  Recent data on B decays involving $\eta'$ may be explained if the singlet
axial current of charmed quarks has large matrix element to $\eta'$, and
instantons were shown to be able to generate this effect. We study the
magnitude of charm contributions to nucleon polarized structure functions
generated in a similar way. Comparing the charm contribution, which is related
to a dim(6) gluonic operator, to that of light quarks, which are related by the
anomaly equation to $G\tilde G$, we found that $\Delta c/\Delta\Sigma$ =
-(0.2-0.08). Future experiments like COMPASS at CERN identifying charm
production in DIS can measure this ``intrinsic polarized charm'' component of
the nucleon.

High Energy Physics - Phenomenology