ElsevierGarcia-Castello, EM.; Rodríguez López, AD.; Mayor López, L.; Ballesteros, R.; Conidi, C.; Cassano, A. (2015). Optimization of conventional and ultrasound assisted extraction of flavonoids from grapefruit (Citrus paradisi L.) when compared with conventional solvent extraction, allowing higher extraction yields 49 (on average TPC 50% and TAA 66% higher) with lower temperatures and extraction 50 times. Although the optimum process conditions indicate the use of a low ethanol 51 concentration and ultrasounds (T=25ºC, EtC=0.4 (g/g) (40 g/100 g) and t=55 min 52 leading to TPC=80.0 mg GAE/g dw and TAA=38.3 mmol trolox/g dw), it has been 53 proved that an USE treatment free of organic solvent (EtC=0 g/g), at moderate 54 temperature (25ºC) and short time (t=3 min) leads to similar results (TPC=75.3 mg 55 GAE/g dw and TAA=31.9 mmol trolox/g dw), suggesting its use for economic and 56 environmental purposes.

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