Comparative Effects of Drying Methods on Phytochemical Contents and Anti-Microbial Activities of Watermelon (Citrullus Lanatus) Seed and Rind

Authors

  • A. D. Osinubi
  • O. O. Banjoko
  • O. H. Anselm
  • O. M. Akinrinola
  • A. Osofodunrin

Abstract

Plants and fruits are consumed for their nutritional and medicinal purposes but the effectiveness of such may be dependent on their pre-treatment method prior use. This study investigated the effect of drying methods on the phytochemical and anti-microbial properties of watermelon (Citrullus lanatus) seed and rind. The seed and rind were dried using air drying, oven drying and sun-drying methods. The methanolic extract of each sample was screened for phytochemical content (saponin, tannin, alkaloid, steroid, flavonoid, cardiac-glycoside, terpenoid, phenol and phytate). The extracts were also sreened for anti-microbial activities using six bacteria: Staphylococcus Aureus, Bacillus Cerus, Pseudomonas Aureginuss, Pseudomonas Florescence, Eshericial Coli, Salmonella Typhi and two fungi: Penicillium Oxaticum and Penicillium Chrysogenium. The result showed that all the phytochemicals were present in oven dried seed and rind. Cardiac-glycoside and flavonoid were absent in the air-dried samples while phenol and phytate were absent in the sun-dried samples. The antimicrobial screening showed the oven-dried seed and rind were more effective against all the bacteria and fungi than the sun-dried and air-dried samples. However, the sun-dried samples had more anti-bacterial and anti-fungi properties that the air-dried ones. Although oven drying is less considered as a drying method for fruits, it is recommended that watermelon (Citrullus lanatus) seed and fruit be oven-dried in order to effectively preserve its medicinal values.Keywords: Drying Method, Phytochemicals, Antimicrobials, Watermelon Seed, Watermelon Rind

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Published

2020-02-09

How to Cite

Osinubi, A. D., Banjoko, O. O., Anselm, O. H., Akinrinola, O. M., & Osofodunrin, A. (2020). Comparative Effects of Drying Methods on Phytochemical Contents and Anti-Microbial Activities of Watermelon (Citrullus Lanatus) Seed and Rind. Journal of Chemical Society of Nigeria, 45(1). Retrieved from http://journals.chemsociety.org.ng/index.php/jcsn/article/view/426