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Previous issue date: 2015 / A demanda por enzimas holocelulot?ticas tem aumentado nos ?ltimos anos, impulsionada, principalmente, pelo mercado rec?m estabelecido de etanol de 2? gera??o. Diante disso, o objetivo central desta tese foi avaliar o potencial de fungos filamentosos selecionados e de res?duos agroindustriais derivados de oleaginosas, usados aqui como fontes de carbono, para a produ??o de enzimas celulol?ticas e xilanol?ticas por fermenta??o em estado s?lido (FES) conduzida em batelada simples. O desenvolvimento deste projeto envolveu as seguintes etapas: caracteriza??o centesimal dos res?duos agroindustriais; avalia??o do potencial indutor de cada res?duo agroindustrial sobre a produ??o enzim?tica de holocelulases por cada uma das linhagens f?ngicas pesquisadas; otimiza??o da produ??o das hidrolases de interesse com o uso da linhagem f?ngica e do res?duo agroindustrial que se destacaram; caracteriza??o do extrato enzim?tico obtido na condi??o otimizada; e avalia??o da aplica??o do extrato enzim?tico obtido na condi??o otimizada na sacarifica??o de biomassas lignocelul?sicas. Cinco linhagens de fungos filamentosos, Aspergillus niger INCQS:40065, Aspergillus tubingensis AN1257, Fusarium oxysporum INCQS:40144, Penicillium oxalicum INCQS:40103 e Trichoderma reesei CCT2768, e seis res?duos agroindustriais, tortas de caro?o de algod?o, dend?, girassol, maca?ba, mamona e pinh?o manso, usados como fontes de carbono, foram avaliados para a produ??o das enzimas de interesse. Dentre as linhagens testadas, Aspergillus tubingensis AN1257 foi a que se destacou para a produ??o de enzimas celulol?ticas e xilanol?ticas, especialmente quando combinado com a torta de caro?o de algod?o. A otimiza??o de processo conduzida com A. tubingensis e a torta de caro?o de algod?o para a produ??o das atividades de CMCase, FPase, ?-glucosidase e xilanase apontou a raz?o s?lido:l?quido (S/L) de 35%, a fonte de nitrog?nio de 1,30 g de (NH4)2SO4 /100g torta, e o tamanho do in?culo de 1,00 x 107 con?dios/g de torta, como determinantes para a condi??o fermentativa otimizada. Nesta condi??o fermentativa otimizada foram obtidos valores de atividade aproximados de 20 U/g para CMCase, 50U/g para FPase, 300 U/g para ?-glucosidase e 1300 U/g para xilanase, ap?s 8 dias de fermenta??o. Os efeitos combinados da temperatura e do pH sobre as atividades das enzimas holocelulol?ticas produzidas por A. tubingensis AN1257 denotam uma boa aplicabilidade destas enzimas sob temperaturas entre 40 e 60?C, e pH em torno de 4,0 a 5,0. O extrato enzim?tico produzido por A. tubingensis AN1257 na condi??o fermentativa otimizada mostrou-se eficiente na sacarifica??o das pr?prias tortas vegetais usadas inicialmente como fontes de carbono, sobretudo quando aplicado em processo de sacarifica??o e fermenta??o simult?nea da torta de girassol pr?-tratada. Este processo resultou na produ??o de 16 g de etanol por 100g de torta de caro?o de algod?o e um mosto fermentado com a concentra??o de 20g/L de etanol. O conjunto dos resultados obtidos nesta tese aponta como promissor o uso de alguns res?duos agroindustriais e fungos filamentosos selecionados para a produ??o de enzimas holocelulol?ticas com potencial aplica??o para a produ??o de bioetanol de 2? gera??o.
Palavras / Programa de P?s-gradua??o em Biocombust?veis, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2015. / The demand for hollocelulolytic enzymes has increased in recent years, driven mainly by the newly established market for 2ndgeneration ethanol. The potential of selected filamentous fungi and derivatives of agro-industrial waste oil, used here as carbon sources for the production of cellulolytic and xylan-degrading enzymes, was evaluated. The development of the project involved the following steps: partial characterization of agro-industrial waste; the inducing potential of each agroindustrial residue on enzyme production by each filamentous fungus strain was investigated; optimization of the production of the hydrolases by the fungal strain and the agro-industrial waste that showed the greatest potential; characterization of the enzyme extract obtained under the optimum conditions; and evaluation of the implementation of the enzymatic extract obtained under the optimum condition for saccharification of lignocellulosic biomass. Five strains of filamentous fungi - Aspergillus niger INCQS: 40065, Aspergillus tubingensis AN1257, Fusarium oxysporum INCQS:40144, Penicillium oxalicum INCQS:40103 and Trichoderma reesei CCT2768 -- and six agro-industrial wastes -- cottonseed, palm, sunflower, maca?ba, castor and jatropha cakes, used as carbon sources -- were assessed for production of the enzymatic activities of interest. Among the strains tested, Aspergillus tubingensis AN1257 was most noteworthy for the production of cellulolytic and xylanase enzymes, especially when combined with cottonseed cake. The optimization conducted with A. tubingensis and cottonseed cake for the production of CMCase, FPase, ?-glucosidase and xylanase activities indicated that the conditions for an optimum fermentation were a solid/liquid (S/L) ratio of 35%, 1.30 g (NH4)2SO4/100 g cake as the source of nitrogen, and an inoculum size of 1.00 x 107 conidia/g of cake. Activity values of approximately 20 U/g for CMCase, 50 U/g for FPase, 300 U/g for ?-glucosidase and 1300 U/g for xylanase were obtained after 8 days of fermentation under optimized fermentation conditions. The combined effects of temperature and pH on the activities of the holocellulolytic enzymes produced by A. tubingensis AN1257 indicated that these enzymes were most efficient at temperatures between 40 and 60 ?C and pH between 4.0 and 5.0. The enzyme extract produced by A. tubingensis under optimized fermentation conditions was efficient in the saccharification of the same vegetable cakes initially used as carbon sources, especially when applied to the simultaneous saccharification and fermentation of pretreated sunflower cake. This process resulted in the production of 16 g of ethanol per 100 g of cottonseed cake and a fermented must with a concentration of 20 g/L of ethanol. Thus, the use of some agro-industrial wastes and selected filamentous fungi for the production of holocelulol?ticas enzymes with potential application for the production of 2nd generation bioethanol was shown to be very promising.
| Identifer | oai:union.ndltd.org:IBICT/oai:acervo.ufvjm.edu.br/jspui:1/1105 |
| Date | 15 December 2015 |
| Creators | Santos, Ricardo Salviano dos |
| Contributors | Reis, Ang?lica Pataro, Cardoso, Val?ria Macedo, Siqueira, F?lix Gon?alves de, Pereira JR, Nei, Santos, Alexandre Soares dos, Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), Santos, Alexandre Soares dos |
| Publisher | UFVJM |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFVJM, instname:Universidade Federal dos Vales do Jequitinhonha e Mucuri, instacron:UFVJM |
| Rights | A concess?o da licen?a deste item refere-se ao ? termo de autoriza??o impresso assinado pelo autor, assim como na licen?a Creative Commons, com as seguintes condi??es: Na qualidade de titular dos direitos de autor da publica??o, autorizo a Universidade Federal dos Vales do Jequitinhonha e Mucuri e o IBICT a disponibilizar por meio de seus reposit?rios, sem ressarcimento dos direitos autorais, de acordo com a Lei n? 9610/98, o texto integral da obra disponibilizada, conforme permiss?es assinaladas, para fins de leitura, impress?o e/ou download, a t?tulo de divulga??o da produ??o cient?fica brasileira, e preserva??o, a partir desta data., info:eu-repo/semantics/openAccess |
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