3.4 Fat agglomeration
A comparison of the particle size distributions in ice cream mix and ice cream is
presented in Table 3. No significant difference (P>0.05) was found in the extent of
homogenization (d4,3 mix values) for mixes with either no stabilizer or the CMC/guar
combination, with d4,3 values all <1 μm. A range of fat globule diameter (d4,3) in the
ice cream mix has been reported to be 0.04–4.0 μm (Caillet et al. 2003). However, the
addition of BSG had a significant impact on the colloidal particle size distribution in
the mix, resulting in substantially larger values at either 0.1% or 0.2% BSG compared
to the commercial gums. To understand these values, solutions of either 0.2% BSG or
0.2% BSG, 15% sugar, and 11% skim milk powder were heated and homogenized
under similar mix processing conditions, and they showed a large peak with a d4,3
value of 167 and 81 μm, respectively. This indicates that BSG itself was forming
large aggregates; consequently, the size distributions reported in Table 3 for mixes do
not solely represent fat globules. Hence, further comparisons are difficult.
(a)
(b)
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