| Summary: | The aim of this study is to evaluate the potential of dried <i>Cystoseira barbata</i> alga for ethanol production through alcoholic fermentation. The influence of the main factors affecting the fermentation are studied in the frame of a 2<sup>3</sup> factorial experimental plan. The main factors influencing the process are the fermentation temperature (<i>t</i> from 25 °C to 35 °C), the solid to liquid ratio (<i>S/L</i> from 0.040 g/g to 0.080 g/g), and the cellulase ratio (<i>R</i> from 8 U/g d.m to 16 U/g d.m.). The maximum volatile compounds yield of 0.2808 g/g d.m and ethanol yield of 0.0158 g/g d.m were favored by the following experimental conditions: process temperature of 35 °C, solid to liquid ratio of 0.0415, and enzyme ratio of 16 U/g d.m. A statistical model was used to correlate the product yield with the process factors. Additionally, 19 interesting bioactive compounds were found in the enzymatic hydrolysis and alcoholic fermentation broths which seem likely to maintain natural defence mechanisms against diseases and physical disorders.
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