Abstract
Phenolic compounds of pistachio green hull extract (PGHE) were incorporated into nanoliposomes (NLs). The NLs were prepared with different concentrations of phenolic compounds of PGHE (500, 750 and 1000 ppm) and particle size, polydispersity index (PDI), zeta potential and encapsulation efficiency (EE) were investigated. The antioxidant activity of free and incorporated phenolic compounds of PGHE were evaluated in soybean oil during 39 days of storage by measuring peroxide (PV), thiobarbituric acid (TBA) values and color. The total phenolic content and IC50 (DPPH assay) of PGHE were 614.91 ± 0.45 mg gallic acid equivalent/g fresh weight of extract and 10 ± 0.05 μg/ml extract, respectively. The prepared NLs had 101.86–105.81 nm size and PDI = 0.202–0.235. The zeta potential value of NLs varied between −47.7 and −52.3 mV. The highest EE (32.47%) was observed for NLs containing 1000 ppm of phenolic compounds. The lowest PV and TBA values were related to free phenolic compounds at 500 mg/kg oil. In comparison with free phenolic compounds, loaded NLs had lower antioxidant activity, but encapsulation could improve the stability, gradual release and solubility of phenolic compounds in soybean oil. The color of NLs containing oil samples remained constant during the storage, but free phenolic compounds changed the oil`s color. All concentrations of free and incorporated phenolic compounds had also higher antioxidant activity than BHT. Finally, 500 ppm of phenolic compounds of PGHE in its incorporated forms could be recommended as a substitute for synthetic antioxidant in soybean oil.
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This work was supported by the Research Council of Tarbiat Modares University.
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Roostaee, M., Barzegar, M., Sahari, M.A. et al. The enhancement of pistachio green hull extract functionality via nanoliposomal formulation: studying in soybean oil. J Food Sci Technol 54, 3620–3629 (2017). https://doi.org/10.1007/s13197-017-2822-2
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DOI: https://doi.org/10.1007/s13197-017-2822-2