Figure 2. FT-IR spectra of CS/TCS and the appearance of TCS. The additional peaks of newly formed amide bond and peaks of thiol groups (from TGA) were observed: 1,250 cm⁻¹ (S-C bond), 1,527 cm⁻¹ (C=O double bonds of the amido bond), and 2,680 cm⁻¹ (H-S bond). Both CS and TCS had absorption band at 2923 cm⁻¹ peak corresponds to C-H bond. TCS appeared as a white, odorless fibrous structure after lyophilization.