  We consider here quark matter equation of state including strange quarks and
taking into account a nontrivial vacuum structure for QCD with gluon
condensates. The parameters of condendsate function are determined from
minimisation of the thermodynamic potential. The scale parameter of the gluon
condensates is fixed from the SVZ parameter in the context of QCD sum rules at
zero temperature and zero baryon density. The equation of state for strange
matter at zero temperature as derived is used to study quark star structure
using Tolman Oppenheimer Volkoff equations. Stable solutions for quark stars
are obtained with a large Chandrasekhar limit as 3.2 $M_\odot$ and radii around
17 kms.
