Microalgae Saccharification Without Cell Crushing for Ethanol Production
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Solution Overview
Problem
Existing methods for producing glucose and ethanol from microalgae that accumulate starch within their cells are inefficient and require energy-intensive or costly cell wall crushing processes, as well as prolonged maintenance in a dark and anaerobic atmosphere.
Innovation Solution
A method involving the use of microalgae with thin or partially damaged cell walls, allowing direct application of saccharifying enzymes to convert starch into glucose without crushing, followed by alcoholic fermentation to produce ethanol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mechanical crushing or chemical dissolution of cell walls is performed to access intracellular starch, then starch can be utilized for glucose production, but energy consumption increases and process complexity increases
Solution Approach 1:
The invention changes the physical parameter of cell wall thickness by using mutant microalgae with naturally thin or damaged cell walls. This parameter change allows saccharifying enzymes to access intracellular starch without requiring mechanical crushing or chemical dissolution, thereby eliminating energy-intensive cell wall breaking processes while maintaining effective starch utilization
Solution Approach 2:
The mutant microalgae inherently possess thin or damaged cell walls that automatically allow enzyme penetration without external intervention. The cell structure itself facilitates the desired function (enzyme access to starch) without requiring additional energy-consuming processing steps, making the system self-service in nature
2Ease of manufacture
If cell wall crushing process is implemented to access intracellular starch, then starch becomes accessible for saccharification, but manufacturing complexity and cost increase
Solution Approach 1:
By changing the cell wall thickness parameter through mutant strain selection, the invention eliminates the need for complex cell wall crushing equipment and processes. The naturally thin cell walls allow direct enzyme application, simplifying the overall manufacturing process while maintaining effective starch access
3Ease of manufacture
If slurry is maintained in dark and anaerobic atmosphere for several days to generate glucose, then glucose production occurs without cell wall crushing, but production time and process complexity increase
Solution Approach 1:
The invention performs preliminary action by pre-modifying the cell wall structure through mutant strain selection before the saccharification process. This preliminary change in cell wall permeability allows enzymes to immediately access starch upon addition, eliminating the need for prolonged dark and anaerobic maintenance periods and enabling rapid glucose production
Solution Approach 2:
The invention replaces the mechanical/time-intensive process of maintaining slurry in dark and anaerobic conditions with a direct enzymatic saccharification approach. By substituting the time-based glucose generation method with enzyme-catalyzed hydrolysis, the process achieves rapid glucose production without prolonged maintenance periods
4Productivity
If cell wall crushing process is performed to access intracellular starch, then starch becomes accessible, but overall process efficiency decreases
Solution Approach 1:
By changing the cell wall thickness parameter in mutant microalgae, the invention eliminates energy-consuming cell wall crushing processes while maintaining effective starch access. This parameter modification directly improves overall production efficiency by removing unnecessary energy expenditure in the production pathway
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
Enables efficient and easy production of glucose and ethanol by eliminating the need for cell wall crushing and anaerobic maintenance, facilitating outdoor cultivation and using waste CO2 as a nutrient, with high-concentration ethanol separation.
Implementation Method 1
a preparatory step of preparing microalgae in which a saccharifying enzyme acts on starch accumulated within cells thereof without a crushing process of cell walls being performed, and a saccharification step of saccharifying the starch within the cells to generate glucose by adding the saccharifying enzyme to the microalgae
Implementation Method 2
an ethanol production method, comprising a fermentation step of causing the glucose obtained by the above-described glucose production method to undergo alcoholic fermentation to thereby generate ethanol
Data Source
AI summary
The present invention can: efficiently and readily produce glucose from microalgae that accumulate starch in their cells; and obtain ethanol. During a preparation step of the glucose production method, microalgae are prepared on which a saccharifying enzyme acts on starch accumulated inside the microalgae cells, without disrupting the cell walls. In a saccharification step, starch inside the cells is saccharified and glucose is generated, by adding a saccharifying enzyme to the microalgae without a disruption treatment. The ethanol production method has a step in which, after the saccharification step, the glucose undergoes alcoholic fermentation and ethanol is generated.