title: Pretreatment of Miscanthus stalk with organic alkali guanidine and amino-guanidine.
abstract: Organic alkali guanidine and amino-guanidine were used as catalysts to pretreat Miscanthus stalks. The effects of catalyst loadings, pretreatment temperature and time, on pretreatment results were studied. Between guanidines and amino-guanidines, guanidines were of benefit to produce hexose and amino-guanidines were in favor of producing pentose in stalk enzymolysis process. SEM images showed that the stalk surface after pretreatment were porous, cracked, and corroded. XRD data showed that the relative crystallinity index of cellulose after pretreatment was increased. FTIR spectra illustrated that both guanidine and amino-guanidine were effective to remove lignin and degrade hydrogen bonds of cellulose. TG data indicated that the initial temperature of rapid weight loss of Miscanthus stalks pretreated by the guanidine was higher than that by the amino-guanidine. The maximum sugar yields of Miscanthus stalks pretreated by the guanidine and the amino-guanidine after enzymolysis for 24 h were 350 and 370 mg/g stalks, respectively.
authors.affiliation: College of Science, Center of Biomass and Bioenergy Research, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.affiliation: College of Science, Center of Biomass and Bioenergy Research, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.affiliation: College of Science, Center of Biomass and Bioenergy Research, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: Piaopiao
authors.initials: P
authors.lastname: Xu
authors.affiliation: College of Science, Center of Biomass and Bioenergy Research, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: Pingping
authors.initials: P
authors.lastname: Xu
authors.affiliation: College of Science, Center of Biomass and Bioenergy Research, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Zhao
authors.affiliation: College of Science, Center of Biomass and Bioenergy Research, Huazhong Agricultural University, Wuhan 430070, China. Electronic address: yunwang123@126.com.
authors.forename: Yun
authors.initials: Y
authors.lastname: Wang
mesh_terms: D000468:Alkalies / Q000494:pharmacology*; D000588:Amines / Q000494:pharmacology*; D001709:Biotechnology / Q000379:methods*; D002241:Carbohydrates / Q000032:analysis; D002384:Catalysis; D002482:Cellulose / Q000737:chemistry / Q000378:metabolism; D003460:Crystallization; D019791:Guanidine / Q000494:pharmacology*; D006109:Poaceae / Q000187:drug effects* / Q000648:ultrastructure; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry
chemical_list: D000468:Alkalies; D000588:Amines; D002241:Carbohydrates; D002482:Cellulose; D019791:Guanidine
keywords: Amino-guanidine; Guanidine; Miscanthus stalks; Pretreatment