Rehydration Dynamics of Dairy Protein Powders
Summary
The rehydration of dairy protein powders encompasses a sequence of interrelated phenomena by which dry powder particles transform into a homogeneous solution or dispersion. Initially, wettability governs water uptake at the particle surface, followed by swelling and dispersion as water penetrates the porous matrix. Subsequent solubilisation of proteins and lactose leads to complete dissolution or stable dispersion. Key factors influencing each stage include powder composition (protein content, lactose ratio), particle morphology (size, porosity, surface chemistry) and manufacturing history (drying conditions, agglomeration). The balance of hydrophobic and hydrophilic interactions, the state of casein micelles versus whey proteins, and the ionic environment dictate the rate and extent of rehydration. Technological interventions—such as controlled acidification, microstructural modification, or the use of micro- and nano-bubble pretreatments—have emerged to enhance functional performance. Understanding these dynamics is vital for applications ranging from infant nutrition to sports supplements and packaged beverages, where rapid and complete rehydration under variable conditions ensures product quality, shelf life and consumer acceptance.
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Rehydration Dynamics of Dairy Protein Powders publication trend
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Technical terms
Wettability: The capacity of powder surfaces to become enveloped by water during initial contact, critical for preventing surface‐dry layers.
Dispersibility: The ability of powder aggregates to separate into primary particles when immersed, influencing lump formation.
Solubility: The extent to which proteins and lactose dissolve to form a uniform solution, affecting clarity and mouthfeel.
Casein micelles: Spherical colloidal assemblies of casein proteins and calcium phosphate, whose dissociation underpins rehydration kinetics.
NMR relaxometry: A spectroscopic technique that measures molecular relaxation times to monitor water uptake and swelling dynamics in powders.
References
- Effective strategies for elevating the techno-functional properties of milk protein concentrate. Trends in Food Science & Technology (2023).
- Swelling of food powders: Kinetics measurement and quantification using NMR relaxometry. Food Hydrocolloids (2024).
- Application of micro- and nano-bubbles in spray drying of milk protein concentrates. Journal of Dairy Science (2022).
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