Enzyme Microfiltration Using Cationic Surfactant
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Solution Overview
Problem
High-concentration enzyme solutions face challenges in microfiltration due to reduced permeability and flux, leading to inefficient enzyme recovery and purification, particularly with high protein concentrations and viscosity issues in fermentation liquors.
Innovation Solution
The process involves adding a cationic surfactant at 0.01 to 1% (w/v) to the enzyme-containing solution before microfiltration, using a microfiltration membrane with a sweeping stream, and subsequent ultrafiltration to separate and concentrate the enzymes, optimizing the transmembrane pressure and flow rates to enhance enzyme permeability and flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sweeping stream is flowed on the membrane during filtration, then membrane clogging is suppressed, but pressure loss increases and filtration pressure consolidates insolubles on the membrane
Solution Approach 1:
The patent changes the physical-chemical parameters of the fermentation liquor by adding a cationic surfactant, which modifies the interaction between particles and the membrane surface. This chemical modification allows the sweeping stream to be effective at lower flow rates, reducing pressure loss while still preventing membrane clogging and maintaining filtration efficiency.
2Stress or pressure
If a cationic high-molecular aggregating agent is added to reduce viscosity, then pressure loss is suppressed, but the membrane is clogged with the cationic polymer during repeated use
Solution Approach 1:
The patent employs a cationic surfactant with relatively low molecular weight compared to high-molecular aggregating agents. This shorter-living, more easily removable surfactant reduces viscosity effectively during filtration but does not permanently clog the membrane, allowing for membrane recovery and reuse without the accumulation issues associated with high-molecular polymers.
3Quantity of substance
If filtration is performed on high-concentration enzyme solution, then enzyme recovery is achieved, but permeability and flux are reduced
Solution Approach 1:
The cationic surfactant acts as an intermediary substance that mediates between the high-concentration enzyme solution and the filtration membrane. It modifies the surface properties and particle interactions, allowing the membrane to maintain higher permeability and flux even when processing concentrated enzyme solutions that would otherwise cause rapid clogging and flux reduction.
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 method significantly improves enzyme permeability and permeation flux, leading to more efficient enzyme recovery and purification, even at high protein concentrations, by reducing viscosity and preventing membrane clogging.
Implementation Method 1
adding a cationic surfactant in an amount of 0.01 to 1% (w/v) to an enzyme-containing solution... reducing viscosity and preventing membrane clogging
Implementation Method 2
microfiltering the enzyme-containing solution... separating microbial cells from a fermentation culture
Implementation Method 3
purifying and concentrating the resulting enzyme-containing solution by ultrafiltration
Data Source
Figure 1
AI summary
The present invention provides a process for producing an enzyme, which includes recovering an enzyme by microfiltering an enzyme-containing solution, having a cell density of 1% (v/v) or less and an enzyme concentration of 1% (w/v) or more in terms of the amount of proteins, with a cationic surfactant added in an amount of 0.01 to 1% (w/v) to the enzyme-containing solution.