Characterization of dihydroxystearic acid from palm oleic acid |
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| Authors: | R Awang S Ahmad Y B Kang R Ismail |
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| Affiliation: | (1) Advanced Oleochemical Technology Centre (AOTC), Malaysian Palm Oil Board, Lot 9 & 11, Jalan P/14, Section 10, 43650 Bandar Baru Bangi, Selangor, Malaysia |
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| Abstract: | Dihydroxystearic acid (DHSA) was prepared from palm oleic acid and characterized by chromatographic and spectroscopic methods
(gas chromatography, thin-layer chromatography, Fourier transform infrared and nuclear magnetic resonance spectroscopy) as
well as wet chemistry. The crude product has a melting point of 62°C, acid value of 179, saponification value of 178, and
hydroxyl value of 196. The yield was about 90% based on unsaturation. The product obtained was found to contain DHSA, saturated
fatty acids, and unknown products. DHSA is soluble in alcohol, and its solubility decreased by increasing the alcohol chain
length. An irritancy test of DHSA indicated that purified DHSA is nonirritating. |
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| Keywords: | Dihydroxystearic acid hydroxy fatty acid irritancy oleic acid solubility |
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