The starch granules became more concave and wrinkled during
heat processing (Fig. 3 BeD). At 70
C, starch granules did not show
noticeable swelling, whereas amylose continuously leached out to
cover starch granules and finally form lumps (Fig. 3D).
3.5. Pasting properties of native and partially gelatinized JFSS
Pasting properties of the JFSS are summarized in Table 2 and
compared with those of other starches previously reported. Even
though pasting properties, especially peak viscosity, depend on
experimental conditions such as solids content, direct comparison
of published data in Table 2 requires extreme caution. This
notwithstanding, some differences in the pasting properties of the
JFSS were observed compared to other starches. The pasting temperature
of the JFSS (64.2
C) was relatively low, just above that of
potato starch (63.0
C), whereas peak viscosity was relatively high
(3.8 Pa.s). Also, the final viscosity and setback of the JFSS were
significantly high (5.2 Pa.s and 2.4 Pa.s, respectively), suggesting
that the JFSS formed a highly viscous paste capable of forming a
solid gel network. The pasting temperature and peak viscosity of
partially gelatinized JFSS was slightly lower than that of the native
starch. However, the partially gelatinized JFSS had higher final
viscosity and setback values compared to those of the native
sample (Table 2). Pasting profile depicted in Fig. 4 might provide