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Effect of Microwave Treatment on Physicochemical Properties of Maize Flour

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Abstract

Relatively little work has been reported about flour changes during microwave irradiation. For this reason, maize flours were treated by microwave radiation at 400 W for 0.5, 1, 2 and 4 min, and their microstructure and physicochemical characteristics (X-ray diffractometry, differential scanning calorimetry and pasting properties) were analysed. Micrographs showed that maize flour treated by microwave radiation displayed less compacted particles and more swollen starch granules. Treated maize flours displayed higher V-type crystalline structure, indicating amylose-lipid complexes formation. Additionally, onset and peak temperature and gelatinization enthalpy increased when increasing treatment time of samples. Maize flours subjected to mild treatment (0.5 and 1 min) showed higher peak viscosity and breakdown than native maize flour, and maize samples subjected to severe treatments (2 and 4 min) displayed a lower peak viscosity and breakdown, which reflects an increase in shear stability, with respect to native maize sample. In general, microwave treatment fostered changes in starch crystallinity and the formation of amylose-lipid complexes affecting the functional properties of flour such as its pasting behaviour and its thermal properties.

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Acknowledgments

This study was supported financially by Junta de Castilla y León (VA054A12-2), Spain. The authors are also grateful to Spanish Education Ministry for the research fellowship of Laura Román. Mario M. Martínez would like to thank predoctoral fellowship from University of Valladolid.

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Authors and Affiliations

  1. Food Technology Area, College of Agricultural Engineering, University of Valladolid, 34004, Palencia, Spain

    Laura Román, Mario M. Martínez & Manuel Gómez

  2. Institute of Agrochemistry and Food Technology (IATA-CSIC), Avda Agustin Escardino, 7, 46980, Paterna, Spain

    Cristina M. Rosell

Authors
  1. Laura Román
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  2. Mario M. Martínez
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  3. Cristina M. Rosell
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  4. Manuel Gómez
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Correspondence to Manuel Gómez.

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Román, L., Martínez, M.M., Rosell, C.M. et al. Effect of Microwave Treatment on Physicochemical Properties of Maize Flour. Food Bioprocess Technol 8, 1330–1335 (2015). https://doi.org/10.1007/s11947-015-1493-0

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  • DOI: https://doi.org/10.1007/s11947-015-1493-0

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