Some plants have antioxidant compounds and antimicrobial properties and can be used as fractional compositions in the industry. This study aimed to investigate the radical scavenging and antimicrobial properties as well as the determination of the compounds in the seed extract of Securigera securidaca. The plant seeds were extracted by maceration method using ultrasound (50 Hz) and dried extract in this study. Then, the compounds were identified by GC/MS device and the radical scavenging capacity was determined by DPPH. The antimicrobial properties of the extract were determined by disc-diffusion method against Escherichia coli, Listeria monocytogenes and Candida albicans strains. Fourteen (14) compounds were identified, containing 98.58% of total extract compositions, and the highest percentage was related to Mome Inositol (30.55%) and cis-9-Octadecenoic acid (20.44%). The highest radical scavenging capacity was observed at the concentration of 600 ppm of extract (91.6%). Different concentrations of the extract rather than the concentration of 0.25 mg/ml inhibited L. monocytogenes and all concentrations of extract had inhibitory effect on E. coli and the most effect was related to the concentration of 0.5 mg/ml (12.98 mm). None of the concentrations had an inhibitory effect on C. albicans. The results showed that the extract inhibitory effect increased on the strains effectively by increasing the concentration of extract. The plant extract can be used in the nutraceutical industries due to its appropriate antioxidant activity and antimicrobial properties.
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