RESUMO
The sorption ability of Candida utilis biomass for cadmium ions with accumulating competence of dried cells and cells in alginate was compared. After an optimization of process conditions (pH 5.5, biomass concentration 1 g/L and c0 50 mg/L), the cadmium sorption capacity of dried yeast biomass was perceptibly higher than that of the other tested adsorbents. Considering the sorption of the dried yeast biomass equal to 100 %, the cells in alginate reached 86 % while native cells showed only 42 %.
Assuntos
Cádmio/química , Candida/química , Adsorção , Alginatos , Biodegradação Ambiental , Biomassa , Cádmio/farmacocinética , Poluentes Ambientais/farmacocinética , Ácido Glucurônico , Ácidos Hexurônicos , Espectrofotometria AtômicaRESUMO
Sorption properties of Streptomyces noursei mycelium for copper ions were compared with the accumulation competence of dried and native yeast (Candida utilis) biomass. The copper sorption capacity of S. noursei after optimization was found to be higher than that of the two other adsorbents (dried yeast biomass 82 %, native Candida cells 48 % of the sorption capacity of the S. noursei mycelium).
Assuntos
Candida/química , Cobre/metabolismo , Micélio/química , Streptomyces/química , Adsorção , Biomassa , Candida/crescimento & desenvolvimento , Cobre/química , Concentração de Íons de Hidrogênio , Microbiologia Industrial/métodos , Micélio/crescimento & desenvolvimento , Soluções , Streptomyces/crescimento & desenvolvimento , Purificação da ÁguaRESUMO
The cultivation of the yeast Trigonopsis variabilis producing D-amino-acid oxidase (an enzyme participating in the transformation of cephalosporin C into 7-aminocephalosporanic acid for the production of beta-lactam antibiotics) was controlled by changes of dissolved oxygen tension and extended fermentation times. The production technology was optimized on a laboratory scale and scale-up parameters were identified.
