FTIR spectra were obtained in ATR mode using a Nicolet iZ10 spectrometer (Thermo Scientific, Waltham, MA, USA), covering the range 600-4000 cm -1 . Each spectrum consisted of 32 scans and was recorded with a resolution of 4 cm -1 . The data were collected using OMNIC software. For presentation purposes, the obtained spectra were exported as ASCII files to OriginPro 2021 and converted to graphs.