title: Enzymatic Pretreatment Coupled with the Addition of p-Hydroxyanisole Increased Levulinic Acid Production from Steam-Exploded Rice Straw Short Fiber.
abstract: Levulinic acid production, directly from lignocellulosic biomass, resulted in low yields due to the poor substrate accessibility and occurrence of side reactions. The effects of reaction conditions, enzymatic pretreatment, and inhibitor addition on the conversion of steam-exploded rice straw (SERS) short fiber to levulinic acid catalyzed by solid superacid were investigated systematically. The results indicated that the optimal reaction conditions were temperature, time, and solid superacid concentration combinations of 200 °C, 15 min, and 7.5 %. Enzymatic pretreatment improved the substrate accessibility to solid superacid catalyst, and p-hydroxyanisole inhibitor reduced the side reactions during reaction processes, which helped to increase levulinic acid yield. The levulinic acid yield reached 25.2 % under the optimal conditions, which was 61.5 % higher than that without enzymatic pretreatment and inhibitor addition. Therefore, enzymatic pretreatment coupled with the addition of p-hydroxyanisole increased levulinic acid production effectively, which contributed to the value-added utilization of lignocellulosic biomass.
authors.affiliation: State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.|University of Chinese Academy of Sciences, Beijing, 100049, China.
authors.forename: Li-Tong
authors.initials: LT
authors.lastname: Ma
authors.affiliation: State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.|University of Chinese Academy of Sciences, Beijing, 100049, China.
authors.forename: Zhi-Min
authors.initials: ZM
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Yu
authors.affiliation: State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China. hzchen@home.ipe.ac.cn.
authors.forename: Hong-Zhang
authors.initials: HZ
authors.lastname: Chen
mesh_terms: D000840:Anisoles / Q000494:pharmacology*; D055162:Biocatalysis / Q000187:drug effects; D018533:Biomass; D002480:Cellulase / Q000378:metabolism*; D007982:Levulinic Acids / Q000378:metabolism*; D008031:Lignin / Q000378:metabolism; D012275:Oryza / Q000737:chemistry* / Q000187:drug effects; D013227:Steam; D013696:Temperature; D013997:Time Factors; D014866:Waste Products
chemical_list: D000840:Anisoles; D007982:Levulinic Acids; D013227:Steam; D014866:Waste Products; C036909:lignocellulose; C009760:mequinol; D008031:Lignin; D002480:Cellulase; C032246:levulinic acid
keywords: Enzymatic pretreatment; Levulinic acid; Short fiber; Solid superacid; Steam-exploded rice straw