Abstract
Ultrafiltration (UF) of buffalo skim milk (BSM) induces changes in its delicate protein-mineral equilibrium. Appling UF causes alteration in chemical composition of UF retentates as a function of protein concentration that adversely affect their physical and rheological properties. Hence, present investigation was targeted to evaluate the changes taking place in heat stability, ζ-potential, particle size, apparent viscosity, pH, turbidity and crossover temperature of storage (G′) and loss (G″) modulus of high-protein BSM based UF retentates as a function of homogenization and sodium hydrogen phosphate (SHP) addition. The UF of BSM (heat treated at 85 ± 1 °C for 5 min), significantly increased (P < 0.05) the concentration of protein, fat and minerals, however, it decreased the concentration of lactose and water soluble minerals in UF retentates over BSM. The SHP addition significantly increased (P < 0.05) pH, crossover temperature of G′ and G″, ζ-potential, while significantly decreased (P < 0.05) turbidity and particle size in most non-homogenized retentates. Heat coagulation time (HCT) of control and treated UF retentates were at par (P > 0.05) with each other, however, variations were observed in their viscosity values. Rheological behaviour of most of these UF retentates was efficiently described by Bingham model. The correlation among ζ-potential, particle size, apparent viscosity, pH, turbidity, HCT and crossover temperatures G′ and G″ of evaluated samples was also established. Overall, this study concluded that 0.5–6% SHP addition in non-homogenized UF retentates, markedly improved their milk protein stability as advocated by higher ζ-potential, G′ and G″ crossover temperature values.
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Acknowledgement
The director and Vice-Chancellor of the institute (ICAR-NDRI, Karnal) is thankfully acknowledged by all authors for funding IRC project No E-33 and also for providing fellowship to first author.
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This research has been conducted as a part of funding IRC project No E-33, funded by ICAR-NDRI Karnal, Haryana.
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HJU and GSM generated data and made the initial draft, YK and SGB did statistical and rheological analysis, NU performed chemical analysis while AKS and SA improved this MS on language and technical grounds.
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Uttamrao, H.J., Meena, G.S., Khetra, Y. et al. Homogenization and sodium hydrogen phosphate induced effect on physical and rheological properties of ultrafilterd concentrated milk. J Food Sci Technol 59, 956–967 (2022). https://doi.org/10.1007/s13197-021-05097-2
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DOI: https://doi.org/10.1007/s13197-021-05097-2