title: Pretreatment combining ultrasound and sodium percarbonate under mild conditions for efficient degradation of corn stover.
abstract: Ultrasound (US) can be used to disrupt microcrystalline cellulose to give nanofibers via ultrasonic cavitation. Sodium percarbonate (SP), consisting of sodium carbonate and hydrogen peroxide, generates highly reactive radicals, which cause oxidative delignification. Here, we describe a novel pretreatment technique using a combination of US and SP (US-SP) for the efficient saccharification of cellulose and hemicellulose in lignocellulosic corn stover. Although US-SP pretreatment was conducted under mild condition (i.e., at room temperature and atmospheric pressure), the pretreatment greatly increased lignin removal and cellulose digestibility. We also determined the optimum US-SP treatment conditions, such as ultrasonic power output, pretreatment time, pretreatment temperature, and SP concentration for an efficient cellulose saccharification. Moreover, xylose could be effectively recovered from US-SP pretreated biomass without the formation of microbial inhibitor furfural.
authors.affiliation: Department of Chemical Engineering, Tohoku University, Aoba-yama 6-6-07, Aoba-ku, Sendai 980-8579, Japan. Electronic address: naka@rpel.che.tohoku.ac.jp.
authors.forename: Kazunori
authors.initials: K
authors.lastname: Nakashima
authors.affiliation: Department of Chemical Engineering, Tohoku University, Aoba-yama 6-6-07, Aoba-ku, Sendai 980-8579, Japan.
authors.forename: Yuuki
authors.initials: Y
authors.lastname: Ebi
authors.affiliation: Department of Chemical Engineering, Tohoku University, Aoba-yama 6-6-07, Aoba-ku, Sendai 980-8579, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Kubo
authors.affiliation: Department of Chemical Engineering, Tohoku University, Aoba-yama 6-6-07, Aoba-ku, Sendai 980-8579, Japan.
authors.forename: Naomi
authors.initials: N
authors.lastname: Shibasaki-Kitakawa
authors.affiliation: Department of Chemical Engineering, Tohoku University, Aoba-yama 6-6-07, Aoba-ku, Sendai 980-8579, Japan.
authors.forename: Toshikuni
authors.initials: T
authors.lastname: Yonemoto
mesh_terms: D018533:Biomass; D002254:Carbonates / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry; D008031:Lignin / Q000737:chemistry; D011134:Polysaccharides / Q000737:chemistry; D013010:Sonication; D014994:Xylose / Q000737:chemistry; D003313:Zea mays / Q000737:chemistry*
chemical_list: D002254:Carbonates; D011134:Polysaccharides; C036909:lignocellulose; C007916:hemicellulose; D002482:Cellulose; D008031:Lignin; D014994:Xylose; C034738:sodium percarbonate
keywords: Cellulose; Enzymatic saccharification; Lignocellulose; Pretreatment; Ultrasound