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Alteration in physicochemical, functional, rheological and reconstitution properties of milk protein concentrate powder by pH, homogenization and diafiltration

Meena, Ganga Sahay, Singh, Ashish Kumar, Gupta, Vijay Kumar, Borad, Sanket Girdharbhai, Arora, Sumit, Tomar, Sudhir Kumar
Journal of food science and technology 2019 v.56 no.3 pp. 1622-1630
binding capacity, buffer index, calcium, cost effectiveness, dispersibility, emulsifying, foaming, heat stability, homogenization, milk protein concentrate, milk proteins, models, novel foods, pH, powders, protein content, rheological properties, scanning electron microscopy, sodium chloride, sodium phosphate, solubility, storage time, ultrafiltration, wettability
Concentration of milk proteins by ultrafiltration (UF) and diafiltration (DF) processes during manufacturing of milk protein concentrate (MPC) powders alter their natural milk protein stabilization system. Increasing calcium and protein contents often leads to poor functional properties in MPC powders. The pH adjustment using disodium phosphate (DSP, Na₂HPO₄) and DF with 150 mM NaCl solution of UF retentate were hypothesized to produce desirable changes in various properties of resulted MPC powders. Addition of Na₂HPO₄ followed by homogenization; DF of 5 × UF retentate with 150 mM NaCl solution resulted in significant improvement in the dispersibility, wettability, flowability, solubility, heat stability, buffer index, emulsification and foaming and water and oil binding capacities of the MPC powders. The solubility of developed MPC powders was significantly higher than MPC-C powder in fresh as well as even after 90 days of storage at 25 ± 1 °C. Rheological behaviour of reconstituted MPC was best explained by Herschel Bulkley model. Scanning electron microscopy micrograph indicated that MPC powders were having smooth surfaced, intact and separate smaller particles compared to rough, larger, infused aggregates with dents in MPC-C. Technological interventions applied are easier to adopt, cost-effective and efficient in producing excellent quality MPC powders that may find applications in wide range of novel food formulations.