The optimiza-
tion for energy demand for starch hydrolysis for ethanol produc-
tion led to development of simultaneous saccharification and
fermentation (SSF) process, in which liquefied starch slurry is
cooled to temperature where yeast are able to ferment and gluco-
amylase is added so the sacchrification of dextrins and utilization
of resulting monomeric sugars occurs at the same time [20]. The
most recent development in the field of processing starchy raw
materials to ethanol is the direct starch to ethanol conversion
using granular starch hydrolyzing enzyme (GSHE). GSHE is
obtained from genetically modified Trichoderma reesei and it shows
the activity of a-amylase and glucoamylase displaying on the sur-
face of starch granules. Earlier studies shown that the efficiency of
direct starch to ethanol conversion process is comparable to
‘traditional’ technologies [21] and its advantage is lower energy