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Molecules 2004, 9(7), 550-567; doi:10.3390/90700550

Polymeric Complexes of Cornstarch and Waxy Cornstarch Phosphates with Milk Casein and Their Performance as Biodegradable Materials

1
Department of Animal Product Technology, Agricultural University, Cracow, Poland
2
Department of Chemistry, Agricultural University, Mickiewicz Ave., 21, 31 120 Cracow, Poland
*
Author to whom correspondence should be addressed.
Received: 26 November 2003 / Revised: 15 March 2004 / Accepted: 16 March 2004 / Published: 30 June 2004
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Abstract

Complexes of phosphated cornstarch and waxy cornstarch with casein were prepared and characterised. They were prepared from casein in defatted milk and corn and waxy corn starches phosphated to degree of substitution values (DS) of 0.0637 and 0.0968, respectively. The components were blended in starch to casein ratios of 2:1, 1:1, and 1:2, then precipitated with hydrochloric acid. Aqueous solubility, water binding capacity, IR spectra, and thermal analysis (thermogravimetry, TG, and differential thermogravimetry, DTG) of the precipitates revealed that they were not simple physical mixtures of the components. The components interact with one another electrostatically with involvement of the starch phosphate groups and the peptide bonds of casein as documented by the IR spectra. Because of their insolubility in 7 M aqueous urea solution they might also be considered as complexes in which the components were chemically bound. Enzymatic studies showed that they are biodegradable materials.
Keywords: Anionic starch; biodegradable materials; intermolecular interactions; starch- casein complexes Anionic starch; biodegradable materials; intermolecular interactions; starch- casein complexes
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Najgebauer, D.; Grega, T.; Sady, M.; Tomasik, P. Polymeric Complexes of Cornstarch and Waxy Cornstarch Phosphates with Milk Casein and Their Performance as Biodegradable Materials. Molecules 2004, 9, 550-567.

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