A remarkable difference between the profiles of the two cultivars
in this study is the presence of a ‘bump’ around 60 C in the
RVA profile during the cooling phase for Apache but not for Akteur
samples. This indicates formation of amyloseelipid (AMeL) complexes
have suggested
that in situ formed AMeL complexes act as junction zones in
a network between granules, and thus induce gelation. However,
the RVA profiles of flour from cv. Akteur contained no such ‘bump’
although both flour samples contained similar levels of FFAs.
studied the effect of the addition of glycerol
monostearate to a wheat starch suspension in the RVA. They reported
a similar ‘bump’ in the profile during cooling as seen here for
cv. Apache (Fig. 3B). Remarkably, no such ‘bump’ was observed
when the same amount of glycerol monostearate was added in the
form of pre-synthesized amorphous AMeL complexes as seen here for cv. Akteur (Fig. 3A). Even though
the complexes dissociate and set the glycerol monostearate free
during the heating phase , the liberation of the
lipid does not induce a viscosity increase comparable to that during
the cooling phase in the presence of uncomplexed glycerol monostearate.
The reasons for this observation remained unclear