Résumé
The use of ion-exchange chromatography and P-31 nuclear magnetic resonance (P-31 NMR) to analyse the composition and the chain length of phosphate emulsifying salts were studied, as well as the impact of these salts in dairy products. Ion chromatography was more appropriate than P-31 NMR to study polyphosphate composition in complex environments, whereas interactions between phosphate species and dairy components were elucidated by P-31 NMR. Phosphate species interacting with calcium, as well as the percentage of chelated calcium, were identified using P-31 NMR. Thus, ion chromatography and solid-sate P-31 NMR could be used as complementary methods to study compositions of polyphosphate blends and their interactions with dairy matrices. (c) 2012 Elsevier Ltd. All rights reserved.