lot on the density dependence of the EoS used to describe it [@haen00; @piek06]. On the other hand, it is well known [@chom04; @inst04] that the existence of phase transitions from liquid to gas phases in asymmetric nuclear matter (ANM) is intrinsically related with the instability regions which are limited by the spinodals. Instabilities in ANM described within relativistic mean field hadron models, both with constant and density dependent couplings at zero and finite temperatures have already been investigated [@inst04] and it was shown that the main differences occur at finite temperature and large isospin asymmetry close to the boundary of the instability regions. In neutral neutron-proton-electron (npe) matter the electrons are also included. In a thermodynamical calculation the instabilities almost completely disappear due to the high electron Fermi energy [@inst062].

However, in a dynamical calculation which includes the Coulomb interaction and allows for independent neutron, proton and electron fluctuations [@inst06; @coletivos], it is seen that the electron dynamics tends to restore the short wavelength instabilities although moderated by the high electron Fermi energy.

Moreover, it is also known that the liquid-gas phase transition in ANM can lead to an isospin distillation phenomenon, characterized by a larger proton fraction in 