Dissolving process of bamboo powder analyzed by FT-IR spectroscopy

Abstract Bamboo powder and its dissolution process in ionic liquids were analyzed according to Fourier Transform Infrared Spectroscopy (FT-IR) coupled with two-dimensional correlation spectroscopy and chemometrics. Second derivative spectroscopy was applied to enhance the spectra resolution, obtaining more molecular vibration information. After executing the principal component analysis (PCA) on ATR-FTIR spectra of undissolved bamboo powder residue, we obtained a three-staged dissolution process model. In addition, the conclusion that cellulose/hemicellulose dissolving prior to lignin was summarized through the PCA loading spectrum. Point-line moving window two dimensional correlation spectroscopy (PL-MW2DCOS) furtherly unveiled the dissolution details. This work provided us a clear dissolution process of biomass using a rapid, label-free and easy-operation method.