Journal
FOOD CHEMISTRY
Volume 367, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2021.130580
Keywords
Purple sweet potato; Resistant starch; Autoclaving; Pullulanase; Structure characterisation
Funding
- Basic scientific research projects of Jilin Academy of Agricultural Sciences [KYJF2021ZR022]
- Major science and technology projects in Jilin Province [20200502003NC]
- Innovation Team Project of Agricultural Science and Technology Innovation Project in Jilin Province [CXGC2017TD014]
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All three treatments were able to transform the starch crystalline structure from C-type to B-type, resulting in the formation of resistant starch from purple sweet potato. Resistant starch prepared via pullulanase-autoclaving combination treatment exhibited the highest gelatinisation enthalpy value and the greatest degree of overall thermal stability.
In order to determine the mechanisms underlying resistant starch formation, three treatments were used to prepare resistant starch from purple sweet potato. The resistant starch yield, amylose content, chain length distribution, thermal properties, and crystal structure were determined, and the results were compared with those of unmodified starch. Autoclaving, pullulanase, and pullulanase-autoclaving treatments significantly increased the resistant starch yield, amylose content, shorter amylopectin branch content, and gelatinisation temperatures of native purple sweet potato starch. Resistant starch prepared via pullulanase-autoclaving combination treatment exhibited the highest gelatinisation enthalpy value and the greatest degree of overall thermal stability. X-ray diffraction patterns and Fourier-transform infrared spectra analysis demonstrated that all three treatments transformed the starch crystalline structure from C-type to B-type, and no new groups were generated during the modification process; all the processes were only physical modifications.
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