In general, freezing point of ice cream mixes depends on
concentration of soluble constituents and varies with any
changes in composition. For instance, the freezing point of
an ice cream mix [containing 12 % fat, 11 % milk solids
non-fat (MSNF), 15 % sugar, 0.3 % stabilizer, 61.7 % water]
is about −2.5 °C, where with increasing sugar and MSNF
contents it decreases (−3 °C), while with rising fat or lowering
MSNF or sugar contents it will increase (−1.4 °C).
According to these rules, the freezing point of ice cream
mixes showed an inverse relation (r2=0.9482) with lactose
hydrolysis (−2.184 °C in control and −2.483 °C at LH
>75 %, i.e. 0.3 °C depression in freezing point) (Table 1).