Galactooligosaccharide Production via Microfiltration and Cell Recycling
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Solution Overview
Problem
Current methods for producing high purity galactooligosaccharides face challenges such as high costs due to the use of costly resins and inefficient downstream processing, mechanical instability of immobilized cell matrices, and low conversion efficiency, leading to yield losses and economic inefficiencies.
Innovation Solution
A process utilizing mixed whole cells of yeasts in a bioreactor with a microfiltration membrane system for the production of high purity galactooligosaccharides, eliminating the need for costly resins and optimizing the production through sequential reactor use and coimmobilization, followed by filtration and concentration steps to achieve high purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If immobilized cells are used in hydrocolloid matrices, then catalytic power is stabilized and cells can be recycled, but mechanical stability of the immobilized beads is poor
Solution Approach 1:
The patent uses a composite matrix system combining calcium alginate (provides mechanical strength and structural integrity) with polyvinyl alcohol (PVA) and borax (enhance mechanical stability and reduce swelling). This composite approach allows the immobilized cells to maintain both catalytic activity and mechanical robustness, resolving the contradiction between soft gel properties and mechanical stability.
2Productivity
If free whole cells are used for biotransformation, then conversion efficiency is high, but product separation from unreacted substrate and impurities is challenging
Solution Approach 1:
The patent extracts and removes cells from the reaction mixture through filtration after biotransformation is complete. This allows the reaction to proceed with free whole cells (maintaining high conversion efficiency) while easily separating cells from the product mixture (simplifying downstream processing). The cells can then be recovered and reused in subsequent batches.
Solution Approach 2:
The patent implements a cell recovery and reuse system where cells are discarded from the reaction mixture after use through filtration, then recovered and reused in subsequent biotransformation cycles. This maintains the high conversion efficiency of free cells while enabling easy separation and reuse, reducing overall process complexity.
3Manufacturing precision
If costly resins are used for purification, then high purity galactooligosaccharides are achieved, but production cost increases
Solution Approach 1:
The patent replaces expensive, reusable purification resins with disposable filtration systems (filter paper, membrane filters). While the filtration media are single-use rather than reusable, they are significantly cheaper than ion-exchange resins or other costly purification materials, thereby reducing overall production costs while achieving the required purity level for galactooligosaccharides.
4Ease of manufacture
If immobilized matrices are used, then cells can be recycled reducing cost, but constraints in diffusion of substrate and products reduce bioconversion efficiency
Solution Approach 1:
The patent implements continuous batch processing where cells are reused across multiple reaction cycles. After each batch, cells are filtered, washed, and immediately reused in the next batch without long-term immobilization. This maintains continuous productive action while avoiding the diffusion limitations of permanent immobilization matrices.
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 process achieves high purity (>90%) galactooligosaccharides production with improved yield and cost-effectiveness by reusing cell biomass in repeated cycles and using microfiltration, deep bed filtration, and vacuum evaporation, resulting in a cost-effective and efficient production method.
Implementation Method 1
separating galactooligosaccharides from microbial culture using microfiltration membrane system/centrifugation
Implementation Method 2
filtering said galactooligosaccharides using a deep bed filter with cotton and activated carbon
Implementation Method 3
concentrating galactooligosaccharides at the temperature range of 40-60° C. in vacuum evaporator
Implementation Method 4
separating galactooligosaccharides from microbial culture using microfiltration membrane system/centrifugation
Data Source
AI summary
The present invention deals with an improved process for the production of high yield of pure Galactooligosaccharides using microbial whole cells in a reactor with cross flow hollow fiber microfiltration system. The process is economical as cell biomass is used repeatedly and eliminated the need to carry out downstream processing for the removal of mono and disaccharides from the final product.