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.