(pp.45-54) S. N. Abd El Rahman and S. Al-Mulhem ‘The preventive effect of Pomegranate peel extract as a natural antioxidant on sunflower oil oxidative rancidity’, IJFNPH, Vol. 9, No. 1, 2017

Soheir N. Abd El Rahman*
Crops Technology Research Department, Food Technology Research Institute, Agriculture Research Center, Giza, Egypt
Department of Chemistry, College of Science, University of Dammam, Saudi Arabia
Email: soheirkenawy@yahoo.com
Sara Al-Mulhem
Department of Chemistry, College of Science, University of Dammam, Saudi Arabia

ABSTRACT

Purpose: Pomegranate is a nutrient dense food rich in beneficial antioxidants. Our work was conducted to optimise the effect of pomegranate peel aqueous extract (PoP-Ax) as a natural antioxidant on sunflower oil oxidative rancidity compared to synthetic antioxidants (catachine, tannic acid and BHT).
Design and methodology: The total phenolic and antioxidant activity of PoP was determined by Folin-Ciocalteu, and 2,2- diphenyl-1-picrylhydrzyl (DPPH), respectively. High Performance Liquid Chromatograpy (HPLC) was used to investigate the major phenolic compounds and tocopherol in PoP-Ax. The pomegranate peel (PoP) antioxidant was extracted with water, ethanol, methanol and ethyl acetate.
Findings: The results showed that the antioxidant activity of PoP-Ax for diff erent intervals during the storage period was evaluated and exhibited 86.03%, 88.82%, 96.91% and 98.68% at levels 0.01%, 0.02%, 0.05% and 0.1% PoP-Ax, respectively. The peroxide value (PV) and thiobarbituric acid (TBA) at 0.05% and 0.1% of POP-Ax gave the best results compared to synthetic antioxidants.
Research implications: Our study could be recommended to use PoP-Ax as natural antioxidants at 0.05% and 0.1% for protecting oils against rancidity.
Keywords: pomegranate peel; antioxidant extract; TBA; BHT; peroxide value.

05 Soheir&Sara
05 Soheir&Sara
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