3.2. Thermal behaviour of the bulk fat in presence of
Tween 80
In this section the effect of the addition of Tween 80 on
thermal behaviour of the bulk fat (specifically the shape of the
melting and crystallisation peaks, peak temperature and
enthalpy) will be discussed.
Figs. 7 and 8 show the thermal behaviour of the bulk fat
with the addition of increasing amounts of Tween 80. As can
be seen the general shape of the curves (i.e. two peaks) does not change with the addition of Tween 80. However,
increasing the ratio of Tween 80 to bulk fat, the exothermic
and endothermic energy of melting and crystallisation does
differ. As can be seen in Fig. 9 increasing the amount of Tween
80 decreased the amount of energy required to melt the fat
(linear R2 = 0.83 indicating a strong relationship between
Tween to bulk fat ratio and DH) and increased the amount
of energy released during crystallisation (linear R2 = 0.74
indicating a strong relationship between Tween to bulk fat
ratio and DH).