Enhancement of antioxidant and antimicrobial activities of Dianthus superbus, Polygonum aviculare, Sophora flavescens, and Lygodium japonicum by pressure-assisted water extraction

Jingyu Gou, Yunyun Zou, Juhee Ahn

                                                     

Abstract

The phenol amount of Lygodium japonicum extracted by the pressure-assisted water extraction (PAWE) was noticeably increased to 12.8mg GAE/g when compared to the conventional extraction (9.3 mg GAE/g) (p<0.05). The highest antioxidant activity was observed at Polygonum aviculareextracted by the PAWE, showing the lowest EC₅₀ value of 0.09 mg/mL. The lowest minimum inhibitory concentrations (MIC₉₉) of L. japonicum extracted by the PAWE were 2.59, 3.33, and 7.37 mg/mL, respectively, against Listeria monocytogenes, Salmonella Typhimurium, andPropionibacterium acnes. These results suggest that the PAWE can be an appropriate extraction method for enhancing biological and pharmaceutical properties of medicinal plants.

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Keywords : pressure-assisted water extraction ,phenol ,flavonoid ,medicinal plant.