Extraction of antioxidant compounds from agricultural waste of pomegranate, production of lipid nanocarriers and evaluation of its antioxidant activity in delaying the oxidation of soybean oil

Articles in Press

Document Type : Research Article

Authors

1 Mashhad, Khorasan Razavi Branch, Iran

2 Department of Food Science and Technology, Azad Islamic University of Quchan, Quchan, Khorasan Razavi Branch, Iran

Abstract

In this study, extraction technology using ultrasound was used to extract the active constituents of pomegranate (Punica granatum L. variety SisheKape-Saveh). A response surface method was used to investigate the effects of the independent process variables of ultrasound exposure time and temperature on extraction yield, anthocyanin content, TPC, EC50, and FRAP. The extraction and measurement of various polyphenols from agricultural pomegranate waste is a very valuable source. Encapsulation of this compound is also an effective idea to preserve its unique properties during storage. Therefore, in this study, the extraction conditions of antioxidants from pomegranate waste were optimized and the physical properties of nanostructured lipid carrier with wall materials (glycerol distearate), emulsifier (lecithin, Tween 80) and core (pomegranate extract) were prepared and investigated. In addition, the effect of the resulting nanostructures on the oxidative stability of soybean oil was investigated by measuring the peroxide. According to the approximation of the desired functions, the optimal conditions were 39.8 min and 63.4 °C. Under these conditions, the extraction yield, anthocyanin content, TPC, EC50, and FRAP were measured to be 17.12%, 39.74 mg/L, 41.45 mg GA/mL, 5.55 mg/mL, and 2227 μmol Fe2+/L, respectively. The experimental values agreed well with the predicted values. From the results, the size of the resulting nanoparticles ranged from 82.6 to 196.7 nm. The encapsulation efficiency (EE) of nanocarriers that contained pomegranate extract ranged from 85.2-92.5 %. The highest EE was related to sample containing 5 % pomegranate extract, 4% glycerol distearate, 3% Tween 80 and 0.6% lecithin. This extract at 1000 ppm compared to BHT at 200 ppm could effectively prevent the formation of peroxides in soybean oil.

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Iranian Journal of Chemistry and Chemical Engineering

Articles in Press, Accepted Manuscript
Available Online from 27 January 2024

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