Stem Cell Culture Medium Composition for L-Tryptophan Depletion

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Solution Overview

Problem

Existing culture media for pluripotent stem cells are inefficient and costly due to rapid depletion of L-tryptophan, an essential amino acid, limiting cell proliferation and requiring large volumes of media for mass production.

Innovation Solution

Incorporating L-tryptophan or its derivatives at concentrations above 176 µM in a serum-free medium formulation to maintain adequate L-tryptophan levels during cell culture, promoting sustained proliferation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional culture media with standard L-tryptophan concentrations (2-20 mg/L) are used, then basic cell culture requirements are met, but L-tryptophan depletes rapidly during mass proliferation, limiting productivity

Engineering Contradiction:
Improvecell proliferation rateVSAvoidL-tryptophan depletion
Core Design Contradiction:
ProductivityVSLoss of substance

Solution Approach 1:

The patent applies parameter changes by significantly increasing the L-tryptophan concentration in the culture medium from the conventional 2-20 mg/L to 176-1408 μM (6.6-52.8 mg/L). This parameter modification prevents rapid depletion during mass proliferation while maintaining cell undifferentiated state, directly resolving the contradiction between productivity improvement and substance loss.

Inventive Principle:
Principle #35Parameter changes

2Productivity

If large volumes of conventional medium are used to supply sufficient L-tryptophan, then cell proliferation is maintained, but culture costs increase significantly

Engineering Contradiction:
Improvecell output quantityVSAvoidmedium volume required
Core Design Contradiction:
ProductivityVSQuantity of substance

Solution Approach 1:

By changing the L-tryptophan concentration parameter in the medium formulation, the patent enables efficient mass proliferation of pluripotent stem cells in smaller medium volumes. The optimized concentration ensures adequate amino acid supply throughout the culture period, reducing the total medium volume needed while maintaining high cell output.

Inventive Principle:
Principle #35Parameter changes

3Productivity

If L-tryptophan concentration is increased above conventional levels, then proliferation is enhanced, but maintaining undifferentiated state becomes more difficult

Engineering Contradiction:
Improveproliferation rateVSAvoidundifferentiated state maintenance
Core Design Contradiction:
ProductivityVSStability of the object's composition

Solution Approach 1:

The patent identifies a specific parameter range for L-tryptophan (176-1408 μM) that simultaneously achieves high proliferation rates and maintains undifferentiated state stability. This optimized parameter range resolves the contradiction by providing sufficient amino acids for cell division while preventing differentiation through appropriate concentration control.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentEP3604503B1Additive for undifferentiation maintaining medium
Publication Date: 2026.03.18 AJINOMOTO CO INC
  • EP3604503B1 patent drawingFigure 1~2
  • EP3604503B1 patent drawingFigure 3~4
  • EP3604503B1 patent drawingFigure 5~6

AI summary

The present invention provides a medium for culturing pluripotency stem cells, containing L-tryptophan or L-tryptophan derivative at a concentration of not less than 176 µM.