Abstract
The potential of banana peels (BPs) as a source of fermentable sugars for ethanol production was evaluated using two yeasts: Saccharomyces cerevisiae commercial strain and Kluyveromyces marxianus thermotolerant strain isolated from Agave honey. Different process configurations: simultaneous saccharification and fermentation (SSF), as well as presaccharification and simultaneous saccharification and fermentation (PSSF) at high solid loading (up to 25% w/w), were studied. Similar ethanol production 13 g/L and 11 g/L was achieved at 10–12 h on SSF for S. cerevisiae and K. marxianus at 35 and 41 °C, respectively, with 10% (w/w) BP. The highest ethanol concentration (32.6 g/L) was reached on PSSF process (at 64 h) using commercial S. cerevisiae strain with 25% (w/v) BP, while ethanol production was inhibited in the case of K. marxianus under same assay conditions. BPs are a suitable source for second-generation ethanol production. The advantage of S. cerevisiae in the PSSF in comparison with K. marxianus was demonstrated. The present study demonstrated that BPs are the promising feedstock for ethanol production by PSSF.
Published Version
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