Regarding the influence of the
inulinase concentration on the ethanol yield, the highest yield
(0.424 ± 0.016 g g−1) was achieved with 0.25 mL of inulinase per
litre of juice (Fig. 1), although more fermentable sugars were released
during the juice treatment with 1.25 mL L−1 (Fig. 2). Similar
ethanol yields were obtained with the inulinase concentrations of
0.05 mL L−1 (0.396 ± 0.029 g g−1) and 1.25 mL L−1 (0.417 ±
0.026 g g−1). Nevertheless, lower time of fermentation was required
with 1.25 mL L−1 (68 h) than with the other doses (92 h).