Production Of High Quality Fish Oil: Screening For Potential Sources And Value Addition Through Physical Treatments
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Date
2011-08
Authors
Suseno, Sugeng Heri
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
The objective of this research was to improve the quality of lemuru fish oil.
Physical treatments, using both passive and active filtration, were carried out.
Testing of samples from selected fresh water fishes, marine fishes and deep sea
fishes showed that the best source of omega 3 fatty acids was Sardinella lemuru
(29.09% omega 3). Characterization of lemuru oil showed that the crude fish oil had
20% soapstock, with Peroxide Value (PV), Free Fatty Acid (FFA) content and Total
Oxidation (Totox) value of the oil being 4.40 meq/kg, 1.25 mg/kg and 40.59
meq/kg, respectively. The contents of heavy metals and toxins were negligible (not
detected). The oil colour was light-yellow. To improve the oil quality, Magnesol
XL, applied at levels ranging from 0.5-4.5%, was found to be the best adsorbent for
reducing PV, FFA, and p-Anisidine Value (p-AV). Its effects were significantly
(p<0.05) different from those of the other adsorbents (diatomaceous earth, activated
carbon and chitosan) studied. Before the adsorbent treatment, centrifugation at 2,716
x g for 60 minute was optimal for removal of FFA. Magnesol XL treatment at 1%
concentration for 10 min reduced PV by 60% and FFA by 71.2%. From the
Response Surface Methodology studies, optimal conditions for removal of primary
and secondary oxidation products were established,i.e., with Magnesol XL
concentration of 1.80%, for 5 mins. at 40.08oC. Kinetic adsorption of Magnesol XL
was best described by intra-particle diffusion (Kp1 = 189 mg/g.min0.5, Kp2 = 5.34
mg/g.min0.5) and external film mass-transfer model which yielded a ksA value of
0.0035 min-1 for Magnesol XL.
Description
Keywords
Fish Oil , Physical Treatments