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Different encapsulation matrices were tested for immobilized cells of Candida guilliermondii UFMG-Y65 used for acetonitrile degradation. Acetonitrile degradation by free cells and cells immobilized in Ba-alginate, kappa-carrageenan and citric pectin was studied. The rate of acetonitrile degradation was monitored for 120 h by measuring yeast growth and ammonia concentration. Different alginate concentrations did not affect cell viability, but the period of incubation in BaCl2 solution reduced the number of viable cells. Likewise, the gel nature and the matrix structure of the support resulting from the cell immobilization conditions were of fundamental importance for biocatalyst activity and performance, affecting substantially the patterns of microbial growth and enzymatic activity. Alginate-immobilized cells degraded acetonitrile more efficiently than kappa-carrageenan or citric pectin-immobilized cells. Na degradação de acetonitrila, foram testadas células livres de Candida guilliermondii UFMG-Y65 e imobilizadas em diferentes suportes, quais sejam, Ba-alginato, kapa-carrageno e pectina cítrica. A velocidade de degradação da acetonitrila foi monitorada por 120 h, mediante o crescimento da levedura e geração de amônia. Diferentes concentrações de alginato não afetam a viabilidade das células; mas o período de incubação, em solução de BaCl2, reduziu o número de células vivas. Da mesma forma, a natureza do gel e a estrutura da matriz do suporte, ambas resultantes das condições de imobilização das células, foram de fundamental importância para a atividade catalisadora e sua performance; afetando assim, os padrões de crescimento microbiano e a de atividade enzimática. As células imobilizadas em alginato degradaram acetonitrila com maior eficácia do que as imobilizadas em kapa-carrageno ou as células imobilizadas em pectina cítrica

Biodegradation of acetonitrile by cells of Candida guilliermondii UFMG-Y65 immobilized in alginate, kappa-carrageenan and citric pectin