Rebaudioside M Purification via Direct Crystallization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for purifying rebaudioside M require multiple steps and the use of organic solvents, making them costly and inefficient, and do not meet the 95% purity standards set by JECFA, while also lacking a method for purifying rebaudioside M effectively.
Innovation Solution
Direct crystallization of rebaudioside M from a water solution, eliminating the need for organic solvents and chromatography, allowing for high purity achievement in a single operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple purification steps including chromatography are used, then purity of rebaudioside A is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and utilizes the specific solubility characteristics of rebaudioside A in ethyl acetate to separate it from other steviol glycosides. By exploiting this differential solubility, the method extracts rebaudioside A into the ethyl acetate phase while leaving impurities in the aqueous phase, achieving purification without complex chromatography equipment.
Solution Approach 2:
The patent changes the solvent system parameters by using ethyl acetate instead of traditional organic solvents like methanol or acetone. This parameter change in solvent selection, combined with controlled water content (4-15%), alters the solubility behavior to favor rebaudioside A extraction while maintaining operational simplicity and reducing equipment complexity requirements.
2Manufacturing precision
If organic solvents are used for purification, then purity is improved, but safety hazards and environmental impact worsen
Solution Approach 1:
The patent employs ethyl acetate, a solvent that can be easily evaporated and disposed of without requiring complex regeneration systems. The solvent's low boiling point allows for simple removal by evaporation, eliminating the need for expensive solvent recovery equipment and reducing safety hazards associated with handling large volumes of persistent organic solvents.
Solution Approach 2:
The patent changes the solvent parameters by selecting ethyl acetate with specific properties (moderate polarity, low toxicity, easy evaporation) instead of traditional high-purity requirements for methanol or acetone. This parameter change in solvent selection reduces safety hazards while maintaining effective purification capability.
3Manufacturing precision
If repeated re-crystallization steps are performed, then purity of rebaudioside A is improved, but loss of time and productivity decrease
Solution Approach 1:
The patent uses liquid-liquid extraction with ethyl acetate to selectively transfer rebaudioside A from the aqueous phase to the organic phase in a single operation. This extraction step achieves purification in one pass rather than requiring multiple re-crystallization cycles, significantly improving productivity while maintaining high purity levels.
Solution Approach 2:
The patent implements a continuous purification process where the ethyl acetate extraction is followed directly by evaporation and concentration without intermediate drying or multiple processing steps. This continuous action eliminates the time losses associated with repeated batch re-crystallization operations, maintaining high productivity throughout the purification sequence.
4Manufacturing precision
If chromatography is used for purification, then purity is improved, but cost and device complexity increase
Solution Approach 1:
The patent replaces the mechanical chromatography system (columns, resins, pumps) with a chemical separation approach using ethyl acetate extraction. This substitution eliminates the need for expensive chromatography equipment and resin materials, reducing both capital investment and operational costs while achieving equivalent or superior purity levels.
Solution Approach 2:
The patent changes the purification mechanism from physical adsorption chromatography to chemical solubility-based extraction. By adjusting solvent parameters (ethyl acetate with 4-15% water), the method achieves selective purification at lower cost without requiring expensive chromatography resins or specialized equipment.
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 method achieves high purity rebaudioside M compositions without organic solvents and chromatography, reducing costs and improving efficiency, meeting or exceeding JECFA purity standards.
Implementation Method 1
crystallizing from the solution a high purity composition comprising rebaudioside M
Data Source
AI summary
A method for purifying rebaudioside M, which method comprises: (a) providing a solution comprising rebaudioside M at a concentration of at least about 10 g/L and at a purity of at least about 10% by weight on a dry basis; and (b) crystallizing from the solution a high purity composition comprising rebaudioside M, thereby to purify rebaudioside M.