Stable Oil-in-Water Emulsions with Metal Chelating Agents
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Solution Overview
Problem
Existing oil-in-water emulsions containing polyunsaturated fatty acids (PUFAs) face challenges in maintaining stability against physical and oxidative degradation, which affects their shelf life and usability.
Innovation Solution
A method is developed to create a stable oil-in-water emulsion by combining water and an emulsifier, adding PUFAs while mixing, and incorporating a metal chelating agent and antioxidant, with specific weight percentages and pH control, to enhance stability and prevent degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUFAs are incorporated into an oil-in-water emulsion, then the nutritional value and functional benefits are improved, but the emulsion becomes unstable and susceptible to oxidative degradation
Solution Approach 1:
Antioxidants (such as tocopherols, ascorbic acid, and rosemary extract) are introduced as intermediary substances that protect PUFAs from oxidative degradation. These antioxidants act as mediators between the PUFAs and oxygen, preventing direct oxidation reactions and maintaining emulsion stability over extended periods
Solution Approach 2:
The pH of the emulsion is controlled within a specific range (3.0-5.0) to optimize the stability of PUFAs and the effectiveness of antioxidants. This parameter change creates a chemical environment that minimizes oxidative degradation while maintaining emulsion integrity
2Duration of action of stationary object
If conventional emulsion formulations are used, then the formulation process is simple, but the shelf life is limited due to physical and chemical degradation
Solution Approach 1:
The emulsion employs a composite antioxidant system combining multiple antioxidants (tocopherols, ascorbic acid, rosemary extract) with specific emulsifiers and pH buffers. This composite formulation provides synergistic protection against degradation, extending shelf life to at least 5 months while maintaining a manageable formulation process
Solution Approach 2:
Antioxidants and pH control agents are incorporated into the emulsion formulation before the emulsion is used or stored. This preliminary action ensures that protective mechanisms are already in place to prevent oxidative degradation during storage and use, extending shelf life without requiring complex post-formulation treatments
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The emulsion achieves extended shelf life of at least 5 months, maintaining physical and chemical stability, and effectively protects PUFAs from oxidation, ensuring prolonged usability.
Implementation Method 1
adding to the oil-in-water emulsion a metal chelating agent
Implementation Method 2
adding to the oil-in-water emulsion a metal chelating agent and an antioxidant; effectively protects PUFAs from oxidation
Implementation Method 3
combining water and an emulsifier to provide an aqueous mixture; adding to the aqueous mixture a polyunsaturated fatty acid while mixing to provide an oil-in-water emulsion
Data Source
Figure 1
AI summary
The present invention relates to stable oil-in-water emulsions comprising a polyunsaturated fatty acid, an emulsifier, water, a metal chelating agent, and an antioxidant, and processes for preparing the stable oil-in-water emulsions. The stable oil-in-water emulsions are substantially free from coalescence, flocculation, Ostwald ripening, and creaming, for a period of at least five months at a temperature of about 4 °C.