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.
Highlights
Agricultural economies are controlled by the markets for crops and the products from their processing
Crops are utilized for non-nutritional purposes, such an approach could intensify agricultural production by increasing the demand levels
Addition of hydrochloric acid to milk in which the sodium salt of potato starch phosphate was suspended resulted in precipitation of a solid material
Summary
Agricultural economies are controlled by the markets for crops and the products from their processing. Complexes of PPCS with casein dissolved in water at 60oC slightly better than non-complexed starch and this experimental solubility was higher than the theoretical one. Complexes of GPWCS and pasted PPWCS with casein were more water-soluble than the corresponding complexes with GPCS and PPCS.
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