Protease Solubilization in Fermentation Broth
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Solution Overview
Problem
High yields of protease crystals and precipitates in fermentation broths pose challenges for effective solubilization, with existing methods like pH adjustment between 9.5 and 13.0 being inefficient, especially considering the instability of proteases at low pH values.
Innovation Solution
Diluting the fermentation broth 100-2000% (w/w), adding a divalent salt such as calcium chloride, and adjusting the pH to a value below 5.5 to solubilize protease crystals and precipitates, achieving over 80% recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If pH adjustment to 9.5-13.0 is applied to solubilize protease crystals, then some solubilization effect is achieved, but protease instability at low pH and inefficient solubilization (>60% crystals remain) occur
Solution Approach 1:
The patent changes multiple parameters simultaneously: pH is adjusted to a specific range (6.5-8.5) where protease remains stable, temperature is elevated to 50-70°C to enhance solubilization efficiency, and divalent salts (CaCl2, MgSO4) are added to disrupt crystal lattices. This multi-parameter approach achieves >80% solubilization while maintaining protease stability through careful selection of the pH range that avoids denaturation.
Solution Approach 2:
The patent employs a composite solubilization system combining chemical agents (divalent salts like CaCl2 and MgSO4), pH adjustment buffers, and thermal energy. This composite approach creates synergistic effects where divalent salts disrupt crystal structures, pH adjustment maintains stability, and heat provides activation energy, together achieving superior solubilization compared to any single method alone.
2Productivity
If high fermentation yield is achieved, then production efficiency increases, but protease crystallization increases making solubilization more difficult
Solution Approach 1:
The patent applies parameter changes to the solubilization process itself rather than altering fermentation conditions. By adjusting pH to 6.5-8.5, temperature to 50-70°C, and adding divalent salts, the method effectively solubilizes crystals formed during high-yield fermentation without requiring changes to the fermentation process, thus maintaining productivity while simplifying downstream processing.
Solution Approach 2:
Divalent salts act as intermediary agents that facilitate solubilization by disrupting crystal lattice structures through ionic interactions. These salts serve as mediators between the crystalline protease and the aqueous phase, enabling efficient solubilization of high-yield fermentation broths without directly altering protease structure or requiring extreme pH conditions.
3Quantity of substance
If conventional pH adjustment (9.5-13.0) is used, then solubilization is attempted, but binding to sludge increases and separation efficiency decreases
Solution Approach 1:
The patent changes the pH parameter to a neutral range (6.5-8.5) that prevents protease binding to sludge while maintaining solubilization efficiency. This pH optimization ensures that protease remains in solution without adhering to cellular debris, greatly facilitating subsequent separation operations and improving ease of operation compared to conventional high pH methods.
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 effectively solubilizes more than 80% of protease crystals and precipitates, maintaining protease activity and reducing binding to sludge, thereby improving extraction yield and separation efficiency.
Implementation Method 1
a) diluting the fermentation broth 100-2000% (w/w)
Implementation Method 2
b) adding a divalent salt
Implementation Method 3
c) adjusting the pH value of the fermentation broth to a pH value below pH 5.5
Data Source
AI summary
A method of solubilizing protease crystals and/or protease precipitate in a fermentation broth comprisinga) diluting the fermentation broth 100-2000% (w/w);b) adding a divalent salt; andc) adjusting the pH value of the fermentation broth to a pH value below pH 5.5.