after three months. Sucrose degradation in conventionally
produced jam may be attributed to the influence of
fruit acids. In pressure-treated fruits the sucrose level
dropped much faster than in conventionally produced
jam. It may be concluded from these results that also an
enzymatic degradation (e.g. by invertase) is taking place
in the case of pressure-treated fruits or jam. Beyond this,
it has been shown that invertase from bakers yeast is
extremely pressure-stable up to 600 MPa. Invertase is an
enzyme that converts sucrose into equimolar amounts of
fructose and glucose. From Fig. 2 it can be seen that
fructose and glucose levels increase during storage while
sucrose decreases, a typical result of invertase action.
Generally, in foods that have undergone pressure