Protein Separation from Phenolics via pH and Ionic Strength Control
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Solution Overview
Problem
Current membrane filtration technologies, such as ultrafiltration and diafiltration, are not cost-efficient for separating proteins and phenolic compounds from plant extracts due to the tendency of phenolic compounds to adhere to proteins and membrane fouling, leading to low selectivity and short membrane lifetime.
Innovation Solution
A method involving cross-flow membrane filtration followed by diafiltration with increased ionic strength and pH control, allowing phenolic compounds to permeate while retaining proteins, and subsequent recycling of salts to enhance permeability and reduce fouling, thereby isolating phenolic compounds in a purified state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional membrane filtration (ultrafiltration and diafiltration) is used to separate proteins from phenolic compounds, then proteins can be separated from low molecular weight compounds, but phenolic compounds adhere to proteins and membranes causing fouling, reducing selectivity and membrane lifetime
Solution Approach 1:
The patent applies parameter changes by adjusting pH to specific ranges (acidic pH 2-4 or alkaline pH 8-10) and controlling ionic strength (0.01-0.5 M) to modify the electrostatic interactions between phenolic compounds, proteins, and membrane surfaces. This reduces adsorption of phenolics to membranes and proteins, thereby reducing fouling and extending membrane lifetime while maintaining separation selectivity
Solution Approach 2:
The patent uses salts (such as sodium chloride, potassium chloride, ammonium chloride) as intermediary substances to control ionic strength and mediate interactions between phenolic compounds, proteins, and membrane surfaces. The salts act as a mediator to reduce direct adsorption between phenolics and membrane, thereby reducing fouling without compromising separation efficiency
2Manufacturing precision
If conventional membrane filtration is used for protein-phenolic separation, then separation can be achieved, but the process is not cost-efficient due to membrane fouling and short lifetime
Solution Approach 1:
By optimizing pH and ionic strength parameters, the patent reduces membrane fouling and extends membrane lifetime, thereby reducing replacement costs and improving process cost-efficiency while maintaining separation efficiency
Solution Approach 2:
The patent implements a recycling system where salts and water are recovered from the permeate and reused in the diafiltration process. This reduces waste disposal costs and water/salt consumption, improving overall process cost-efficiency while maintaining separation performance
3Manufacturing precision
If diafiltration is performed with water to remove salts and low molecular weight compounds, then purification is achieved, but phenolic compounds remain in the retentate and membrane fouling increases
Solution Approach 1:
The patent changes the composition of the diafiltration solution from pure water to solutions with controlled ionic strength (0.01-0.5 M) and specific pH values. This prevents phenolic compounds from adsorbing to the membrane surface during diafiltration, thereby reducing fouling while maintaining purification effectiveness
Solution Approach 2:
The patent introduces salts as intermediary substances in the diafiltration solution to control ionic strength and mediate interactions between phenolic compounds, proteins, and membrane surfaces. This reduces direct adsorption of phenolics to the membrane, thereby reducing fouling while maintaining the purification function
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
This approach improves the efficiency and cost-effectiveness of protein and phenolic compound separation by increasing permeate flux and reducing membrane fouling, allowing for the isolation of high-value phenolic compounds and recycling of salts, thus minimizing water and salt usage.
Implementation Method 1
Subjecting said liquid to a first cross-flow membrane filtration process wherein the one or more first salts and at least a portion of the phenolic compounds migrate across the membrane into a first permeate and the proteins are retained in a first retentate
Implementation Method 2
Adding water, or one or more second salts and water, to the retentate while continuing the membrane filtration process to create a diafiltrate containing at least a portion of said phenolic compounds and the added second salts
Data Source
AI summary
A method for separation of proteins, particularly plant proteins, from salts and phenolic compounds in a liquid comprising said proteins dissolved in said liquid is provided. The method includes a step of subjecting said liquid to a first cross-flow membrane filtration process wherein the first salts and at least a portion of the phenolic compounds migrate across the membrane into a first permeate and the proteins are retained in a first retentate; followed by a step of adding water, or one or more second salts and water to the first retentate, while continuing the membrane filtration process, to create a diafiltrate containing at least a portion of said phenolic compounds and the added second salts.