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Abstract
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The antioxidant activity of Eryngium campestre, Froriepia subpinnata, and Mentha spicata polyphenolic extracts nanocapsulated in chitosan (CS) and maltodextrin (MD),
and incorporated in canola oil under accelerated oxidation condition was evaluated. The zeta potential of nanoemulsions coated with 10%MD, 9.5%MD:0.5%CS,
9%MD:1%CS, and 8.5%MD:1.5%CS was −7.51 to −7.68, −0.06 to −0.08, 1.20 to
1.25, and 1.85 to 1.89 mV, respectively, also the average particle size was 52.73–
52.91, 50.33–50.73, 26.05–27.29, and 15.78–15.92 nm, respectively. The highest
(>91%) and lowest (70%–75%) encapsulation efficiency of the extracts obtained for
8.5%MD:1.5%CS and 10%MD, respectively. IC50 (DPPH assay) and EC50 (FRAP assay)
of 8.5%MD:1.5%CS-treated samples were the lowest among the different formulations. The E. campestre extract nanoencapsulated with 8.5%MD:1.5%CS had the best
antioxidant capacity in canola oil, followed by 9%MD:1%CS, 9.5%MD:0.5%CS, and
10%MD. In the conclusion, the encapsulation with 8.5%MD:1.5%CS is suggested as
an efficient coating formulation to enhance the antioxidant efficacy of the extracts
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