Reduced Glutathione Crystallization for Low Cysteinylglycine Impurity
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Solution Overview
Problem
Conventional methods struggle to effectively reduce the content of L-cysteinyl-L-glycine impurities in glutathione, which are known to generate free radicals and pose safety concerns, particularly in pharmaceutical and food applications where impurity levels need to be below 0.05%.
Innovation Solution
A method involving the use of a cation exchange resin with a high crosslinking degree to adsorb and remove L-cysteinyl-L-glycine from an aqueous solution containing reduced glutathione, followed by precipitation and collection of the crystal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If glutathione is produced by chemical synthesis, then production cost is reduced, but the product contains impurities and has poor market acceptance
Solution Approach 1:
The patent uses a specific organic solvent system (methyl tert-butyl ether and water in 1:1 v/v ratio) as an intermediary medium to enable selective crystallization. This solvent system acts as a mediator that allows the glutathione to crystallize in a pure form while leaving impurities in the mother liquor, thus achieving both cost-effective production and high product purity
Solution Approach 2:
The patent employs parameter changes by adjusting the solvent composition ratio (methyl tert-butyl ether to water), temperature (cooling from room temperature to 4°C), and pH conditions to optimize the crystallization process. These parameter adjustments enable the separation of pure glutathione crystals from impurities while maintaining production efficiency
2Manufacturing precision
If glutathione is produced by fermentation, then product purity is improved, but production cost increases and productivity is low
Solution Approach 1:
The patent extracts pure glutathione from the fermentation broth through crystallization using the methyl tert-butyl ether-water solvent system. This extraction process separates the active ingredient from the complex fermentation medium, achieving high purity (99.5% or higher) while maintaining productivity through efficient crystallization and filtration processes
3Ease of manufacture
If conventional crystallization methods are used, then production cost is reduced, but crystal quality is poor and dissolution is slow
Solution Approach 1:
The patent optimizes crystallization parameters including solvent composition (methyl tert-butyl ether and water in 1:1 v/v ratio), temperature gradient (cooling from room temperature to 4°C), and pH control to produce high-quality crystals with appropriate morphology and rapid dissolution characteristics, thereby achieving both cost-effectiveness and superior crystal quality
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 achieves a crystal of reduced glutathione with significantly reduced L-cysteinyl-L-glycine content, along with other impurities, meeting stringent safety standards for pharmaceutical and food applications.
Implementation Method 1
adding thereto an organic solvent system comprising methyl tert-butyl ether and water in a volume ratio of 1:1 to carry out crystallization
Implementation Method 2
adding activated carbon to the reaction mixture, stirring the mixture at 20° C. for 10 minutes, and then filtering the mixture
Data Source
Figure 1
AI summary
According to the present invention, a crystal of reduced glutathione having a reduced content of impurities, particularly L-cysteinyl-L-glycine and a method for producing the same are provided. The present invention relates to a crystal of reduced glutathione, wherein, in a high-performance liquid chromatography (HPLC) analysis, the peak area of L-cysteinyl-L-glycine is 0.02 or less with respect to the peak area of reduced glutathione which is taken as 100.