title: Microwave assisted alkaline pretreatment to enhance enzymatic saccharification of catalpa sawdust.
abstract: Catalpa sawdust, a promising biofuel production biomass, was pretreated by microwave-water, -NaOH, and -Ca(OH)2to enhance enzymatic digestibility. After 48h enzymatic hydrolysis, microwave-Ca(OH)2pretreated sample showed the highest reducing sugar yield. The content of hemicellulose and lignin in catalpa sawdust decreased after microwave-alkali pretreatment. SEM observation showed that the catalpa sawdust surface with microwave-Ca(OH)2pretreatment suffered the most serious erosion. Crystallinity index of catalpa sawdust increased after all three kinds of pretreatment. The optimum conditions of microwave-Ca(OH)2pretreatment were particle size of 40mesh, Ca(OH)2dosage of 2.25% (w/v), microwave power of 400W, pretreatment time of 6min, enzyme loading of 175FPU/g, and hydrolysis time of 96h, and the reducing sugar yield of microwave-Ca(OH)2pretreated catalpa sawdust reached 402.73mg/g, which increased by 682.15% compared with that of raw catalpa sawdust. The catalpa sawdust with microwave-Ca(OH)2pretreatment is promising for biofuel production with great potential.
authors.affiliation: Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China. Electronic address: shuguangjin@126.com.
authors.forename: Shuguang
authors.initials: S
authors.lastname: Jin
authors.affiliation: School of Environment and Resource, Renmin University of China, Beijing 100872, China. Electronic address: zgm@ruc.edu.cn.
authors.forename: Guangming
authors.initials: G
authors.lastname: Zhang
authors.affiliation: Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China. Electronic address: panyue_zhang@bjfu.edu.cn.
authors.forename: Panyue
authors.initials: P
authors.lastname: Zhang
authors.affiliation: Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China. Electronic address: lipanlove1987@126.com.
authors.forename: Fan
authors.initials: F
authors.lastname: Li
authors.affiliation: Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China. Electronic address: 13020028182@163.com.
authors.forename: Siqi
authors.initials: S
authors.lastname: Wang
authors.affiliation: Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China. Electronic address: fanshiyang_1991@163.com.
authors.forename: Shiyang
authors.initials: S
authors.lastname: Fan
authors.affiliation: ShenZhen Techand Ecology & Environment CO. LTD., Shenzhen 518040, China. Electronic address: zhoushuqiong@sztechand.com.cn.
authors.forename: Shuqiong
authors.initials: S
authors.lastname: Zhou
mesh_terms: D000468:Alkalies / Q000737:chemistry*; D056804:Biofuels; D002482:Cellulose / Q000737:chemistry / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D008872:Microwaves; D014934:Wood / Q000737:chemistry / Q000378:metabolism
chemical_list: D000468:Alkalies; D056804:Biofuels; D002482:Cellulose
keywords: Biofuel; Catalpa sawdust; Enzymatic digestibility; Lignocellulosic structure; Microwave irradiation