In Situ Thermodielectric Analysis of the Gelatinization Mechanism of Raw Maize Starch: An Experimental and Theoretical Approach
- 23 Downloads
Raw maize starch, initially stored at ambient temperature and relative humidity, was examined by means of Broadband Dielectric Spectroscopy in the temperature range from 30 to 130 °C and in the frequency range from 0.1 Hz to 1 MHz. The α-relaxation processes of amylose and amylopectin were, for the first time, separately recorded and analyzed by employing the electric modulus formalism, while the gelatinization mechanism is discussed and modeled. Molecular dynamics analysis, conducted via the Vogel–Fulcher–Tammann equation, and the Debye and Cole–Cole dielectric function models were employed to further understand the gelatinization process and the dielectric behavior of amylose and amylopectin respectively. In addition, the transformation of V-amylose to free amylose was also observed and discussed.
KeywordsMaize starch Gelatinization process Broadband Dielectric Spectroscopy Electric modulus Molecular dynamics
The work reported here was supported by the Hungarian Scientific Research Fund (OTKA) through the project K 109409.
- 9.Zaikov GE (2005) Chemistry of polysaccharides. Nova Science Publishers, New YorkGoogle Scholar
- 10.Belitz HD, Grosch W, Schieberle P et al (2009) Food chemistry. Springer, BerlinGoogle Scholar
- 12.Xie F, Pollet E, Halley PJ, Avérous L (2013) Starch-based nano-biocomposites. Prog Polym Sci 38:1590–1628. https://doi.org/10.1016/j.progpolymsci.2013.05.002 CrossRefGoogle Scholar
- 15.Tester RF, Morrison WR (1990) Swelling and gelatinization of cereal starches. I. Effects of amylopectin, amylose, and lipids. Cereal Chem 67:551–557Google Scholar
- 16.Drakopoulos SX, Karger-Kocsis J, Kmetty Á et al (2017) Thermoplastic starch modified with microfibrillated cellulose and natural rubber latex: a broadband dielectric spectroscopy study. Carbohydr Polym 157:. https://doi.org/10.1016/j.carbpol.2016.10.036
- 33.Psarras GC (2010) Conductivity and dielectric characterization of polymer nanocomposites. In: Tjong SC, Mai Y-W (eds) Physical properties and applications of polymer nanocomposites, 1st edn. Elsevier, Amsterdam, pp 31–69Google Scholar
- 37.Miller LA, Gordon J, Davis EA (1991) Dielectric and thermal transition properties of chemically modified starches during heating. Cereal Chem 68:441–448Google Scholar
- 38.Venkatesh MS, Raghavan GSV (2004) An overview of microwave processing and dielectric properties of agri-food materials. Biosyst Eng 88:1–18. https://doi.org/10.1016/j.biosystemseng.2004.01.007 CrossRefGoogle Scholar