Journal
ENZYME AND MICROBIAL TECHNOLOGY
Volume 166, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.enzmictec.2023.110227
Keywords
Lignocellulose; Enzyme inhibition; Advanced biorefineries; Phenolics; Deactivation; Inhibition; Cellulase
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There are limited studies on the characterization of sugarcane straw for production of fermentable sugars through enzyme hydrolysis. Pretreatment of straw with liquid hot water at 180 degrees C for 50 min solubilizes hemicellulose, preserves glucan, and generates soluble phenolic compounds in the resulting liquid. Hydrothermally treated sugarcane straw has the potential to provide a valuable source of fermentable sugars for biofuel production when enzyme inhibitors are removed after pretreatment.
Relatively few studies have addressed the characterization of sugarcane straw (SCS) for production of fermentable sugars through enzyme hydrolysis. Straw is a major co-product of the sugarcane harvest in Brazil that has potential to sustainably increase cellulosic feedstocks in Brazil by 50%. Pretreatment of 10% w/v straw with liquid hot water (LHW) at 180 degrees C for 50 min (severity, So, of 4.05), solubilizes hemicellulose, preserves glucan, and generates 4.49 g/L soluble phenolic compounds in the resulting liquid. Extracts from washing pretreated solids with excess hot water followed by acetone resulted in 1.10 and 0.83 g/L phenolics, respectively. Acetone-derived extracts were more inhibitory and decreased glucose yield for enzyme hydrolysis of Solka Floc (a lignin-free cellulose) by 42%. In comparison, pretreated straw washed with hot water or acetone was readily hydrolyzed to 92% and 97% by cellulase enzyme. Hydrothermally treated SCS has the potential to provide a valuable and added source of fermentable sugars suitable for bioprocessing into biofuels and bioproducts when cellulase enzyme inhibitors are removed after pretreatment.
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