Thixotropic α-Lactalbumin Hydrogels via pH and Ionic Strength Control
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Solution Overview
Problem
Current methods for preparing hydrogels from α-lactalbumin do not produce thixotropic gels, which are desirable for applications requiring reversible structural changes in response to stress, such as in food texturing, wound healing, and 3D cell culture, due to limitations in pH and ionic strength conditions.
Innovation Solution
A process involving suspending α-lactalbumin in an acidic aqueous solution with controlled ionic strength and pH, followed by stirring at specific temperatures to form thixotropic hydrogels with a yield point, allowing the gels to become destructured under shear stress and restructure upon cessation, characterized by a critical strain greater than 0.1.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional methods are used to prepare hydrogels from α-lactalbumin, then the gels can be formed, but they do not exhibit thixotropic behavior which is required for applications needing reversible structural changes
Solution Approach 1:
The patent applies parameter changes by precisely controlling pH (adjusting to specific ranges) and ionic strength (using specific salt concentrations) to transform α-lactalbumin into thixotropic hydrogels. This resolves the contradiction by modifying chemical parameters to achieve both thixotropic adaptability and structural reliability simultaneously
Solution Approach 2:
The patent utilizes phase transitions by inducing sol-gel transition in α-lactalbumin solutions under controlled conditions. The hydrogels exhibit reversible transitions between gel and liquid states under stress, achieving thixotropic behavior while maintaining structural integrity through controlled phase change
2Adaptability or versatility
If α-lactalbumin is suspended in acidic aqueous solution with controlled ionic strength and pH, then thixotropic hydrogels with yield point are formed, but the preparation process becomes more complex
Solution Approach 1:
The patent uses parameter changes by defining specific pH ranges and ionic strength values to achieve thixotropic gelation. While this adds preparation steps, it provides precise control over gel properties, resolving the contradiction between achieving complex thixotropic behavior and maintaining simple preparation
Solution Approach 2:
The patent applies self-service by allowing α-lactalbumin to self-assemble into thixotropic hydrogels under controlled conditions without requiring additional crosslinking agents or complex processing. The protein spontaneously forms the desired structure when exposed to the right pH and ionic strength, reducing overall process complexity
3Quantity of substance
If α-lactalbumin is used as a by-product from cheese industry, then the material is naturally abundant and cost-effective, but the purity and consistency of the protein may vary
Solution Approach 1:
The patent uses parameter changes by optimizing pH and ionic strength conditions to ensure consistent thixotropic gelation regardless of variations in raw material quality. This resolves the contradiction by making the process robust to variations in protein source while maintaining product consistency
Solution Approach 2:
The patent creates a porous hydrogel network structure that can accommodate variations in protein composition. The self-assembled network forms consistent structural properties even when starting with varying purity levels of α-lactalbumin from different cheese industry sources
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 resulting α-lactalbumin hydrogels exhibit stable thixotropic behavior, suitable for various applications including food texturing, wound healing, and industrial paints, with enhanced stability and ease of application, while being environmentally friendly and biocompatible.
Implementation Method 1
The protein used to produce the hydrogels is α-lactalbumin... suspending the α-lactalbumin in an acidic aqueous solution... forming the gel from said α-lactalbumin suspension
Implementation Method 2
forming the gel from said α-lactalbumin suspension obtained at the end of step a)... The resulting α-lactalbumin hydrogels exhibit stable thixotropic behavior
Implementation Method 3
they are thixotropic gels capable, under a sufficient stress, of becoming destructured until they are in a liquid state and then of becoming restructured once left to stand
Implementation Method 4
suspending the α-lactalbumin in an acidic aqueous solution having an ionic strength of less than or equal to 60 mM... adjusting the pH to a value of between 1.5 and 2.5... forming the gel from said α-lactalbumin suspension
Data Source
AI summary
The present invention relates to shear-thinning α-lactalbumin hydrogels, which have a threshold and are thixotropic, to a method for preparing same and to the use thereof.