Grasas y Aceites, Vol 70, No 4 (2019)

Efficiency of ultrasound assisted extract of Delonix regia petals as natural antioxidant on the oxidative stability of sunflower oil


https://doi.org/10.3989/gya.0929182

M. K.S. Morsi
Food Science Dept., Faculty of Agriculture, Cairo University, Egypt
orcid http://orcid.org/0000-0003-2061-6075

N. F.S. Morsy
Food Science Dept., Faculty of Agriculture, Cairo University, Egypt
orcid http://orcid.org/0000-0001-7648-2489

H. S. Golshany
Food Science Dept., Faculty of Agriculture, Cairo University, Egypt
orcid http://orcid.org/0000-0002-1246-5337

Abstract


The possibility of improving the oxidative stability of sunflower oil by enriching it with carotenoids from Delonix regia petals was studied. A combination of ultrasound-assisted extraction and stirring techniques was used. The optimal conditions were material/solvent ratio of 1:20 (w/v), ultrasonic power of 30 W and extraction time of 50 min. Under these conditions, the yield of total carotenoids was 503.0 μg/g dry weight. Increasing the acoustic power density degraded carotenoids. A HPLC analysis was used for the quantification of β-carotene in the extract. The DPPH radical scavenging activity and ferric reducing antioxidant power of the carotenoid-rich extract were found to be superior to the standard Butylated hydroxyl toluene (BHT). The enrichment of sunflower oil with carotenoid-rich extract at 67.46 mg carotenoids/kg oil improved its oxidative stability by more than 50% as measured by the Rancimat method. These results suggest that the investigated extract has the potential to be used as a bio-preservative in food products.

Keywords


Carotenoids; Delonix regia; Oxidative stability; Sunflower oil; Ultrasonic

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