31P NMR Chemical Shifts of Solvents and Products Impurities in Biomass Pretreatments

The identification of chemical impurities is crucial in elucidating the structures of biorefinery products using nuclear magnetic resonance (NMR) spectroscopic analysis. In the current biorefinery platform, contaminants derived from pretreatment solvents and decomposition by-products may lead to misassignment of the NMR spectra of biorefinery products (e.g, lignin and bio-oils). Therefore, we investigated 54 commonly reported compounds including alcohols, carbohydrates, organic acids, aromatics, aldehydes, and ionic liquids associated with biomass pretreatment using P-31 NMR The chemical shifts of these chemicals after derivatizing with 2-chloro-4,4,5,5-tetramethyl-1,3,2-dioxaphos-pholane (TMDP) were provided. The P-31 NMR signals of these derivatives could serve as valuable and informative spectral data in characterizing lignocellulose-based compounds.