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Optimization of xanthan gum production by demerara sugar using response surface...

Ramos, Larissa Castor; Jesus, Meirielly Santos; Pires, Preciosa; Fontes-Junior, Alberto S.; Nunes, Erica S.; Santos, Klebson S.; Teixeira, J. A.

Xanthan gum (XG) production using three Xanthomonas sp. strains (290, 472, and S6) was evaluated by applying a 23 full factorial central composite design response to study the interactive effects of the fermentation medium component concentrations as parameters to determine the efficiency of the gum production in batch experiments. The experimental variables were the carbon source (demerara sugar or sucrose), p...


Corncob as carbon source in the production of xanthan gum in different strains ...

Jesus, Meirielly; Mata, Fernando; Batista, Rejane A.; Ruzene, Denise S.; Albuquerque-Júnior, Ricardo; Cardoso, Juliana C.; Vaz-Velho, Manuela

Xanthan gum (XG) is a biopolymer obtained in fermentation and used as a rheology control agent in aqueous systems and in stabilizing emulsions and suspensions. XG, together with other polysaccharides, can form soft, cohesive composite gels. The carbon source in the fermentative process is responsible for one-third of the production costs, and the search for less expensive and sustainable alternatives is ongoing...

Date: 2023   |   Origin: Repositório Científico IPVC

Sunflower stalk as a carbon source inductive for fungal xylanase production

de Souza, Jaqueline B.; Michelin, Michele; Amâncio, Francisco L. R.; Vital Brazil, Osiris A.; Polizeli, Maria de Lourdes T. M.; Ruzene, Denise S.

Supplementary material related to this article can be found, in the online version, at doi:https://doi.org/10.1016/j.indcrop.2020.112368.; Enzymes represent a growing market due to their industrial applications, whose use on a large scale is restricted by their high cost of production. This stimulates studies with other sources such as the use of agro-industrial lignocellulosic residues in the medium compositio...


Mycoremediation of vinasse by surface response methodology and preliminary stud...

Aragão, Moniky S.; Menezes, Diego B.; Ramos, Larissa C.; Oliveira, Helon S.; Bharagava, Ram Naresh; Ferreira, Luiz F. Romanholo; Teixeira, J. A.

This work evaluated the degradation of sugarcane vinasse with the production of biomass by Pleurotus sajor-caju CCB020, considering the combination of temperature and pH effects, using surface response methodology (RSM). A 22 complete central factorial composite experiment was used to analyze the results. The optimum temperature and pH values were respectively 27°C and 5.6 for maximum decolorization yield and 2...


Production of biomass-degrading enzymes by Trichoderma reesei using liquid hot ...

Michelin, Michele; Mota, André; Silva, Daniel P.; Ruzene, Denise S.; Vicente, A. A.; Teixeira, J. A.

Enzymatic hydrolysis accounts for 20% of the total cost in the conversion process of lignocellulosic biomass into bioethanol. Therefore, production of biomass-degrading enzymes by using lignocellulosic residue as a fermentation substrate may be an alternative to decrease the production costs. In this study, corncob (CC) has been pretreated by liquid hot water (LHW) at 200 °C for 30 min and used as inducer sourc...


Cellulose from lignocellulosic waste

Michelin, Michele; Ruíz, Héctor A.; Silva, Daniel Pereira da; Ruzene, Denise S.; Teixeira, J. A.; Polizeli, Maria de Lourdes T. M.

Bioconversion of renewable lignocellulosic biomass to biofuel and value-added products is globally gaining significant importance. Lignocellulosic wastes are the most promising feedstock considering its great availability and low cost. Biomass conversion process involves mainly two steps: hydrolysis of cellulose in the lignocellulosic biomass to produce reducing sugars and fermentation of the sugars to ethanol ...


Pré-tratamento de resíduos agro-industriais e novas perspectivas na produção de...

Freitas, S. S.; Brazil, O. A. Vital; Nascimento, M. B.; Ferreira, L. F. Romanholo; Gonçalves, A. R.; Michelin, Michele; Polizeli, Maria de Lourdes T. M.

Visando contribuir para a melhoria das condições ambientais pela eliminação dos resíduos agrícolas/agroindustriais, bem como proporcionar a formação de uma linha de pesquisa com propósito de captar e disseminar informações técnicas e tecnológicas agregando maior valor nestes subprodutos ou resíduos é que o presente trabalho foi realizado. Deste modo, o sabugo de milho in natura foi submetido a dois diferentes p...


Autohydrolysis pretreatment of corncob for cellulase production by Trichoderma ...

Michelin, Michele; Ruzene, Denise S.; Silva, Daniel Pereira da; Vicente, A. A.; Jorge, João A.; Teixeira, J. A.; Polizeli, Maria de Lourdes T. M.

Microbial cellulase production has attracted great attention due its several applications. In this context, studies that become this practice feasible are very important. Corncob is an inexpensive byproduct, which contains more than 30% of cellulose; however, this material is not readily available to enzymatic hydrolysis and pretreatment of lignocellulosic material in autohydrolysis processes become this more e...


Evaluation of autohydrolysis process for cellulases production by Aspergillus n...

Michelin, Michele; Ruzene, Denise S.; Silva, Daniel Pereira da; Vicente, A. A.; Teixeira, J. A.; Polizeli, Maria de Lourdes T. M.

Lignocellulosic residues, such as corncob, are a complex matrix composed by cellulose, hemicellulose and lignin that can be used for different biotechnological applications (e.g. enzymes production). However, the applications of these crude residues as substrate for enzymes production are often inefficient. An efficient hydrolysis of these residues requires a pretreatment (e.g. autohydrolysis) that lead to a mo...


Bioethanol production from hydrothermal pretreated wheat straw by a flocculatin...

Ruíz, Héctor A.; Silva, Daniel Pereira da; Ruzene, Denise S.; Lima, Luís; Vicente, A. A.; Teixeira, J. A.

Wheat straw is nowadays being considered a potential lignocellulose raw material for fuel ethanol production of second generation and as an alternative to conventional fuel ethanol production from cereal crops. In the present study, hydrothermal pretreated wheat straw with high cellulose content (>60%) at 180 °C for 30 min was used as substrate in simultaneous saccharification and fermentation (SSF) process for...


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