Manufacturing of hemicellulosic oligosaccharides from fast-growing Paulownia wood via autohydrolysis: Microwave versus conventional heating

Microwave hydrothermal treatment (MHT) is considered a sustainable technology for the valorization of lignocellulosic materials, enabling the solubilization of hemicellulosic-derived compounds, especially in the form of oligosaccharides that may present potential in the chemical, pharmaceutical or nutraceutical industries. Hence, MHT at 200 and 230 degrees C, at severity (S-0) among 2.92-4.66 were performed. S-0 = 3.98 permitted the recovery of about 80% of the initial xylan as xylooligosaccharides. In order to compare the effectiveness of MHT, conventional hydrothermal treatment (CHT) was performed at conditions leading to the maximum recovery of oligosaccharides (S-0 = 3.98, non-isothermal regime at 203 degrees C). Despite the structural features of oligomers in the three liquors were very similar, the spent solids presented different enzymatic digestibility, which implied a different effect of the treatments, reaching up to 80% of glucan to glucose conversion for the solid after MHT at 230 degrees C for 0.5 min. Additionally, CHT consumed 2.1-2.8-fold greater energy than MHT, reflecting that microwave-assisted autohydrolysis is a sustainable and efficient technology to process PW.

Automated summary

Microwave hydrothermal treatment (MHT) is a sustainable technology for the valorization of lignocellulosic materials by solubilizing hemicellulosic-derived compounds into oligosaccharides. The spent solids from MHT and conventional hydrothermal treatment (CHT) showed different enzymatic digestibility, with MHT consuming less energy than CHT.