Table 1 shows the composition of fusel oil used. The fermentation was monitored as the fall in density which is measured by a Mettler Toledo digital density meter. Yeast count and percentage
viability were determined by a modified methylene blue staining
method on a Thoma chamber (Erten, 1997). Samples for esters
and higher alcohols analysis were centrifuged and supernatants
were kept at 20 C until analyzed.