especially caffeic and chlorogenic acids, in terms
of energy input and treatment time, compared to that of PEF
(10.28−20.85 mg/g GAE DM) treatments. They justified the
higher recovery of polyphenols after HVED treatments to the
electric and mechanical disruption of Stevia leaves, thus
facilitating the extraction of soluble biomolecules.
The recovery of coloring and antioxidant pigments
(carotenoids and chlorophylls) from Stevia rebaudiana Bertoni
leaves induced by pulsed electric technologies (PEF and
HVED) at equivalent energy inputs was also investigated.21
Increase of chlorophylls a and b contents in Stevia water
extracts obtained from HVED-treated samples was observed
and compared to the control. However, they did not find
significant differences in chlorophylls a and b content in PEFtreated
Stevia samples compared to those of the control at the
same diffusion time