activity was performed toward different microorganisms. The results obtained clearly underline the potential of the investigated extracts as natural antioxidant additives to replace synthetic ones in food processing.