Alginate-Agar Inoculum Pellets for Microbial Culture Standardization
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Solution Overview
Problem
Current inoculum development processes for microorganisms are inefficient due to variability in yields, contamination risks, and challenges in maintaining consistency and accuracy in producing standardized inocula, leading to increased costs and time in producing microbe-based products.
Innovation Solution
The method involves producing standardized, high-concentration inocula by mixing alginate and agar to create a semi-viscous solution, combining it with a purified microorganism culture, and forming pellets in a cold CaCl2 solution with glycerol, which can be stored for extended periods, allowing for consistent and reproducible microorganism cultivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standardized reference cultures are used to produce inocula through dilution, then a predetermined quantity of microorganisms can be obtained, but the process is time-consuming and costly due to multiple transfer steps and variability in yields
Solution Approach 1:
The patent prepares and stores standardized inoculum pellets in advance containing known concentrations of microorganisms. These pre-prepared inocula eliminate the need for time-consuming dilution series and CFU counting during actual experiments, as the concentration is already determined and standardized in the stored pellets.
Solution Approach 2:
The patent creates multiple copies of standardized inoculum from a single reference culture by producing standardized pellets that can be stored and reused. This copying approach allows the same standardized inoculum to be used across multiple experiments without repeatedly performing time-consuming preparation steps.
2Quantity of substance
If multiple transfer steps are performed during inoculum development, then the volume of culture can be increased to desired levels, but variability in yields and productivity increases
Solution Approach 1:
The patent performs the volume expansion and standardization steps in advance when creating the inoculum pellets, rather than performing multiple transfers during the actual cultivation process. The pellets are prepared with precise concentrations beforehand, ensuring consistency when used in subsequent experiments.
Solution Approach 2:
The patent changes the physical state of the inoculum from liquid culture requiring multiple transfers to solid pellets that can be directly transferred. This parameter change (from liquid to solid form) eliminates the need for multiple dilution and transfer steps while maintaining precise control over microbial concentration.
3Quantity of substance
If inoculum is transferred through multiple vessels during development, then culture volume increases, but the risk of contamination by undesirable microorganisms increases
Solution Approach 1:
The patent performs the culture expansion and purification steps in advance when creating the standardized inoculum pellets. The pellets are prepared in controlled conditions and then stored, eliminating the need for multiple transfer operations during actual use, thereby preventing contamination opportunities.
Solution Approach 2:
The patent extracts the microorganisms from the liquid culture medium and incorporates them into solid pellets with cryoprotectant. This extraction and reformulation into a stable solid form removes the need for subsequent liquid handling and transfers that would expose the culture to contamination risks.
4Measurement precision
If dilution series are performed to determine CFU/mL, then the number of colony-forming units can be estimated, but measurement accuracy varies greatly due to extrapolation of small measurement errors
Solution Approach 1:
The patent performs the CFU determination and standardization in advance when creating the inoculum pellets. The concentration is established once during pellet preparation using standard methods, and this standardized concentration is then used for all subsequent experiments, eliminating the need to repeatedly perform complex dilution series and CFU counting.
Solution Approach 2:
The patent creates multiple standardized copies of inoculum with known concentrations. Instead of performing complex measurements for each new culture preparation, the same standardized concentration information is copied across multiple inoculum batches, ensuring consistency and reducing measurement complexity.
5Quantity of substance
If stepwise inoculum development is performed to increase culture volume, then the desired level of inoculum can be achieved, but the process leads to substantial time spent preparing inocula
Solution Approach 1:
The patent performs the entire inoculum preparation process, including volume expansion and concentration standardization, in advance and stores the resulting standardized pellets. When needed, the inoculum is ready for immediate use without requiring time-consuming stepwise development during the actual experiment.
Solution Approach 2:
The patent changes the physical form of the inoculum from liquid culture requiring gradual expansion to solid pellets that can be directly transferred. This parameter change allows the inoculum to be prepared in advance and stored, eliminating the time required for stepwise volume increase during use.
6Quantity of substance
If multiple stages of cultivation are performed to produce inocula, then the volume and concentration can be increased, but the probability of mutations occurring increases
Solution Approach 1:
The patent performs the culture expansion and selection steps in advance when creating the standardized inoculum pellets. The pellets are prepared from well-characterized reference cultures and then stored, minimizing the number of cultivation stages during actual use and reducing opportunities for mutations to occur.
Solution Approach 2:
The patent extracts microorganisms from multiple sequential culture stages and consolidates them into standardized pellets prepared from a single reference culture. This approach reduces the cumulative effect of multiple cultivation stages and minimizes the probability of mutations accumulating across stages.
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 approach simplifies inoculum production, reduces contamination risks, and ensures genetic consistency, significantly decreasing production time and costs while maintaining the viability of microorganisms for long-term storage and use in various applications.
Implementation Method 1
mixing alginate and agar to produce a semi-viscous solution; depositing aliquots of the culture mixed with semi-viscous solution as droplets into a cold CaCl2 solution
Implementation Method 2
mixing alginate and agar to produce a semi-viscous solution; depositing aliquots of the culture mixed with semi-viscous solution as droplets into a cold CaCl2 solution
Implementation Method 3
adding a sterilized cryoprotectant, such as glycerol, to the CaCl2 solution
Data Source
AI summary
The subject invention provides standardized, high concentration inocula in solid form for use as seed cultures in scaled-up cultivation. Further embodiments include methods of producing standardized inocula, as well as methods of preserving and storing the inocula for convenient use over extended periods of time.