Observations and simulations indicate that bars are important agents to transfer material towards galaxy centers. However, observational studies devoted to investigate the effects of bars in galaxy centers are not yet conclusive. We have used a sample (Coelho & Gadotti 2011) of nearby face-on galaxies with available spectra (SDSS database) to investigate the footprints of bars in galaxy centers by analysing the central ionized gas properties of barred and unbarred galaxies separately. We find statistically significant differences in the H ss Balmer extinction, star formation rate per unit area, in the [S II]lambda 6717/[S II]lambda 6731 line ratio, and notably in the N2 parameter (N2 = log([N II]lambda 6583/H alpha)). A deeper analysis reflects that these differences are only relevant for the less massive bulges (less than or similar to 10(10) M-circle dot). These results have important consequences for studies on bulge formation and galaxy evolution.