Abstract
This work focused on the study of the physicochemical properties of nixtamalized corn and sorghum flours, as well as combined nixtamalized corn–sorghum flours with 10, 20, and 30 % of sorghum. The removal of the sorghum pericarp during nixtamalization depends on the steeping time and strongly influences the water and calcium uptake. The absence of the waxy layer in sorghum grain allows a faster water uptake in relation to corn grain. Changes in the pericarp structure during the steeping time govern the Ca absorption in sorghum grain. The partial removal of the pericarp and the most external layers of the endosperm produce the decrease in phosphorous content for corn and sorghum. The Ca/P ratio of nixtamalized corn/sorghum flours is greater than 1 for steeping time up to 3 h. Therefore, this fact could help the increase of Ca in the daily diet. Amylopectin is the predominant macromolecule in both starches. The pasting profiles showed a decrease in peak viscosity when the sorghum fraction increases; this is due to increases in fiber.
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Acknowledgments
M. Contreras Padilla wants to thank CONACYT Mexico for the financial support of her Post-doctoral position at CFATA-UNAM. The Authors want to thank Dra. Beatriz Millan and M S Alicia del Real Lopez for their technical support.
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Hernández-Becerra, E., Gutierrez-Oñate, M.P., Martinez-Soto, G. et al. Physicochemical characterization of corn–sorghum nixtamalized flours as a function of the steeping time. Food Measure 10, 434–443 (2016). https://doi.org/10.1007/s11694-016-9322-3
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DOI: https://doi.org/10.1007/s11694-016-9322-3