Ultrasound Assisted Alkaline Pre‐treatment Efficiently Solubilises Hemicellulose from Oat Hulls

Abstract The establishment of sustainable bioeconomies requires the utilization new renewable biomaterials. One such material currently seen as a waste product is oat hulls. Oat hulls exhibit great potential for production dietary fibres due to their exceptionally large hemicellulose content (35%). Their recalcitrant structure however suitable pre-treatment method access and process hemicellulose. After screening various physical, chemical physico-chemical methods, including autoclaving, ultrasonication, microwave-, deep eutectic solvents-, well alkaline treatments, combined ultrasonication alkali was here found be most suitable. A factorial design resulted in optimized conditions 10 min water, followed by an incubation 5 M NaOH at 80 ºC 9 h yielding solubilisation 72% all shown efficiently break ester bonds between ferulic acid main chain, contributing its solubilisation. Graphic