Extraction and Characterization of Selected Carrier Oils

Abstract

Extraction and characterization of carrier oil has been conducted experimentally on coconut, avocado and carrot oil. FTIR scan analysis was carried out on the extracted oil. Also physical and chemical properties of the carrier oils were assessed to evaluate oil quality including Specific gravity, peroxide value, saponification value, acid value and free fatty acid. The result showed all the extracted oils were liquid at room temperature an indication of the presence of oleic acid and linoleic acid and other unsaturated fatty acids. The specific gravities of 0.92, 0.91 and 0.93 for coconut, avocado and carrot oils indicate that each of the oils could be used on commercial scale. The Peroxide value recorded 0.11-0.12 meq/kg which is far below the maximum limits of 1-5 meq/kg and can last for a long time without going rancid. The low saponification values of coconut, avocado and carrot oils of 127.62 meq/kg oil, 120.12 meq/kg oil and 130.47 meq/kg oil respectively indicates that the oils could be used industrially (soap making). An iodine value of 54.63g I2/100g coconut oil, 49.21g I2/100g avocado oil and 55.01g I2/100g carrot oil obtained indicates high level of unsaturated fatty acids and can explain its liquid state on storage at room temperature. Acid values of 6.10 mg KOH/g coconut oil, 9.40 mg KOH/g avocado oil and 6.50 mg KOH/g carrot oil indicated that the oils are acceptable for industrial purposes. The % FFA values obtained as 3.10%, 4.70% and 3.30% for coconut, avocado and carrot oils respectively indicates the suitability of the oils for consumption. The FTIR scan analysis showed the various compounds present in the oils and by indication presented that coconut oil have dominant properties over that of carrot oil and should not be used as base oil for its extraction. Carboxylic acid (effective in providing antioxidant and anti-aging protection as well as improving moisture retention) and aromatic groups were found present as well as esters (excellent hydrating and softening agents). These compounds are found in all vegetable oils thereby validating their quality and explain the excellent properties of carrier oils and why they are used in conjunction with essential oils for aromatherapy purposes as well as for human consumption.