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Comparison of microwave, ultrasound and accelerated-assisted solvent extraction for recovery of polyphenols from Citrus sinensis peels
- Nayak, Balunkeswar, Dahmoune, Farid, Moussi, Kamal, Remini, Hocine, Dairi, Sofiane, Aoun, Omar, Khodir, Madani
- Food chemistry 2015 v.187 pp. 507-516
- Citrus sinensis, acetone, antioxidant activity, citrus peels, ingredients, microwave treatment, phenolic acids, polyphenols, response surface methodology, solvents, ultrasonic treatment, value-added products
- Peel of Citrus sinensis contains significant amounts of bioactive polyphenols that could be used as ingredients for a number of value-added products with health benefits. Extraction of polyphenols from the peels was performed using a microwave-assisted extraction (MAE) technique. The effects of aqueous acetone concentration, microwave power, extraction time and solvent-to-solid ratio on the total phenolic content (TPC), total antioxidant activity (TAA) (using DPPH and ORAC-values) and individual phenolic acids (IPA) were investigated using a response surface method. The TPC, TAA and IPA of peel extracts using MAE was compared with conventional, ultrasound-assisted and accelerated solvent extraction. The maximum predicted TPC under the optimal MAE conditions (51% acetone concentration in water (v/v), 500W microwave power, 122s extraction time and 25mLg−1 solvent to solid ratio), was 12.20mgGAEg−1 DW. The TPC and TAA in MAE extracts were higher than the other three extracts.