Valorization of Citrus limon residues for the recovery of antioxidants: Evaluation and optimization of microwave and ultrasound application to solvent extraction.

Highlights: [•] Microwave and ultrasound-assisted extraction of phenolic compounds from C. limon peels were compared. [•] Response surface methodology successfully employed to optimize the extraction processes. [•] Better performance of microwave extraction than both ultrasound and conventional process. [Copyright &y& Elsevier]