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Optimization of β-casein stabilized nanoemulsions using experimental mixture design.
Patrick G Maher1, Mark A Fenelon, Yankun Zhou
1Teagasc Food Research Centre, Moorepark, Cork, Ireland.
Journal of Food Science
|March 16, 2012
Summary
Higher beta-casein content in nanoemulsion continuous phases increases viscosity and stability, while decreasing the glass transition temperature (Tg'). This research optimizes formulations for improved nanoemulsion stability.
Area of Science:
- Food science and technology
- Colloid and surface chemistry
- Materials science
Background:
- Nanoemulsions are crucial in food, pharmaceutical, and cosmetic industries.
- The stability of nanoemulsions is highly dependent on the properties of their continuous phase.
- Understanding the relationship between continuous phase composition and nanoemulsion stability is vital for product development.
Purpose of the Study:
- To investigate the impact of varying viscosity and glass transition temperature (Tg') of the continuous phase on nanoemulsion stability.
- To determine the optimal levels of beta-casein, lactose, and trehalose for desired continuous phase properties.
- To evaluate the effect of continuous phase composition on nanoemulsion characteristics like particle size and stability.
Main Methods:
- Formulations with varying concentrations of beta-casein, lactose, and trehalose were created using Design of Experiments (DOE).
- Key properties of the continuous phase, including glass transition temperature (Tg'), onset of ice-melting temperature (Tm'), and viscosity (μ), were measured.
- Beta-casein stabilized nanoemulsions were prepared using microfluidization, and their particle size and stability were analyzed.
Main Results:
- Increased beta-casein content significantly enhanced viscosity and Tm', while decreasing Tg'.
- A mixture DOE effectively predicted optimal levels of lactose and trehalose for targeted Tg' and viscosity.
- Higher beta-casein concentrations led to increased nanoemulsion viscosity, particle size, and significantly improved stability.
Conclusions:
- The viscosity and glass transition temperature (Tg') of the continuous phase are critical factors influencing nanoemulsion stability.
- Beta-casein content plays a significant role in modulating these properties and enhancing overall nanoemulsion stability.
- DOE is a valuable tool for optimizing continuous phase formulations to achieve desired nanoemulsion performance.
