Antioxidative, anti-inflammatory, antibacterial, and anti-adhesive activities of different solvent extracts from various parts of Basella rubra L.
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Abstract
Basella rubra is a green leafy vegetable commonly grown in a tropical region with high nutritional value. The antioxidative, anti-inflammatory, antibacterial, and anti-adhesive activities of crude extracts of B. rubra from leaves, stems, and fruits extracted with hexane, ethyl acetate (EtOAc), methanol (MeOH), and water were investigated. The results showed that MeOH extract from leaves had the highest yield of 22.62%. EtOAc extract from leaves presented the highest total phenolic contents and antioxidant activity. Furthermore, EtOAc extract from fruits exhibited the highest % nitric oxide (NO) inhibition with IC50 of 53.2 ± 3.3 µg/ml, followed by EtOAc extract from leaves with IC50 of 74.4 ± 4.3 µg/ml in LPS-activated RAW 264.7 cells. The antibacterial activity revealed that EtOAc and MeOH extracts from fruits inhibited Staphylococcus aureus DMST 8840, Salmonella typhimurium DMST 562, and Escherichia coli DMST 4212 with MIC of 3.91 mg/ml and 15.63 mg/ml, respectively. EtOAc extract from fruits was the most effective in inhibiting E. coli DMST 4212 and S. aureus DMST 8840 with adhesive inhibition of 75.8% and 55.9% to human colonic epithelial Coco-2 cells, respectively. Comparatively, MeOH extract from fruits showed 53.1% inhibition of S. typhimurium DMST 562. However, EtOAc extract from leaves was the least effective in inhibiting the adhesion of Gram-negative bacteria but moderately inhibited Gram-positive bacteria. Gas chromatography-mass spectroscopy (GC-MS) analysis revealed that EtOAc and MeOH extracts from fruits contained ergoline, sulfamide derivatives, and saturated fatty acids. The present results indicate that it might be possible to exploit EtOAc or MeOH
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