The lowest (P < 0.05) half-life was obtained at the highest
temperature, 98C, which means that in this temperature and
above, the sample with anthocyanins cannot be processed or
heated for more than 2 h. Figure 4 shows that sample encapsulatedwithMDandGArecorded
the longest (P < 0.05) halflife
value at 60 and 80C. Similar values have been reported by
Mourtzinos et al. (2008) for the degradation of roselle anthocyanins
in the presence of b-cyclodextrin at 60 and 80C, i.e.,
38.5 and 7.22 h for half-life values.
It could be suggested that combination ofMDandGAmay
provide better protection for the encapsulated pigments
(roselle anthocyanins) due to high intermolecular interaction.
According to Gaonkar and McPhearson (2006), starch
and hydrocolloid (gum) interactions are often considered
synergistic. This indicated that selected encapsulating agent
could improve the stability of anthocyanins in aqueous solution
(pH 3) at several thermal temperatures.