  We present results on the disconnected contributions to three point functions
entering in studies of hadron structure. We use $N_F = 2+1+1$ twisted mass
fermions and give a detailed description on the results of the nucleon
{\sigma}-terms, isoscalar axial charge and first moments of bare parton
distributions for a range of pions masses. In addition we give the
{\sigma}-terms and the computations are performed using QUDA code implemented
on GPUs.
