The aim of the ALICE experiment at the LHC is the study of
the nuclear matter under conditions of extreme energy density and temperature. Under these conditions a deconfined phase, in which quarks and gluons are no longer
confined to individual nucleons, the Quark Gluon Plasma, is predicted by Lattice-QCD. In this context the precise measurement of charged particles spectra produced in heavy ions and proton-proton collisions is a fundamental tool to study the physics of the Quark Gluon Plasma. After a brief review of ALICE identification techniques to extract particle yields, we present the identified pions, kaons and protons spectra obtained in p-p (√s = 7TeV) and Pb-Pb (√sNN = 2.76TeV) collisions
