In the experimental runs characterized by an high concentration
both of glucose and fructose (runs 1C, 1B) initially present in the
reaction medium, D-fructose conversion became more difficult than
D-glucose transformation both for the S. cerevisiae strain and for the
S. bayanus strain, so that D-fructose has not been totally metabolized
by yeasts and can be found partially unconverted in the reaction
medium