High-Density Yarrowia Fermentation for Faster Single-Cell Protein Yield
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Solution Overview
Problem
Current single-cell protein production methods are inefficient and have low yield, making it difficult to meet the demands of large-scale applications, particularly due to long fermentation cycles and insufficient production capacity.
Innovation Solution
A method involving high-density fermentation using Yarrowia lipolytica strain with specific carbon and nitrogen sources, including acetic acid and ketone compounds, to promote rapid growth and synthesis of single-cell proteins, optimizing fermentation conditions to enhance production efficiency and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fermentation methods are used for single-cell protein production, then the process is simple to operate, but the fermentation cycle is long and production yield is low
Solution Approach 1:
The patent applies parameter changes by optimizing fermentation conditions including pH control (maintaining pH 6.5-7.5), temperature control (28-32°C), dissolved oxygen concentration (20-40%), and nutrient supplementation rates. These parameter optimizations enable high-density fermentation with cell densities reaching 100-200 g/L dry weight, significantly improving productivity while reducing fermentation cycle time from conventional 72-96 hours to 48-60 hours.
Solution Approach 2:
The patent implements preliminary action through a two-stage fermentation process: first stage (lag phase and exponential phase) focuses on rapid cell growth with optimized carbon-nitrogen ratios, and second stage (stationary phase) focuses on protein accumulation. This preliminary preparation of cells in the first stage enables faster entry into high-yield protein production in the second stage, reducing overall fermentation time while increasing yield.
2Productivity
If high-density fermentation is implemented to improve production efficiency, then yield increases, but process complexity increases
Solution Approach 1:
The patent implements feedback control through continuous monitoring and adjustment of key parameters: pH is monitored and adjusted using NaOH or HCl supplementation, dissolved oxygen is controlled via aeration rate adjustment (0.5-2.0 vvm), and nutrient concentrations are maintained through fed-batch supplementation. This feedback mechanism maintains optimal conditions for high-density fermentation without requiring overly complex equipment, achieving cell densities of 100-200 g/L with manageable process complexity.
Solution Approach 2:
The patent applies dynamics by transitioning from static batch fermentation to dynamic fed-batch fermentation. The process dynamically adjusts aeration rates, agitation speeds, nutrient supplementation rates, and pH control throughout the fermentation cycle. This dynamic approach enables the system to adapt to changing metabolic demands during different growth phases, improving productivity while keeping the fermentation tank and control systems relatively simple.
3Speed
If conventional carbon and nitrogen sources are used, then the process is cost-effective, but growth rate and protein synthesis rate are insufficient
Solution Approach 1:
The patent optimizes the carbon-nitrogen ratio as a key parameter, using glucose as carbon source (20-40 g/L) supplemented with acetic acid (10-20 g/L) and peptone as nitrogen source (10-20 g/L). This optimized ratio accelerates growth rate and protein synthesis rate significantly compared to conventional media, achieving cell densities of 100-200 g/L within 48-60 hours. The cost increase is moderate and offset by the dramatic improvement in productivity and reduced fermentation time.
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 significantly shortens fermentation time and improves the production efficiency and yield of single-cell proteins, allowing for higher crude protein content in a shorter period.
Implementation Method 1
A method involving high-density fermentation using Yarrowia lipolytica strain with specific carbon and nitrogen sources, including acetic acid and ketone compounds, to promote rapid growth and synthesis of single-cell proteins
Data Source
Figure 1~2
AI summary
Disclosed herein is a method for producing a single-cell protein by means of high-density fermentation. The method comprises: inoculating a Yarrowia lipolytica strain into a seed culture medium for seed culture to obtain a seed liquid; and inoculating the seed liquid into a fermentation culture medium for high-density fermentation, and supplementing same with acetic acid and a nitrogen source during the process of high-density fermentation to obtain the single-cell protein, wherein the carbon source of the seed culture medium comprises a first acetate, and the carbon source of the fermentation culture medium comprises a second acetate and/or a ketone compound. In the present application, the compounding of specific materials and processes effectively increases the growth rate of bacteria and the synthesis rate of single-cell proteins, so that the method can realize the high-density fermentation of bacteria and efficient synthesis of single-cell proteins in a short time, a fermentation product with a higher content of crude proteins can be obtained while the culture time of high-density fermentation is significantly shortened, and the production efficiency and yield of single-cell proteins are greatly improved.