Effect of energy density and citric acid concentration on anthocyanins yield and solution temperature of grape peel in microwave-assisted extraction process

► Energy density rather than microwave power level is an important factor. ► Relationship between extraction rate and energy density is a Gauss function. ► We provided mathematical models of solution temperature. ► We used citric acid + water solution as environmental-friend extraction solvent. ► We presented the sensitivity analysis of extraction rate.