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Comparative evaluation of the action of two different endoglucanases. Part II: On a biobleached acid sulphite pulp

Cellulose (London), 2015-06, Vol.22 (3), p.2081-2093 [Tạp chí có phản biện]

Springer Science+Business Media Dordrecht 2015 ;Cellulose is a copyright of Springer, (2015). All Rights Reserved. ;info:eu-repo/semantics/openAccess ;ISSN: 0969-0239 ;EISSN: 1572-882X ;DOI: 10.1007/s10570-015-0631-1

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Nhan đề:
Comparative evaluation of the action of two different endoglucanases. Part II: On a biobleached acid sulphite pulp
Tác giả: Quintana, Elisabet ; Valls, Cristina ; Vidal, Teresa ; Roncero, M. Blanca
Chủ đề: Biobleached pulp ; Bioorganic Chemistry ; Blanqueig ; Bleaching ; carbohydrate composition ; Carbohydrates ; cellobiose ; Cellulase ; Cellulose ; Cellulose fibers ; Cel·lulosa ; Ceramics ; Cerrena unicolor ; Chain scission ; Chemistry ; Chemistry and Materials Science ; cold ; Cold treatment ; Composites ; Composition ; Dissolving pulp ; endo-1,4-beta-glucanase ; Endoglucanase ; Enginyeria paperera ; Fock solubility ; Glass ; Glucose ; hemicellulose ; Hydrogen peroxide ; Laccase ; mechanism of action ; Morphology ; Natural Materials ; NMR ; Nuclear magnetic resonance ; nuclear magnetic resonance spectroscopy ; Oligosaccharides ; Oligosacàrids ; Organic Chemistry ; Original Paper ; Paenibacillus ; Pasta paperera ; Physical Chemistry ; Polymer Sciences ; Primeres matèries papereres ; Purification ; Reactivity ; Solubility ; Sustainable Development ; Viscosity ; Wood-pulp ; Àrees temàtiques de la UPC
Là 1 phần của: Cellulose (London), 2015-06, Vol.22 (3), p.2081-2093
Mô tả: A TCF sulphite pulp, bleached at the laboratory scale with a laccase–violuric acid system and complemented with a pressurized hydrogen peroxide stage, was treated with two endoglucanases, one obtained from Paenibacillus barcinonensis (B) and the other one produced from Cerrena unicolor (F) to improve cellulose reactivity. The treated pulps were evaluated in terms of brightness, viscosity, α-cellulose, water retention value, fibre morphology, Fock solubility, NMR and carbohydrate composition of pulps and liquors. Results revealed that both endoglucanases improved cellulose reactivity, albeit in a different way; thus, B caused no scissions in the cellulose chain and no significant reduction in fibre length, whereas F decreased viscosity and shortened fibre length, leading to lower reactivity value. The liquor composition of soluble carbohydrates released by the enzymatic treatments revealed the B had a processive mode of action since short oligosaccharides, cellobiose and glucose, were obtained. F hydrolysed, from high to low concentration, cellobiose, glucose and cellotriose. Importantly, environmentally friendly dissolving pulp with 90 % Fock solubility was obtained, combining two enzymatic treatments: a laccase–mediator system and then a cellulase from P. barcinonensis (B). In order to improve the quality of final dissolving pulp, a pulp purification step was introduced before the B endoglucanase treatment. The cold caustic extraction lead to reduce the amount of hemicelluloses by 42 % with respect to biobleached pulp, but Fock solubility was also reduced. However, complementing the purification step with F treatment, reduced the amount of hemicelluloses but also improved Fock solubility by 17 %, although some presence of cellulose II was detected by NMR.
Nơi xuất bản: Dordrecht: Springer-Verlag
Ngôn ngữ: English
Số nhận dạng: ISSN: 0969-0239
EISSN: 1572-882X
DOI: 10.1007/s10570-015-0631-1
Nguồn: Recercat
ProQuest Central

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Comparative evaluation of the action of two different endoglucanases. Part II: On a biobleached acid sulphite pulp

Springer Science+Business Media Dordrecht 2015 ;Cellulose is a copyright of Springer, (2015). All Rights Reserved. ;info:eu-repo/semantics/openAccess ;ISSN: 0969-0239 ;EISSN: 1572-882X ;DOI: 10.1007/s10570-015-0631-1

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