  The production of charged particles has been measured in deep inelastic
scattering (DIS) with the ZEUS detector. The evolution of the moments of the
scaled momenta distributions in $Q^2$ and $x$ has been investigated in the
current fragmentation region of the Breit frame. The results in the current
region are compared to $e^+e^-$ data and QCD analytical calculations. The
results are consistent with the universality of single-particle spectra in DIS
and $e^+e^-$ annihilation at high $Q^2.$ The results at low $Q^2$ disagree with
analytical calculations based on the modified leading log approximation (MLLA)
and local parton hadron duality (LPHD).
