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Original Research Article

Year: 2015 | Month: April | Volume: 2 | Issue: 4 | Pages: 148-156

An Assessment of the Phytochemicals and Antibacterial Activity of Seed Extract of Citrullus Lanatus (Watermelon)

Okon Okon Godwin1, Williams Aniebiet Udo2, Andrew Nsikak Abraham3, Atoyebi Babatunde3, Ezeh Peace Amarachukwu4, Udosen Imo Joseph3

1Department of Botany and Ecological Studies,
2Biological Science Department, University of Abuja, Abuja - Nigeria.
3Department of Microbiology, University of Uyo, Akwa Ibom - Nigeria.
4Department of Pharmaceutics and Pharmaceutical Microbiology, Ahmadu Bello University, Zaria - Nigeria.

Corresponding author: Okon Okon Godwin


Phytochemical screening and antibacterial activities of seed extract of Citrullus lanatus (watermelon) against one gram-positive organism, Staphylococcus aureus and one gram-negative organism, Escherichia coli was carried out. The seed extracts were screened for the presence of tannins, saponins, terpenoids, steroids, flavonoids, glycosides, alkaloids, amino acids and balsams. The agar well diffusion method was employed to determine the effect of the extracts on the growth of the test organisms. The results of the tests carried out on the seeds of Citrullus lanatus (watermelon) shows the phytochemical constituents of the seed extracts which showed the presence of terpenoids, tannins, balsams, flavonoids, glycosides, alkaloids and amino acids while saponins and steroids were absent. The results also showed that not all concentrations of the aqueous and ethanolic extracts of the sample had total inhibition on the growth of the tested organisms. However, the seed extracts inhibited the growth of Staphylococcus aureus and Escherichia coli at various concentrations. It was observed that for the ethanolic extract, only concentrations at 100% and 50% inhibited the growth of the test organisms and for the aqueous extract, only concentrations at 100% inhibited their growth. The results of this study show that seed extracts of C. lanatus have antibacterial activity and are potent just as standard antimicrobial drugs against gram positive and gram negative bacteria.

Keywords: Antibacterial, Citrullus lanatus, Phytochemical, Staphylococcus aureus, watermelon.

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