Physicochemical properties, fatty acid composition and FTIR Spectra of Gabus (Channa striata) fish oil

Abstract

This study aimed to characterize Gabus fish oil (GFO) with the scientific name of Channa striata through the determination of physicochemical properties, fatty acid composition, and FTIR spectra. Gabus fishes was obtained from Palagan (Central Java) and Bantul (Yogyakarta). Physicochemical properties of GFOs from Palagan and Bantul revealed acid values of 5.93±0.19 mg KOH/g and 2.39±0.05 mg KOH/g, saponification value of 163.39±1.96 mg KOH/g, 176.82±2.98 mg KOH/g, iodine value of 109.76±1.23 g I2/100 g, 94.21±0.16 g I2/100 g, peroxide value of 4.04±0.15 meq O2/kg and 4.03±0.59 meq O2/kg. Both oils showed significant differences in terms of physicochemical properties (P<0.05) except peroxide value having no significant difference (P>0.05). Fatty acid composition of GFO as determined by gas chromatography revealed that GFO contains a higher amount of unsaturated fatty acids such as linoleic acid and palmitoleic acid. Besides, GFO contains arachidonic acid which is act as a precursor for prostaglandin synthesis. FTIR spectrum of GFO is unique in terms of exact wavenumbers and peak intensities which supported that FTIR spectra are fingerprints that can be used for the characterization of edible fish oils.