PHA Particle Size Control via Heat Treatment
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Solution Overview
Problem
Current methods for producing polyhydroxyalkanoates (PHAs) face challenges in achieving large average particle sizes, which are essential for efficient separation and collection, thereby increasing production costs.
Innovation Solution
A method involving the culture of PHA-producing microorganisms to achieve microbial bodies with an average cell size of 2 μm or more, followed by a heat treatment to increase the average particle size of PHA particles to 1.8 μm or more, optimizing particle size distribution for efficient separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If PHA particles are aggregated in cell disruption solution, then average particle size increases, but impurity removal becomes difficult and separation efficiency decreases
Solution Approach 1:
The invention applies preliminary action by increasing the average cell size of microbial bodies before cell disruption, which preconditions the PHA particle distribution. This preliminary structural adjustment ensures that after disruption, PHA particles are naturally distributed in a size range optimal for separation, avoiding the need for post-disruption aggregation that would compromise separation efficiency.
2Volume of moving object
If phaP1 gene is disrupted to increase PHA particle size, then average particle size increases, but PHA accumulation amount significantly decreases
Solution Approach 1:
The invention applies parameter changes by modifying the average cell size parameter of microbial bodies to 2 μm or more, rather than disrupting the phaP1 gene. This parameter adjustment in cell morphology leads to increased PHA particle size after disruption without affecting the phaP1 gene function, thereby maintaining high PHA accumulation amounts while achieving the desired particle size for efficient separation.
3Volume of moving object
If stress exposure is applied to aggregate PHA particles, then some aggregation occurs, but average particle size change is limited due to small cell size
Solution Approach 1:
The invention applies preliminary action by pre-increasing the average cell size before PHA accumulation and disruption. This preliminary structural preparation ensures that when cells are disrupted, the PHA particles inherit a size distribution that is already optimized for separation, eliminating the need for additional stress exposure treatments that would be ineffective on small cells.
Solution Approach 2:
The invention applies parameter changes by controlling the average cell size parameter to 2 μm or more, which fundamentally changes the scale at which PHA particles are formed and distributed. This parameter change in cell morphology directly translates to larger PHA particle sizes after disruption, achieving efficient separation without requiring post-culture stress 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 method effectively increases the average particle size of PHA particles, facilitating easier separation and collection, which reduces production costs and improves the industrial viability of PHA production.
Implementation Method 1
subjecting the microbial bodies to a heat treatment at a temperature higher than a temperature in the culturing to increase an average particle size of the polyhydroxyalkanoate particles
Data Source
AI summary
A polyhydroxyalkanoate-producing microorganism is cultured to obtain microbial bodies accumulating polyhydroxyalkanoate particles and having an average cell size of 2 μm or more. The microbial bodies are subjected to a heat treatment at a temperature higher than a temperature in the culturing to increase an average particle size of the polyhydroxyalkanoate particles in the microbial bodies. The resulting average particle size is equal to or greater than 1.8 μm and equal to or smaller than the average cell size. The microbial bodies subjected to the heat treatment can be disrupted to obtain a cell disruption solution. The PHA particles can be separated from an aqueous phase of the cell disruption solution.