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Preparation and Physicochemical Attributes of Refined Liver Oil from Deep‐Sea Dogfish
Author(s) -
Chakraborty Kajal,
Joseph Dexy
Publication year - 2018
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1002/aocs.12055
Subject(s) - chemistry , thiobarbituric acid , phosphoric acid , food science , activated charcoal , bleach , polyunsaturated fatty acid , chromatography , refining (metallurgy) , acetic acid , biochemistry , pulp and paper industry , fatty acid , organic chemistry , adsorption , lipid peroxidation , enzyme , engineering
The liver oil of deep‐sea dogfish, Centrophorus squamosus , was extracted by different physical methods and refined by sequential processes of degumming, neutralization, decolorization, and deodorization. Phosphoric acid effectively eliminated the mucilaginous substances in crude oil to result in triglycerides with permissible contents of peroxides, unesterified fatty acids, volatile compounds, thiobarbituric acid reactive species, and total oxidation values. A synergistic combination of activated charcoal and Fuller's earth could effectively bleach the crude deep‐sea dogfish liver oil (CDLO) for greater clarity and acceptable color characteristics. The adverse odors in the crude oil were eliminated by acetic acid treatment and vacuum deodorization. This study shows that the multistep refining process of CDLO significantly enhances the composition of C 20–22 n ‐3 polyunsaturated fatty acids, with the removal of the components responsible for the undesirable physicochemical characteristics.