We study the role played by neutrino trapping on the hadron star (HS) to
quark star (QS) conversion mechanism proposed recently by Berezhiani and
collaborators. We find that the nucleation of quark matter drops inside hadron
matter, and therefore the conversion of a HS into a QS, is strongly inhibit by
the presence of neutrinos.Comment: 3 pages, 3 figures. Talk given at the VIII International Conference
on Strangeness in Quark Matter. Cape Town, South Africa, Septembre 200
