Fig. 2

In vitro characterization of the TA gel a hydrogel formation demonstrated by inverted vital method; b the TA gel injected out from a syringe; c the morphological observation by SEM; d IR spectra of TA, CMCS and TA gel; e rheological measurement of the TA gel; f in vitro degradation of the TA gel; g in vitro release behavior of the TA; h N2a cell viability characterized by live/dead assay; i N2a cell viability measured by CCK-8