Ethanol production using TSC-cells was further examined by five-cycle repeated batch fermentation. The results of the ethanol production and reducing sugar consumption by the immobilized cells were compared to those using the suspended cells (SC). The duration of the experiments on each batch was 48 h, and the initial sugar concentration was 240 g/L. Table 1 summarizes the yields, end products and productivities of the repeated batch fermentations. In the first batch, the initial rates of ethanol production and sugar consumption in the TSC-cell culture were slightly lower than those in the SC culture. Nonetheless, the final end-product concentration, overall sugar consumption and ethanol yield (YP/S) were similar in both cultures. From the second to the fifth batch of TSC-cell culture, the ethanol production, sugar consumption and YP/S appeared higher than those in the SC culture. A remarkably higher stability of the TSC-cell over SC was observed in the fifth batch. While the final ethanol concentration in the SC system dropped dramatically to 9.9 g/L in the fifth batch, a final ethanol concentration of 77.6 g/L was maintained in the TSC-cell system. High concentrations of ethanol have been reported to inhibit the growth and metabolism of free S. cerevisiae cells [14]. The enhanced cell stability of the immobilized cell culture compared to the free cell culture implies that the TSC carriers may have protected the yeast cells from toxic conditions during the fermentation process. The increased stability of the immobilized cells over the non-immobilized cells is attributed to the immobilization matrices’ protective effects against the toxicity of metabolic products, as previously reported [3] and [4].