Optimal conditions of ultrasound assisted extraction for potato peel polyphenols and the impact of this by-product on fresh cheese formulation

This work proposes the optimisation of the ultrasound assisted extraction (UAE) for total phenolic content (TPC) from potato peels (PP). The optimised extract was obtained using ethanol 20% (v/v) for 30 min at 40 8C, and it was found to be rich in total phenolics (45.03 +/- 4.16 mg GAE/g DM) and flavonoids (7.52 EQ/g DM) and exerted a good antioxidant effect with IC50s of 125.42 +/- 2.78, 87.21 +/- 7.72, and 200.77 +/- 13.38 mu g mL-1 for DPPH, phosphomolybdate, and FRAP, respectively. PP were used for the fresh cheese formulation, and this supplementation did not impact its physicochemical properties; however, the phenol content and antioxidant capacity of formulated cheeses were improved. PP-enriched fresh cheese presented a good acceptability, even better than the control.