Statistical analysis showed a significant effect of Actilight (0e6%)
onyield stress. Nosignificant difference onyield stresswas observed
between Actilight (6%) and sucrose (8%). In otherwords it can be said
that 6% Actilight showed similar yield stress values to 8% sucrose.
Similar findings were reported by Guggisberg et al. (2009a) with
inulin addition (0e4%) tolow-fat or whole milk yoghurt at a constant
protein level. Paseephol, Small, and Sherkat (2008) also reported
firmness values for low-fat yoghurts with a 4.1% protein content
which were affected significantly by the chain-length of inulins (4%,
either oligofructose, medium- or long-chain inulin). In agreement
with Guggisberg et al. (2009a), the addition of Actilight showed
similar rheological behaviour to the addition of inulin, but inulin is
believed to form a second network of submicron crystalline particles
that enclose large amounts ofwater, according to Frank (2002). Only
the longer inulin molecules participate in gel formation, while
smaller molecules remain dissolved, show humectant properties
and reduce water activity. In fact, short-chain inulin or Actilight
possess technological properties that are closely related to those of
sucrose. No significant difference was found between the test
samples with 8% sucrose and 8% of isomaltulose at both fat levels.
Statistical analysis showed barely no significant effect (P¼ 0.052)
of Actilight (0e6%) on compression force F35mm. Very similar
results were achieved for 6% of Actilight and isomaltulose (8%) or
sucrose (8%) and no significant difference between the addition of 8%
of sucrose or 8% of isomaltulose was observed.