title: Conversion of bark-rich biomass mixture into fermentable sugar by two-stage dilute acid-catalyzed hydrolysis.
abstract: Despite high availability and low cost, bark has not actively been considered as a biomass feedstock for producing bio-based products due to its high content of extractives and lignin. In this study, to investigate the feasibility of utilizing bark-rich sawmill residues for producing value-added materials, the mixed Hemlock hog fuel/pin chips (85:15 by dry weight) from a local sawmill were converted into fermentable sugar by two-stage dilute sulfuric acid-catalyzed hydrolysis. Combining the sugar yields from the first-stage (190 degrees C for 150 s with 1.1% acid) and second-stage (210 degrees C for 115 s with 2.5% acid) hydrolyses, which aimed to maximize the recovery of mannose/galactose and glucose, respectively, 13.6 g of glucose (46% theoretical maximum), 10.5 g of mannose and galactose (98% theoretical maximum), and 2.8 g of xylose (85% theoretical maximum) were obtained per 100 g of the original dry feedstock.
authors.affiliation: Division of Food Science, College of Life and Environmental Sciences, Korea University, Seoul 136-713, Republic of Korea. khekim@korea.ac.kr
authors.forename: Kyoung Heon
authors.initials: KH
authors.lastname: Kim
authors.forename: Melvin
authors.initials: M
authors.lastname: Tucker
authors.forename: Quang
authors.initials: Q
authors.lastname: Nguyen
mesh_terms: D018533:Biomass; D002241:Carbohydrates / Q000302:isolation & purification*; D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D006868:Hydrolysis; D024301:Plant Bark / Q000737:chemistry*; D013464:Sulfuric Acids / Q000737:chemistry*; D028225:Tsuga
chemical_list: D002241:Carbohydrates; D013464:Sulfuric Acids; C033158:sulfuric acid