BRST symmetry and Darboux transformations in Abelian 2-form gauge theory

We analyse the constraints of an Abelian 2-form gauge theory using Faddeev-Jackiw symplectic formalism. Further, this theory is treated as a constrained system in the context of Batalin-Fradkin-Vilkovisky formalism to retrieve the BRST symmetry. Using the fields decompositions the effective action for Abelian 2-form gauge theory is written in terms of diagonalized uncanonical part and BRST exact one. The nilpotent BRST and contracting homotopy $\sigma$ closed transformations with field redefinitions are shown as the Darboux transformations used in the Faddeev-Jackiw formalism.