described is a closure element including a sealing element or polymer liner compound having improved barrier properties . the sealing element or compound includes a thermoplastic polymer ; and an effective absorbing amount of a cyclodextrin material . the cyclodextrin material is selected from the group comprising α - cyclodextrin , β - cyclodextrin , γ - cyclodextrin , derivatives of α - cyclodextrin , β - cyclodextrin and γ - cyclodextrin and mixtures thereof .