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Phytochemical, Minerals and Physicochemical Properties of Watermelon Seed Oil G.Rekha1, Dr

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Phytochemical, Minerals and Physicochemical Properties of Watermelon Seed Oil G.Rekha1, Dr Volume 3, Issue 2, February – 2018 International Journal of Innovative Science and Research Technology ISSN No:-2456-2165 Phytochemical, Minerals and Physicochemical Properties of Watermelon Seed Oil G.Rekha1, Dr. A. Leema Rose2 1G. Rekha, Research Scholar, Department of Chemistry, Holy Cross College, Trichy. 2Dr.A. Leema Rose, Associate Professor, Department of Chemistry, Holy Cross College, Trichy. Abstract:-Watermelon seed oil was extracted using the [6]. Watermelon fruit contained many smooth compressed solvent extraction method using n-hexane. Citrullus seeds that thickened at the margin and of black or yellow- lanatus well known fruit as watermelon of family white colour [7].Achu, et al., [8] reported high lipid level in five Cucurbitaceae. The fruit is consumed for cooling effect. Cucurbitaceae oil- seeds from different regions in Cameroon. Moreover, so many literatures suggest that it contain Oil provides concentrated energy in diet and enhanced important phytoconstituents like vitamin C, minerals etc. palatability.Njoroge G.N., Gemmill B., Bussmann R., Newton Seeds contain fatty acids and have phenolic and L.E., Ngumi V.W., (2007), Pollination ecology of Citrullus triterpinoids. The seeds extract showed so many lanatus at Yatta, Kenya. International Journal of Tropical pharmacological activities. Phytochemical screening of the Insect Science, ICIPE, 24, 73-77. seed extracts of Citrullus lanatus indicated the presence of Alkaloids, Saponins, Tannin, Phenol, Terpenoid, Amino II. MATERIAL AND METHODS acids in ethanol extracts. The physicochemical properties of the oil were determined. The following parameters are A. Oil Extraction Oil yield, Acid value, free fatty acid, saponification value, density, specific gravity, iodine, peroxide, refractive index, The Soxhlet apparatus used for solvent extraction where viscosity value. The seed oil of Watermelon showed good 300ml of n- Hexane was poured into round bottom flask.10 physicochemical properties and could be utilized grams of powdered Watermelon seed was placed in the successfully as a source of edible oil for human thimble and inserted in the centre of the extractor. The Soxhlet consumption and for industrial applications. was heated at 60oc. When the solvent was boiling, the vapor rises through the vertical tube into the condenser at the top. Keywords:-Watermelon seed oil, Solvent extraction, n-hexane, The liquid condensate drips into the filter paper thimble in the ethanol. centre, which contains the oil to be extracted. The extract seeps through the pores of the thimble and fills the siphon I. INTRODUCTION tube, where it flows back down into the round bottom flask. This was allowed to continue for 30 minutes. It was then The term “vegetable” refers to all the soft, edible removed from the tube, dried in the oven, cooled in the plant products that are usually eaten with meat, fish, or other desiccators and weighed again to determine the amount of oil savoury dish, either fresh or cooked Desai BB et al. extracted. The experiment was repeated by placing 5g of the Watermelon (Citrullus lanatus) is of the Cucurbitaceae family. Watermelon seed into the thimble. The weight of oil extracted As a member of the Cucurbitaceae, watermelon is related to was determined at 30 minutes interval. At the end of the the cantaloupe, squash and pumpkin and other plants that extraction, the resulting mixture containing the oil was grows on vines on the ground. Fruit of Citrullus lanatus L distilled off using simple distillation to recover solvent from consumed in the summer season and it gives chilling effect the oil. The oil extracted was stored in a plastic container for and reduce thirst. Watermelon plant is a spreading, hairy, further use. tendril-bearing annual vine reaching a length of several meters. Leaves are long-stalked, oblong-ovate, 8 to 20 Formula: centimeter’s long, deeply 3 to 7 lobed, with usually narrowed W1 – W2 segments. Watermelon leaves are dark green with prominent Mc = -------------- X 100 [1, 2] veins. The plant is self-fertile. Watermelon is a good W1 source of carotenoid and lycopene. Lycopene has been found to be protective against a growing list of cancer [3].Watermelon B. Photochemical Screening Test[9]: is also expectedly high in citrulline; an amino acid the body make use of to make another amino acid, arginine (used in the The phytochemical analysis of the two oil samples urea cycle to remove ammoniacal from the body) [4]. was performed to find the presence and absence of primary Watermelon is delectable, thirst-quencher which helps quench and secondary metabolites in seed oil. The plant metabolites the inflammable that contributes to conditions like asthma, such as alkaloids, phenols, sterols, terpenoids, tannins, atherosclerosis, diabetes, colon cancer and arthritis [5]. flavonoids, cardiac glycosides, and saponins were analyzed Cucurbit seeds are source of food particularly protein and oil and their test procedures were given below. IJISRT18FB228 www.ijisrt.com 966 Volume 3, Issue 2, February – 2018 International Journal of Innovative Science and Research Technology ISSN No:-2456-2165 Phenols: Few drops of oil were treating with solution of Amino acids ferric chloride. A deep bluish green precipitate indicates Few drops of oil were dissolved in a few ml of the presence of phenol. Ferric chloride solution is distilled water and 1ml of ninhydrin reagent was added to prepared by dissolving 135.2g of FeCl3.6H2O in distilled it. Development of a blue colour indicates the presence of water containing 20 ml of concentrated HCl and dilute to amino acids. 1 liter. C. Determination Of Mineral Elements: Alkaloids: Each one mL of oil was added to 1% aqueous Quantitative Analysis of Elementals [10-14] HCl over water bath and filtered. The filtrate was treated with Mayer’s reagent which is prepared by mixing 2g of Elements like nitrogen, sulphur, phosphorous, Iodine in 6g of Potassium iodide in 100 ml of distilled potassium, sodium, calcium, magnesium, zinc, copper, iron, water .Formation brown or reddish brown precipitate manganese, boron, and molybdenum were determined by indicates presence of alkaloids. following standard procedures. Ash was estimated using Gravimetric method by ASTM (1988) and the total Nitrogen Steroids: estimated by the method of Micro Kjeldhal (Bremner, 1965). One mL of oil was added to 2ml acetic anhydride Sulphur was estimated with Gravimetric method (Ali Ehyaeei, and 2ml H2SO4. Colour change from violet to blue or 1997) and the total Phosphorous by Pemberton (1927) green indicates the presence of steroids. method. Using the Flame Photometry (Systronics mid flame 127) by following the method of Stanford and English (1949) Terpenoids: the total amount of Potassium, Sodium, Calcium, and Each one mL of oil was added to 0.5ml acetic Magnesium were analysed. From the help of Atomic anhydride and few drops of concentrated H2SO4. A bluish Absorption Spectroscopy (Solar-AAS2-UK made) the total green precipitate indicates the presence of terpenoids. amount of Zinc, Copper, Iron, Manganese, Boron, Molybdenum are estimated. Tannins 1 mL of oil was boiled in 20ml water and Estimation of mineral by Atomic Absorption filtered. A few drops of 0.1% Ferric Chloride solution spectrophotometer: were added. Brownish green or blue-black colour indicates the presence of Tannins. Initially 200 ppm stock solution of the Zinc, Copper, Iron, Manganese, Boron and Molybdenum were formed by Flavonoids mixing required quantity of salts in distilled water for 5ml Ammonium solution was added to aqueous elemental analysis of seed. Perchloric-acid digestion method filtrate of each sample solution and then few drops of was used for elemental analysis (Allen, 1974) and 0.25 g of concentrated H2SO4 is added. Yellow coloration indicates seed powder was immersed in 6.5 ml of mixed acid solution the presence of Flavonoids. i.e. nitric acid, sulphuric acid and perchloricacid (5:1:0.1) and digested in a flask (50 ml) in fume hood on hot plate till the Saponins digestion was completed which was indicated by white fumes 1mL of oil was boiled with 5ml distilled water coming out from the flasks. Digested samples were allowed to and filtered. 3ml distilled water was added to the filtrate cool and transferred in 50 ml volumetric flask, by rising and shaken vigorously for 5 minutes. Persistent frothing volume with distilled water. Filtrate (Whatmann No. 42) was on warming indicates the presence of Saponins. collected and concentration of each element was determined on Solar-AAS2-(UK made) atomic absorption Glycosides spectrophotometer. Quantity of each element was calculated 5ml of H2SO4 was added to each of the test oil in by using formula: a boiling tube. The mixture was heated in boiling water for 15minutes. Fehling’s solution A and B was added and Nutrient caution in plants = (ppm in extract – blank) × A/W × the resulting mixture was heated to boiling. A brick red dilution factor precipitates indicates the presence of glycosides. A = Total volume of the oil (ml) Carbohydrates W = Weight of dry seed powder 5ml of the equal mixture of both Fehling’s solutions A and B was added to 2ml of test oil in a boiling tube, this was heated for 2 minutes. A brick red precipitates indicates a positive result. IJISRT18FB228 www.ijisrt.com 967 Volume 3, Issue 2, February – 2018 International Journal of Innovative Science and Research Technology ISSN No:-2456-2165 Estimation of mineral by Flame Photometry: and weighed was recorded. Exactly 50cm3 of the samples were recorded. The procedure was repeated with water of The estimation for sodium, calcium, Magnesium and 50cm3 of water was obtained. The specific gravity was potassium ions was carried out using Systronics med flame calculated by given formula. 127 – flame photometer. The stock solution of Sodium was Formula prepared by dissolving 2.542g sodium chloride in 1 litre of distilled water and it contains 1mg Na per ml (i.e. 1000 ppm). Weight of oil Stock solution was further diluted to give four solutions Specific gravity of oil sample = …………………………… containing 10, 5, 2.5 and 1 ppm of sodium ions.
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