Deep eutectic solvents were used for the recovery of bioactive compounds from strawberry and raspberry by-products. The best performing eutectic solvent (DES-7) was compared to one organic solvent. Total and individual phenolics, sugars, uronic acid , anthocyanins and the antioxidant activity in vitro were measured. The highest yield and purity of phenolic compounds in the extracts were obtained from strawberry extrudate with acetone (11.5%) and from raspberry extrudate (36.7%) with DES-7. The greatest yields of total sugars and acid sugars were achieved from raspberry extrudate using acetone and from strawberry extrudate using DES-7, 82.23 and 1.88 mg/g of extract, respectively. DES-7 was the solvent that extracted the most anthocyanins (1.28 mg/100 mg of extract). In addition, the extracts obtained with acetone presented the best values of antioxidant activity in vitro (DPPH value of 5.33 mmol TE/kg fresh weight and ORAC value of 37.89 μmol TE/g fresh weight) the extracts obtained with DES-7 also presented an interesting antioxidant activity , and a promising solvent for the extraction of bioactive compounds .
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Vázquez-González et al. (2020) studied this question.
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