Abstract
Current studies on Oenothera biennis L. have focused on seeds rather than on stalks. Thus, information on the bioactive effects of O. biennis stalks is lacking. Therefore, this study investigated the antibacterial effect of O. biennis stalk extract (OBSE) and its underlying mechanisms against Staphylococcus aureus in terms of cell permeability and respiration metabolism to effectively utilize O. biennis stalks. Results showed that OBSE inhibited S. aureus growth. The diameter of the inhibitory zone reached 13.57 mm, and the minimum inhibitory concentration was 1 mg/mL. The activity of alkaline phosphatase and the levels of electronic conductivity, nucleic acid, and protein in S. aureus suspension were remarkably decreased (p < 0.01) by OBSE treatment because of the leakage of cell contents. Furthermore, OBSE inhibited S. aureus respiration. The superposition rate of OBSE and trisodium phosphate was the lowest, and the activity of glucose-6-phosphate dehydrogenase was obviously decreased (p < 0.01) by OBSE treatment. Thus, OBSE was involved in regulating the hexose monophosphate pathway. Consequently, O. biennis stalks have a potential application in antibacterial products.
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