| dc.description.abstract | Ultrasonication was applied to Ganyong (Canna edulis Ker) starch for three
treatment of times (15, 30, and 45 minutes) at controlled temperature (30⁰, 45⁰, and
60⁰C). Ganyong as a local indigenous plant was chosen as the material in this study
because it has big potential to produce resistant starch from its high content of
amylose compared to other tuber’s starch, such as cassava, sweet potato, yam and
arrowroot. Ultrasonication at 60⁰C and 45 minute was chosen as best treatment
combination in this study due to the highest yield of resistant starch produced.
Native canna starch was observed to have 1.45±0.24 % of resistant starch, however
the number significantly increased to 48.19 ± 0.84% of resistant starch after
modification (p<0.05). Further physicochemical changes of native and modified
starch were observed. The results showed that there were no significant changes in
the proximate analysis profiles before and after treatment. However, the
ultrasonication significantly influence the pasting profiles (p<0.05) which was also
expected due to the increase of starch granule size range from 30-160 μm to 45-179
μm after modification. The morphological changes were clearly observed by SEM
and PLM, which showed swollen granule with rougher surface and fissures after
modification. Thermal analysis using DSC did not significantly influenced the
gelatinization temperature of the granule starch, however the increase of enthalpy
(ΔH) occured from 2.99 to 10.86 J/kg. This result indicated the increase of resistant
starch within canna starch granule. | id |
