Abstract
Objective: To evaluate the antioxidant and antibacterial efficiency of alkaloids of root, leaf, and fruit of Cucumis trigonus.
 Methods: The antioxidant and antibacterial properties of alkaloid extracts were assessed by ferric thiocynate (FTC), 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay, hydrogen peroxide radical scavenging assay, superoxide radical scavenging activity and ferric reducing power were analyzed separately for its inhibition percentage at different concentration (20µg, 30µg, 40µg and 50µg/ml) and antibacterial activity by agar disc diffusion and minimum inhibitory concentration (MIC) against Staphylococcus aureus (MTCC Code-9886), Pseudomonas aeruginosa (MTCC Code-6458).
 Results: The highest percentage of extraction yield was observed in fruit followed by leaf and root. The maximum content of alkaloid was found in fruit and root compared to leaf. The scavenging efficiencies of the extracts increased with the increasing concentrations. Appreciable levels of total antioxidant activity by FTC (2.112±0.011%), DPPH radical scavenging activity (1.912±0.001%), superoxide radical scavenging activity (0.955±0.021%) and hydrogen peroxide radical scavenging activity (0.914±0.087 %) were observed at 50µg/ml of fruit extract. However, ferric reducing power was more in the root (0.893±0.0870%) compared to fruit (0.791±0.023%) and leaf (0.520±0.00 %) at 50µg/ml. The alkaloid extracts of root and fruit exhibited more antibacterial activity against Staphylococcus aureus (16.51±0.05 and 19.68±0.03 mm) and Pseudomonas aeruginosa (12.2±0.03 and14.2±0.06) at 100µg/ml than leaf. The minimum inhibitory concentration (MIC) of the root, leaf, and fruit was in the range of 3.125µg/ml to 35µg/ml for the pathogenic bacteria.
 Conclusion: Data from the present results revealed that the alkaloid extracts of fruit and root of C. trigonus show good antioxidant and antibacterial potential than leaf. Hence, may be explored for the formation of new antibacterial with antioxidant drugs.
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