Fiber Yeast Immobilization Medium for Reusable Ethanol Fermentation
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Solution Overview
Problem
Existing yeast immobilization methods face challenges such as low mechanical strength, toxicity, and poor mass transfer in embedding methods, and limited reuse in adsorption methods, leading to inefficient ethanol fermentation and long fermentation times.
Innovation Solution
A novel yeast cell surface immobilization medium using a fiber material, treated with a surface modifier and cross-linking agent, attached to a supporting framework, which provides stable, non-toxic, and high-density cell immobilization with excellent mass transfer properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If embedding method using natural carriers is used, then immobilization density is improved, but mechanical strength deteriorates
Solution Approach 1:
The invention uses composite materials by combining fiber materials (such as cotton, wool, silk, or synthetic fibers) with cross-linking agents to create an immobilization carrier that integrates the high immobilization density capability of natural carriers with the mechanical strength of synthesized materials. The fiber material provides a three-dimensional network structure for high cell immobilization density, while the cross-linking agent strengthens the material structure to improve mechanical strength and resistance to microbial decomposition.
2Strength
If embedding method using synthetic organic polymer carriers is used, then mechanical strength is improved, but cell activity deteriorates
Solution Approach 1:
The invention changes the chemical parameters of the carrier material by using cross-linking agents with specific functional groups (aldehyde, carboxyl, hydroxyl, or amino groups) that can form gentle cross-linking structures. This allows the material to achieve high mechanical strength and stability while maintaining biocompatibility and avoiding the harsh conditions that would harm cell activity. The cross-linking density and type can be adjusted to optimize both mechanical properties and cell viability.
3Ease of operation
If adsorption method is used, then ease of operation is improved, but reusability deteriorates
Solution Approach 1:
The invention applies preliminary action by pre-treating the fiber material with cross-linking agents to create stable binding sites on the fiber surface before yeast cell immobilization. This pre-modification ensures strong and stable adsorption of yeast cells, allowing the carrier to be reused multiple times without significant loss of immobilization capability. The cross-linked fiber material maintains its adsorption capacity and structural integrity over repeated use cycles.
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 results in stable and efficient ethanol production with reduced energy consumption, shorter fermentation times, and improved yeast tolerance, achieving high cell density and catalytic efficiency while maintaining cell health and reducing separation costs.
Implementation Method 1
The adsorption method utilizes the adsorbability of microorganism to a solid surface or the surface of other cells to make it adsorbed to the surface of water-insoluble carriers and thereby immobilized
Implementation Method 2
Soaking the fiber material in a cross-linking agent aqueous solution at a concentration of 1-100 g/L
Implementation Method 3
a method of producing ethanol by using the yeast cell immobilization medium
Data Source
AI summary
Provided is a preparation method of a yeast cell immobilization medium, which comprises the following steps: (1) boiling a fiber material in boiling water and drying the fiber material; (2) soaking the fiber material in a surface modified aqueous solution with a concentration of 1-100 g/L, using hydrochloric acid to adjust a PH of the solution to 7.0, fully rinsing the fiber material in deionized water and drying the fiber material; (3) soaking the fiber material in a cross-linking agent aqueous solution with a concentration of 1-100 g/L, fully rinsing the fiber material in deionized water and drying the fiber material; and (4) attaching the fiber material to supporting framework. Also provided is the yeast cell immobilization medium prepared using the preparation method and a method for producing ethanol using the yeast cell immobilization medium.