Fig. 1: Schematic diagram of preparation and application of polyLA-based adhesive patch.

a Preparation process and structural characteristics of PolyLA; b Preparation process and structural characteristics of PolyLA-Na patch; c Preparation process and structural characteristics of PolyLA-Na/PolyLA binary synergistic adhesive patch; d Illustration of the proposed mechanism of PolyLA-Na/PolyLA patch for promoting oral ulcer healing. LA α-lipoic acid, LA-Na sodium α-lipoate, TNF-α tumor necrosis factor-α, IL-6 interleukin-6.