Seleção de leveduras potencialmente produtoras de vitaminas do complexo B e estudo do processo fermentativo visando aplicação em alimentação animal / Screening of potential B-vitamin producer yeasts and the study of fermentation process for feed application

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The present work had as the main the objective, the isolation and selection of potential B-vitamin producer yeast and the study of fermentative process for B-vitamin production for feed application. Among 267 isolated strains, one was selected as extracellular thiamine producer and the strain Candida sp. LEB 130 as riboflavin and biotin producer. In the study of different carbon and nitrogen sources effect on the production of riboflavin by the screened yeast, including complex compounds, considerable results were obtained by using molasses, flaxseed oil and xylose. As for the study of pH, temperature and agitation of flasks for riboflavin production by Candida sp. LEB 130 yeast, using statistical design 23 as a tool, the highest riboflavin production occurred at pH 5.0 after 48 h of fermentation at 400C and 160 rpm of stirring. The highest productivity of riboflavin production (0.31 mg/mL.h) was obtained in the fermentation of yeast at pH 7.7, 400C and 100 rpm. As for the study of medium components for yeast fermentation for riboflavin production using factorial design 25, it was observed significant effect of sucrose, yeast extract Prodex LacÒ and the interaction between ZnSO4 and flaxseed oil in the limit of confidence of 90%. As for factorial design 24, without the addition of yeast extract Prodex LacÒ, the most significant factors were ZnSO4 and flaxseed oil in the limit of confidence of 90%. Taking into account that Candida sp. LEB 130 strain produces both riboflavin and biotin, a study of the simultaneous production of both vitamins was done. In the study of the medium compounds in the fermentation process of the strain for both vitamins production, sucrose and mineral salts were significant for riboflavin production, while sucrose, ammonium tartrate, ferric citrate and magnesium sulphate were significant for biotin production in the confidence level of 95%. Statistical designs experiments to evaluate the effect of culture medium components and fermentation conditions were important for the study of fermentation process of screened yeast Candida sp. LEB 130 and production of riboflavin and biotin. Riboflavin and biotin production by yeast were 155.7 mg/mL and 5,6mg/mL, respectively, which is 77.8- and 2.9-fold higher than at the moment of isolation, respectively. Nonetheless, it should be considered that this microorganism is a wild type, without any genetic engineering modification

ASSUNTO(S)

yeasts screening b-vitamin vitamina b - complexo - produção experimental design planejamento experimental leveduras - seleção fermentação fermentation

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