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http://dx.doi.org/10.11002/kjfp.2017.24.4.529

Antioxidative capacity of hydrolyzed rapeseed cake extract and oxidative stability of fish oil-in-water emulsion added with the extract  

Lee, A-Young (Department of Food and Nutrition, Daegu University)
Lee, Jeung-Hee (Department of Food and Nutrition, Daegu University)
Publication Information
Food Science and Preservation / v.24, no.4, 2017 , pp. 529-535 More about this Journal
Abstract
Rapeseed cake was extracted with 80% ethanol and then fractionated with $H_2O$ (fraction I) as well as with 30% (II), 50% (III), 70% (IV), and 100% ethanol (V). Total phenolic content (TPC), 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity, ferric-reducing antioxidant potential, and Trolox equivalent antioxidant capacity were in the order of fractions II > III > I > IV > V. The three fractions with high antioxidant activities and TPC (I, II, and III) were pooled and hydrolyzed by NaOH solution, resulting in 18.97 mg sinapic acid/g hydrolyzed extract and 21- and 2.2-fold increases in TPC and DPPH radical scavenging activity, respectively. Hydrolyzed rapeseed cake extracts (200, 500, and 1,000 ppm) and catechin (200 ppm) as a comparison were added to 10% fish oil-in-water emulsion, and their effects on oxidative stability were investigated by measuring hydroperoxide values (PV) during refrigerated storage. PVs were significantly lower in the emulsions with added hydrolyzed extract as compared to the control (p<0.05) and significantly decreased with increasing extract concentration (p<0.05) over a period of 29 days. The emulsion added with hydrolyzed extract showed higher PV than that added catechin at the same concentration (200 ppm) during 13-22 days (p<0.05), but after then, the PV was not significantly different (p>0.05). This study indicates that hydrolyzed rapeseed cake extract rich in sinapic acid may inhibit oxidation in a fish oil-in-water emulsion in a concentration-dependent manner.
Keywords
emulsion; fish oil; oxidative stability; rapeseed cake; sinapic acid;
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Times Cited By KSCI : 2  (Citation Analysis)
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