Correlations between disintegration degree of fruit skin cells induced by ultrasound and efficiency of bio-compounds extraction.

The ultrasound (US) assisted extraction of bio-compounds from different fruit skins (apples, bananas and persimmons) was studied. The aqueous suspensions of skins were treated by US with different energy inputs (0.033-0.299 kW·h/kg) and total time of aqueous extraction was up to 2700 s. The ionic, Zi, and total polyphenol, Zp, extraction indexes of the liquid extracts were analyzed. From microscopic images the cell wall disintegration index, Zm, was determined. Increase in US energy input caused the increase of values of Zi, Zp and Zm. The correlations between extraction parameters and the disintegration index, Zm, were discussed.