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vol.21 issue2PREDICTING A DIETETIC FORMULA SHELF LIFE USING THE AVAILABLE LYSINE DECREASEEVALUATION OF TWO METHODOLOGIES OF EXPANSION IN OVEN OF SOUR CASSAVA STARCH author indexsubject indexarticles search
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Food Science and Technology

Print version ISSN 0101-2061On-line version ISSN 1678-457X

Abstract

ALBERTINI, Silvana; CARMO, Leandro Francisco do  and  PRADO FILHO, Luiz Gonzaga do. ISOTHERMS OF CADMIUM ADSORPTION BY Saccharomyces cerevisae. Ciênc. Tecnol. Aliment. [online]. 2001, vol.21, n.2, pp.134-138. ISSN 0101-2061.  http://dx.doi.org/10.1590/S0101-20612001000200002.

With the objective of determining the isotherms of cadmium the adsorption by Saccharomyces cerevisiae, the chloride and nitrate salts were used in the concentrations of 5, 10, 20, 40, 60, 80, and 100mg L-1. The biomass was produced from a starter culture of Saccharomyces cerevisiae IZ 1904. After a 16h contact between the microrganism and solutions of study the biomass was separated by a centrifuge and the cadmium residue content was determined at the supernatant by atomic adsorption spectrophotometry. For the two salts used a growing accumulation of cadmium was observed at concentrations of 5, 10, 20, and 40mg L-1. In the concentrations of 60, 80 and 100mg L-1 a decreasing of the accumulation of the metal was observed, evidencing damages of the cellular wall, which they're not accompanied always by damages of the citoplasmatic membrane, visualized by scanning electron microscopy.

Keywords : Saccharomyces cerevisiae; cadmium; adsorption; isotherm.

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