Polymer Microtiter Plate with Sustained Glucose Release
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Solution Overview
Problem
Conventional microtiter plates face limitations in carbon delivery, leading to rapid nutrient exhaustion, which hampers the growth and differentiation of cells, especially in screening libraries, due to their batch-based nutrient provision and limited scalability.
Innovation Solution
A culture plate made from a polymer matrix incorporating a releasable culture component, such as glucose, which provides a controlled and sustained release of nutrients, mimicking fed-batch culture conditions, thereby maintaining optimal growth and protein production over extended periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If batch nutrient provision is used in conventional microtiter plates, then the plate structure is simple and easy to manufacture, but nutrients are rapidly exhausted leading to limited culture duration
Solution Approach 1:
The patent incorporates nutrients, particularly glucose, directly into the polymer matrix of the microtiter plate during manufacturing. This preliminary action ensures that nutrients are pre-loaded and released gradually during cell culture, extending culture duration without requiring complex external delivery systems. The polymer matrix acts as a reservoir that releases nutrients over time as cells consume them.
Solution Approach 2:
The patent changes the physical and chemical parameters of the plate structure by using a polymer matrix with controlled porosity and degradation characteristics. This allows the plate to transition from a static structure to one that dynamically releases nutrients, extending the effective culture period while maintaining structural integrity throughout the extended duration.
2Duration of action of stationary object
If slow-release systems like Feedbead discs are used, then nutrient release is extended, but the system interferes with bulk pipetting and has limited scalability
Solution Approach 1:
The patent merges the function of the plate structure with the nutrient delivery function by incorporating glucose and other nutrients directly into the polymer matrix. This eliminates the need for separate Feedbead discs or coatings, as the plate itself becomes the nutrient reservoir. The merged structure provides extended nutrient release without interfering with pipetting operations, since there are no separate components to obstruct liquid handling.
Solution Approach 2:
The polymer matrix plate serves multiple functions simultaneously: it provides structural support for the wells, acts as a barrier to contamination, and functions as a nutrient reservoir for gradual release. This multi-functionality eliminates the need for additional components like Feedbead discs, simplifying the system while maintaining extended nutrient availability and full pipetting accessibility.
3Productivity
If high concentration of glucose is provided in conventional plates, then initial cell growth is supported, but glucose is rapidly exhausted causing growth to halt before differences between strains can be observed
Solution Approach 1:
The patent pre-loads the polymer matrix with high concentrations of glucose (up to 30% by weight) during manufacturing. This preliminary action ensures that sufficient nutrient reserves are available from the start to support rapid initial cell growth, while the controlled release mechanism prevents premature exhaustion. The matrix releases glucose at a rate that matches cellular consumption, maintaining productive growth throughout the extended observation period.
Solution Approach 2:
The polymer matrix provides continuous glucose release throughout the culture period, ensuring that nutrient supply never interrupts cell growth. This continuity of useful action allows cells to maintain productive growth rates for extended durations, enabling observation of growth differences between strains over longer periods without the growth halting that occurs in conventional batch systems.
4Quantity of substance
If Feedbead discs are used for controlled sugar release, then sugar availability is extended, but the release rate is fastest when cell amount is lowest causing overflow metabolism
Solution Approach 1:
The patent changes the release kinetics parameters by incorporating glucose into the polymer matrix at controlled concentrations (15-30% by weight). The polymer matrix structure and degradation characteristics are optimized to provide a release rate that scales with cellular demand. This ensures that glucose is released at appropriate rates throughout culture, preventing the overflow metabolism that occurs when release rates are decoupled from cellular consumption rates.
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 ensures consistent and reproducible protein production, normalizes growth rates across different strains, and allows for extended culture times, enabling the detection of larger differences in productivity, thus facilitating strain selection and process optimization.
Implementation Method 1
the polymer is formed by polymerization of a monomer in a mold
Implementation Method 2
the polymer is formed by polymerization of a monomer in a mold
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
The invention provides a culture plate made from a polymer incorporating a culture component releasable into culture media in the well, methods of culturing a microorganisms in the culture plate, and a methods of making the culture plate.