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ANALYSIS OF ESSENTIAL OIL FROM WATERMELON SEEDS
Mansur Ahmad, Riskuwa Faruk, Kasimu Abubakar Shagari and Shehu Umar

ABSTRACT
Watermelon belongs to the family of Cucurbitaceae and it well known in Nigerian modern and traditional system for its modern and traditional uses. The present investigation was carried out to determine the chemical properties, proximate composition as well as the possible bioactive components of watermelon seeds using GCMS analysis. The oil from the seeds was extracted using soxhlet extraction procedure. Moisture was determined directly on the seeds by oven drying at 105oC for 6 hours. The yield of the dry seeds from the sample was determined. The ripened seeds and dry seeds were then ground in some blender, separately, and placed in a vacuum oven at 60oC for 6 hours and finally stored in a desiccator until analyzed. Proximate analyses were performed in triplicate in accordance with the AOAC procedures (AOAC, 1990). The ash was determined by heating overnight at 500oC and the protein content of the seeds by standard Kjeldahl (total %N) procedure. Wiss and Devine (1961) method was adopted for the chemical analysis. Free Fatty Acid of the oil (2.46?0.01%) which shows the better quality of the oil. The acid value (7.60mg/NaOH/g) fall within acceptable limits for edible oils (?10mg/NaOH/g). The GC-MS analysis was carried out on a GC-MS-QP 2010 Shimadzu system using NIST database. Seven (7) components from watermelon seeds were identified. The prevailing elements in the watermelon seeds were palmitic acid, carbonic acid, oleic acid, Dioctylester, propanedioic acid, linoleic acid chloride and delta-tocopherol. The presence of various bioactive compounds confirms the applications of watermelon for multiple ailments by traditional and modern practitioners. However, isolation of individual phytochemical constitutes may proceed to find a novel drug or lead compound.


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The Beam journal of arts and science
ISSN: 1118-5953 www.uaspolysok.edu.ng/jounal