Table 1 lists the results from the analysis of fat from the measurements of melt rate at 27±1 oC. It was observed that the volume of perilla oil increased of the samples, providing greater resistance to ice cream melting compared to the control (without perilla oil). The Melting rate of T4 (source of fat butter:perilla oil (25:75)) minimum, which shows that the dissolution rate of ice cream high. Compared with the T1 (control source of fat (butter 100%)) (0.9963, 0.9965 respectively) showed the melting rate may not depending on the type of fat. Incorporation of fat from butter and perilla oil into the formulations caused statistically non significant (p<0.05) differences in melting rate. Some studies measured melt rate of ice cream by physical methods (Guinard et al., 1997; Li et al., 1997; Roland et al., 1999). Some of these found increased fat content to delay melting (Roland et al., 1999). Contrary to that, Li et al. (1997) found a slower melt rate at lower fat contents (between 10% fat and 4% fat, no added bodying agents). However, all physical methods involved measuring drip through a mesh. Since there were differences in viscosity of the melted ice creams, between different fat and sugar levels this can very likely have influenced measurement of melt rate (Michael et al., 2005). According to Cruz et al. (2009), the melting time of ice cream is related to its stability after overrun and indicates the extent of the stabilization and partial coalescence of fat. Furthermore, an increase in coalesced fat provides greater resistance to flow of the liquid phase resulting in slower melting (Muse & Hartel, 2004)
การแปล กรุณารอสักครู่..