title: Comparison of bamboo green, timber and yellow in sulfite, sulfuric acid and sodium hydroxide pretreatments for enzymatic saccharification.
abstract: The response and behavior of bamboo green, timber, and yellow of moso bamboo (Phyllostachys heterocycla) to three pretreatments, sulfite (SPORL), dilute acid (DA), and alkali (NaOH), were investigated and compared with varied chemical loadings at 180°C for 30 min with a 6.25:1 (v/w) liquor-to-bamboo ratio. All the pretreatments improved the enzymatic digestibility of bamboo substrates. Under the investigated conditions, the DA pretreatment achieved better enzymatic digestibility, but had lower sugar recovery yield, and formed more fermentation inhibitors. The results suggested that the SPORL pretreatment be able to generate more readily digestible bamboo substrate with higher sugar yield and fewer fermentation inhibitors than the corresponding DA pretreatment if hemicelluloses are sufficiently removed by adding more acid to bring down the pretreatment pH. Bamboo timber had higher sugar content and better enzymatic digestibility and therefore was a better feedstock for bioconversion than bamboo green and yellow.
authors.affiliation: International Centre for Bamboo and Rattan, Beijing 100102, China.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Li
authors.forename: Zehui
authors.initials: Z
authors.lastname: Jiang
authors.forename: Benhua
authors.initials: B
authors.lastname: Fei
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Cai
authors.forename: Xuejun
authors.initials: X
authors.lastname: Pan
mesh_terms: D031723:Bambusa / Q000187:drug effects*; D050260:Carbohydrate Metabolism / Q000187:drug effects*; D002473:Cell Wall / Q000378:metabolism; D002480:Cellulase / Q000378:metabolism*; D005285:Fermentation / Q000187:drug effects; D006868:Hydrolysis / Q000187:drug effects; D008031:Lignin / Q000378:metabolism; D012972:Sodium Hydroxide / Q000494:pharmacology*; D013447:Sulfites / Q000494:pharmacology*; D013464:Sulfuric Acids / Q000494:pharmacology*; D013997:Time Factors; D014934:Wood / Q000187:drug effects*; D001617:beta-Glucosidase / Q000378:metabolism
chemical_list: D013447:Sulfites; D013464:Sulfuric Acids; D012972:Sodium Hydroxide; D008031:Lignin; D001617:beta-Glucosidase; D002480:Cellulase; C033158:sulfuric acid
keywords: Alkali pretreatment; Bamboo; DA; Dilute acid; Dilute acid pretreatment; Enzymatic saccharification; SPORL; SPORL pretreatment; Sulfite Pretreatment to Overcome Recalcitrance of Lignocellulose