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The ethanol production in Colombia represents one of the more important economic lines, produced like antiseptic, reliable alcohol and additive for the gasoline. The porpuse of this work was of to increase the efficiency in the production of ethanol and to find a microorganism that represents an alternative in production, in front a Saccharomyces cerevisiaeit. Stocks of Zymomonas mobilisto var. mobilis(Zmm1 and Zmm2) and pomaceae (Zmp1 and Zmp2), they were isolated of samples of molasses of sugar cane in order to previously make a comparative study with results reported from free cells. A stock was used control Zymomonas mobilis mobilis (CETC) 560, considered high ethanol producer. Free cells in fermentador of 1L and were immobilized in matrix of calcium alginate. At the end of the fermentation process the ethanol production was determined by picnometry; results revealed to a concentration of immobilization of 2% p/v, a yield of 92. 1%, on the part of the native stocks Zmm1 and Zmm2 and of 97. 85%, with Zmm compared 560, with the obtained yields of ethanol from free cells, 72. 9% on the part of Zmm1 and 76. 74% with Zmm 560. The analysis of these data, demonstrates to the

PRODUCCIÓN DE ETANOL CON CÉLULAS INMOVILIZADAS DE Zymomonas mobilis spp.