| Texto completo | |
| Autor(es): |
Kaschuk, Joice Jaqueline
[1]
;
Santos, Darlisson de Alexandria
[2, 3]
;
Frollini, Elisabete
[1]
;
Canduri, Fernanda
[4]
;
Meleiro Porto, Andre Luiz
[2]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Inst Chem Sao Carlos, Ctr Res Sci & Technol BioResources, Macromol Mat & Lignocellulos Fibers Grp, CP 780, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Sao Paulo, Inst Chem Sao Carlos, Ctr Res Sci & Technol BioResources, Lab Organ Chem & Biocatalysis, CP 780, BR-13563120 Sao Carlos, SP - Brazil
[3] Univ Fed Sul & Sudeste Para, Inst Ciencias Exatas, Fac Quim, Folha 17, Quadra 04, BR-68505080 Maraba, PA - Brazil
[4] Univ Sao Paulo, Inst Chem Sao Carlos, CP 780, BR-13560780 Sao Carlos, SP - Brazil
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | BIOMASS CONVERSION AND BIOREFINERY; v. 10, n. 2, p. 483-494, JUN 2020. |
| Citações Web of Science: | 0 |
| Resumo | |
This study aimed to evaluate the production of cellulases from Aspergillus sp. CBMAI 1198, through solid-state fermentation, and their actions on different cellulosic materials (microcrystalline cellulose, sisal pulp, and filter paper). The influence of pH, temperature, and composition of substrates (sisal pulp and wheat straw), on the filter paper activity (FPase) of the cellulases produced from these substrates, was investigated using a complete central factorial composite design. Low temperature (32 degrees C), sisal pulp content (25%), and pH (5.0) led to the production of enzymes with higher activity (0.244 UmL(-1)). The results on the reducing sugars produced by the enzymatic hydrolysis of microcrystalline cellulose, sisal pulp, and filter paper showed that the cellulosic material with a higher content of hemicelluloses and lower crystallinity (filter paper) exhibited the better result (8.04 mu mol mL(-1)). Non-hydrolyzed microcrystalline cellulose, sisal pulp, and filter paper were withdrawn from the medium during the reaction, and changes in their physicochemical properties were monitored assessing changes in molar mass, crystallinity index, surface morphology (scanning electron microscopy), and fiber lengths and thicknesses (MorFi technique). This approach on the properties of non-hydrolyzed fibers differentiates this study from those found in the literature. The results showed that cellulases were successfully produced from Aspergillus sp. and, despite the low yield, these enzymes hydrolyzed cellulosic materials with different properties. The approach of the present study, as well as the set of results obtained, added novelty to the respective area, and are important for the deepening of the investigations. (AU) | |
| Processo FAPESP: | 12/00116-6 - Materiais baseados em matéria prima oriunda de fonte renovável |
| Beneficiário: | Elisabete Frollini |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 12/21576-5 - Estudo da hidrólise ácida e enzimática da polpa de sisal |
| Beneficiário: | Joice Jaqueline Kaschuk |
| Modalidade de apoio: | Bolsas no Brasil - Mestrado |