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Coupling constants of $\eta$ and $\eta^{\prime}$ mesons with nucleons havebeen calculated using the method of QCD sum rules. Starting fromvacuum-to-meson correlation function of interpolating fields of two nucleons,its matrix element with respect to nucleon spinors has been considered.Coupling constants at the physical points have been estimated fromextrapolation of results obtained at two other points. Anomalous glue has beenfound to give substantial contribution to the coupling constants and alsoaccounts for a significant OZI-rule violation.

Eta-nucleon and eta-prime-nucleon coupling constants in QCD and the role of gluons