To found the specific impact of ultrasound, extracts (ultrasound
and conventional) (Fig. 13) were compared for their total phenolic
contents. Ultrasound-assisted extraction lead to a yield of gallic
acid equivalents (TPC) (121 ± 3.8 mg GAE/g DW) increased by more
than 20% than the yield obtained by conventional maceration
method (89.6 ± 2.3 mg GAE/g DW) in 30mins of extraction. The
kinetic of extraction was clearly improved, which could be
attributed to ultrasonic cavitation while it is the only variable
added between both experiments. Chemat et al. showed, by-using
electronic microscopy, physical effects of ultrasound on cells when
applied on plant material [