1. Introduction
Ethanol is considered as one of the most promising renewable
fuel that can replace fossil fuels-based transportation fuels. It is
most commonly produced by microbial (most often yeast) catalyzed
fermentations using plant biomass as a raw material. Starchy
raw materials (i.e. corn, wheat, sorghum) are still the most common
feedstocks for fuel ethanol production in temperate climate regions
of the world (Europe, North America, Central Asia). However its use
as fuel production resources may affect on the prices of food products
manufactured from them [1]. The use of non-edible parts of the
plant (straws, stalks), known as the lignocellulose biomass, as the
raw material in distillery is nowadays considered as the most promising
opportunity for ethanol production that does not affect the
prices of foodstuffs [2]. However, the conversion of lignocellusosic
biomass into fermentable sugars and, subsequently into ethanol