Abstract
Starches isolated from four ayocote bean varieties were modified by thermal treatment to determinate the effect of the treatment on the structural changes of ayocote bean starch. Scanning electron microscopy indicates that the starch granules have oval and round shapes, with heterogeneous sizes and fractures when the extraction method is used. The presence of new bands at 2850 and 1560 cm−1 in the FT-IR spectra showed that the thermal treatment of ayocote beans induced an interaction between the protein or lipid and the amylose or amylopectin, while the sharpest band at 3400 cm−1 indicated a dehydration process in the starch granule in addition to the presence of the band at 1260 cm−1, indicating the product of the retrogradation process. The thermal treatment reduced the crystallinity as well as short-range order. Raman spectroscopy revealed that acute changes occurred in the polysaccharide bonds after thermal treatment. This study showed that the thermal treatment affected the structural properties of ayocote bean starches, the interactions of the lipids and proteins with starch molecules and the retrogradation process of starch.
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Acknowledgements
The authors would like to acknowledge the Tecnológico Nacional de México for the financial support of project number 5938.16-P.A-P and the Autonomous University of Hidalgo State for their technical services during this study.
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Bernardino-Nicanor, A., Acosta-García, G., Güemes-Vera, N. et al. Fourier transform infrared and Raman spectroscopic study of the effect of the thermal treatment and extraction methods on the characteristics of ayocote bean starches. J Food Sci Technol 54, 933–943 (2017). https://doi.org/10.1007/s13197-016-2370-1
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DOI: https://doi.org/10.1007/s13197-016-2370-1