Eicosapentaenoic Acid Enrichment from Sardine Oil by Argentation Chromatography

Chakraborty, Kajal and Devakumar, C (2007) Eicosapentaenoic Acid Enrichment from Sardine Oil by Argentation Chromatography. Journal of Agricultural and Food Chemistry, 55. pp. 7586-7595.

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Abstract

Eicosapentaenoic acid (EPA) derived from chemically hydrolyzed sardine oil was concentrated by urea fractionation using methanol at different temperatures (2, 4, and 6 °C) and urea/fatty acid ratios (2:1, 3:1, and 4:1 w/w) and purified by argentation neutral alumina column chromatography. The individual fatty acids were determined as fatty acid methyl esters (FAME) by gas-liquid chromatography and gas chromatography-mass spectroscopy as FAME and N-acyl pyrrolidides. In the mass fragmentation pattern of FAME, the base peak was assigned to be the 1-methoxyethenol moiety (m/ z) 74) obtained by McLafferty rearrangement. Formation of the cyclic tropylium ion (m/ z) 91) in fatty acids with four or more double bonds was apparent in FAME-PUFAs. The base peak of N-acyl pyrrolidides was the McLafferty rearrangement ion, 1-(pyrrolidin-1-yl)ethenol (m/ z) 113). The highest concentration of EPA (47.78%) was obtained at the crystallization temperature of 4 °C with a urea/fatty acid ratio of 4:1 (w/w) with 93.74% yield. After complexation of saturated and less unsaturated fatty acids by urea complexation, argentation chromatography resulted in an EPA of high purity (99.6%) with an overall recovery of 54.09% using 50% diethyl ether/ n-hexane as eluting solvent. The peroxide (POV) and thiobarbituric acid (TBS) values were found to be highest (4.0 mequiv of O2/kg and 5.2 mg of malondialdehyde/kg, respectively) during urea fractionation at the higher crystallization temperature (6 °C) and higher urea/fatty acid ratio (4:1).

Item Type:	Article
Uncontrolled Keywords:	Sardine oil; eicosapentaenoic acid (EPA); fatty acid methyl esters (FAME); urea fractionation; argentation column chromatography
Subjects:	Fish Biotechnology > Bioactive compound
Divisions:	CMFRI-Kochi > Marine Biotechnology, Fish Nutrition and Health Division Subject Area > CMFRI > CMFRI-Kochi > Marine Biotechnology, Fish Nutrition and Health Division CMFRI-Kochi > Marine Biotechnology, Fish Nutrition and Health Division Subject Area > CMFRI-Kochi > Marine Biotechnology, Fish Nutrition and Health Division
Depositing User:	Arun Surendran
Date Deposited:	26 Feb 2014 10:13
Last Modified:	10 Jul 2017 10:54
URI:	http://eprints.cmfri.org.in/id/eprint/9951

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