The Influence of the Addition of Polyacrylic Hydrogel on the Content of Proteins, Minerals and Trace Elements in Milk Protein Solutions

Aleksandar Ž. Kostić¹, Mirjana B. Pešić^1*, Miroljub B. Barać¹, Sladjana P. Stanojević¹, Časlav M. Lačnjevac¹, Ognjen D. Maćej¹ and Mirjana D. Stojanović<sup>2

1</sup>Institute of Food Technology and Biochemistry, Department of Chemistry and Biochemistry, Faculty of Agriculture, University of Belgrade, Nemanjina 6, RS-11081 Belgrade, Serbia
²Institute for Technology of Nuclear and Other Mineral Raw Materials, ITNMS, Boulevard of Franchet d’Espèrey 86, RS-11000 Belgrade, Serbia

Article history:
Received April 16, 2013
Accepted October 25, 2013

Key words:
milk protein solutions, polyacrylic hydrogel, mineral content, trace element content

Summary:
Solutions of milk protein concentrate, whey protein concentrate and bovine serum albumin (BSA) were treated with polyacrylic hydrogel to establish whether the hydrogel could be used for decontamination of heavy metal ions from milk protein-based products. The obtained results indicated that swelling of hydrogel in these solutions had different effects on their mineral, trace element and total protein content. Total protein and phosphorus content increased in milk protein concentrate and whey protein concentrate solutions after swelling of hydrogel without changes in their protein compositions. On the other hand, the protein content in BSA solution decreased after swelling. The content of Na did not change in milk protein concentrate solution, whereas it significantly increased in whey protein concentrate solution after hydrogel swelling. The content of Ca and Mg was reduced after the swelling in milk protein concentrate and whey protein concentrate solutions for 20.3–63.4 %, depending on the analysed sample and the mineral. The content of Zn did not change during swelling, whereas the content of Fe, Cu, Mn, Ni and Pb significantly decreased after hydrogel swelling in all analysed samples. According to the obtained results, the addition of polyacrylic hydrogel to milk and whey protein concentrate solutions can significantly decrease the content of heavy metal ions without affecting their protein composition. Therefore, this work could be useful in developing a new technological process for heavy metal purification of milk protein-based products.

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