Cell Suspension Additive Preventing Sedimentation
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Solution Overview
Problem
Current cell culture methods in suspension face challenges with passive sedimentation, leading to reduced oxygen and nutrient availability, cell-to-cell contact inhibition, and difficulties in high-throughput applications, especially in large-scale production and research requiring three-dimensional cell growth.
Innovation Solution
A cell culture medium additive comprising xanthan and a mannan-type polymer, such as galactomannans or glucomannans, is used to maintain cells in suspension, preventing sedimentation while allowing for three-dimensional aggregation and easy handling, suitable for automated systems and high-throughput screening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cells are grown in conventional suspension culture media, then cells can grow and divide freely as single cells, but cells passively drift under gravitational force towards the bottom of the culture vessel, leading to reduced oxygen and nutrient availability and elevated metabolic waste products
Solution Approach 1:
The patent introduces a polysaccharide additive as an intermediary substance that mediates between gravitational force and cells. This additive increases the viscosity of the culture medium, creating a resisting force that counteracts gravitational sedimentation while allowing cells to remain suspended in the bulk medium, thus maintaining both high productivity and cell viability
Solution Approach 2:
The patent changes the physical parameter of the culture medium by adding polysaccharide additives that increase viscosity. This parameter change transforms the medium from a low-viscosity state (where cells rapidly sediment) to a high-viscosity state (where cells remain suspended), thereby preventing the harmful effects of gravitational settling while preserving cell growth capabilities
2Reliability
If the cell culture medium is changed often to reduce the negative effects of cell accumulation at the base of the culture vessel, then cell viability is maintained, but the process becomes inefficient, labour intensive, expensive, and wasteful
Solution Approach 1:
The patent applies preliminary action by adding polysaccharide additives to the culture medium before cell sedimentation occurs. This preventive measure ensures cells remain suspended throughout the culture period, eliminating the need for frequent medium changes and reducing labor intensity and costs associated with repeated medium replacement
3Reliability
If cells are continually agitated in bioreactors to prevent sedimentation, then cells remain suspended, but the sustained mechanical perturbation is expensive and potentially damaging and destructive to the cells and their growth
Solution Approach 1:
The polysaccharide additive serves as an intermediary that provides the necessary suspension stability without requiring mechanical agitation. The increased viscosity creates a damping effect that naturally prevents sedimentation, eliminating the need for harmful mechanical perturbations while maintaining cell suspension stability
Solution Approach 2:
The patent substitutes the mechanical agitation system with a chemical/physical solution based on polysaccharide additives. Instead of using mechanical forces to prevent sedimentation, the invention uses the increased viscosity of the medium to create a passive suspension system, thereby eliminating mechanical damage to cells
4Shape
If cells aggregate to form multi-cellular bodies such as spheroids, then three-dimensional growth is achieved, but the size and structure of the multi-cellular bodies must be controlled to maintain rapid cell growth
Solution Approach 1:
The patent uses polysaccharide additives to change the physical parameters of the culture medium, specifically increasing viscosity. This parameter change allows cells to form three-dimensional spheroidal structures while maintaining suspension stability, enabling both 3D growth and rapid cell proliferation without the need for complex mechanical agitation systems
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 additive effectively keeps cells suspended, promoting three-dimensional growth, improving cell viability and productivity, enabling efficient high-throughput applications and maintaining the liquid-like properties of the medium, which is non-toxic and compatible with various research techniques.
Implementation Method 1
The additive effectively keeps cells suspended, promoting three-dimensional growth
Implementation Method 2
Cells which are grown in conventional suspension culture media passively drift under gravitational force, over very short periods of time, towards the bottom of the culture vessel
Implementation Method 3
The additive effectively keeps cells suspended, promoting three-dimensional growth
Data Source
AI summary
The present invention relates to a cell culture medium additive comprising a xanthan polysaccharide and a mannan polysaccharide, such as a glucomannan or a galactomannan, that supports the growth of cells in suspension, and to a cell culture medium containing the additive. More particularly, but not exclusively, the present invention relates to a cell culture medium additive that supports the formation of multicellular bodies such as spheroids, and prevents sedimentation of cells without adversely affecting the physical properties of the cell culture medium.