  Meson-baryon couplings between positive and negative parity nucleons are
investigated using two point correlation functions in the soft meson and the
chiral limit. We find that the pi NN* coupling vanishes due to chiral symmetry,
while the eta NN* coupling remains finite. We perform an analysis based on the
algebraic method for SU(2) chiral symmetry, and find that nucleon axial charges
play an essential role for vanishing coupling constants. For an illustration,
we construct sigma models with N and N*, where we discuss their properties from
the view point of the chiral symmetry. We also discuss N and N* in the
viewpoint of chiral partner.
