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The optimum condition of durian skin using SSF process with encapsulation of Saccharomyces cerevisiae takes place at pH 5.0 at 37 °C. S. cerevisiae encapsulation can increase bioethanol production activity. Bioethanol production is produced at pH 4.5; 5.0 and 5.5 were 35.85, 41.25 and 39.89 g/L medium, respectively. While using free cells S. cerevisiae, bioethanol produced was 21.42, 34.94 and 28.15 g/L medium. The percentage of bioethanol produced by S. cerevisiae was 15.3 % at pH 5.0; 40.25 % at pH 4.5 and 29.43 % at pH 5.5. Encapsulation of S. cerevisiae cells can increase the resistance to process temperature by differences in bioethanol production between encapsulation with cells free of S. cerevisiae by 19.34 % at 37 °C, 24.02 % at 40 °C and 49.01 % at 45 °C. These results are higher compared to cells free of S. cerevisiae.

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