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Effects of heat–moisture treatment on organic cassava starch

Thermal, rheological and structural study

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Abstract

Organic foods and crops are produced throughout the world under strict controls on growing conditions, so that synthetic chemicals, irradiation or genetic modifications are avoided. Organic starch is extracted following the same rules. Heat–moisture treatment (HMT) on starch is a physical method considered to be natural: it consists of heating starch at a temperature above its gelatinisation point with insufficient moisture (<35 %) to cause gelatinisation. Samples of organic cassava starch (with 12.8 % moisture) were dried in an oven with forced air circulation at 50 °C for 48 h and, immediately, distilled water was added to each sample until it reached the ratios of 10, 20, and 30 %, respectively. The samples were transferred into 100 mL pressure flasks, sealed tightly with a cap, and maintained in an autoclave for 60 min at 120 °C. The flasks were opened and the samples were kept in a desiccator containing anhydrous calcium chloride up to constant mass. The effects of HMT were studied using the following techniques: thermogravimetry and derivative thermogravimetry (TG/DTG), differential scanning calorimetry (DSC), rapid viscoamylographic analysis (RVA), reflectance photocolorimetry, atomic force microscopy (NC-AFM) and X-ray diffractometry (XRD). Rheological properties such as the pasting temperature (RVA) and the peak temperature (DSC) increased, while gelatinisation enthalpy ∆H (DSC) decreased. The average diameters of the granules showed no significant changes, while the degree of relative crystallinity decreased.

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Acknowledgements

The financial resources for this study were provided by the Fundação Araucária, PR, Brazil, the FINEP-Brazil, CAPES-Brazil and the CNPq-Brazil, whom the authors gratefully acknowledge.

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Authors and Affiliations

  1. Ponta Grossa State University, Av. Carlos Cavalcanti, 4748, Ponta Grossa, PR, 84030-900, Brazil

    Marina Morena Pereira Andrade, Cristina Soltovski de Oliveira, Tiago André Denck Colman & Egon Schnitzler

  2. Federal University of Paraná, Curitiba, PR, Brazil

    Fernanda Janaína Oliveira Gomes da Costa

Authors
  1. Marina Morena Pereira Andrade
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  2. Cristina Soltovski de Oliveira
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  3. Tiago André Denck Colman
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  4. Fernanda Janaína Oliveira Gomes da Costa
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  5. Egon Schnitzler
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Correspondence to Egon Schnitzler.

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Andrade, M.M.P., de Oliveira, C.S., Colman, T.A.D. et al. Effects of heat–moisture treatment on organic cassava starch. J Therm Anal Calorim 115, 2115–2122 (2014). https://doi.org/10.1007/s10973-013-3159-3

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  • DOI: https://doi.org/10.1007/s10973-013-3159-3

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