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. 2021 Jan 19;11(1):25. doi: 10.3390/bios11010025

Figure 2.

Figure 2

X-ray photoelectron spectroscopy (XPS) high-resolution spectrum of 1.5 wt% chitosan deposited on paper substrate for (a) C1s, (b) O1s and (c) N1s. (d) attenuated total internal reflection (ATR)-Fourier transform infrared (FTIR) spectra of paper modified with chitosan (sample coated twice using 1.5 wt% chitosan solution in 1% acetic acid, black trace) and chitosan functionalized with the chromogenic substrate X-Gluc (sample coated twice using 1.5 wt% chitosan solution in 1% acetic acid, red trace).