The influence of concentration in the viscoelastic properties of an "advanced performance" xanthan gum was studied by means of both techniques, small amplitude oscillatory shear (SAOS) and large amplitude oscillatory shear (LAOS). G' and GaEuro(3), within linear viscoelastic range, were demonstrated to be higher than the ones for the conventional xanthan gum pointing out to a less fluid-like behaviour. The combination of the use of both rheological measurements revealed a regime transition within the concentration range studied. Thus, the deviations from the Cox-Merz rule for the concentrations above 0.20 % (m/m) indicate the occurrence of a more development structure. In addition, the analysis of the influence of concentration on the local shear-thickening parameter (T) obtained by LAOS confirmed the modification of the gum structure.