Oxidative stability of sunflower oils supplemented with kenaf seeds extract, roselle seeds extract and roselle extract, respectively under accelerated storage

Abstract

With the concern of adverse effects of lipid oxidation on food deterioration and human
\nhealth, the antioxidant activities of kenaf seed extracts (KSE), roselle seed extracts (RSE) and
\nroselle extracts (RE) were evaluated by comparing its oxidative stability in refined, bleached
\n& deodorised (RBD) sunflower oils with that of in synthetic antioxidant, BHA. Established
\nmethods such as peroxide values (PV), p-anisidine values (AV), TOTOX values, free fatty
\nacids (FFA), iodine values (IV), total phenolic contents (TPC), conjugated dienes (CD) and
\nconjugated triene (CT) were employed to assess the extent of oil deterioration. During 24
\ndays storage, consensus was accomplished based on the results assessed by PV, TOTOX, CD,
\nCT, IV and TPC at which the antioxidant activities of KSE, RSE and RE were better than
\nBHA. Surprisingly, the results obtained by AV and FFA assays showed the reversed. Among
\nthe extracts, RSE exhibited the best antioxidant activities. These suggest that KSE, RSE and
\nRE may be used as potential source of natural antioxidants in the application of food industry
\nto prevent lipid oxidation.