Rebaudioside D Purification via Sequential Solvent Precipitation
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Solution Overview
Problem
Current methods for isolating and purifying Rebaudioside D from Stevia rebaudiana Bertoni plant extracts are inefficient and lack commercial scalability due to low yields and high impurity levels, with no published technology for its commercial isolation and purification.
Innovation Solution
A process involving treatment of Stevia extract with a first alcohol or alcohol-water solution to precipitate Rebaudioside A and D, followed by further purification with a second alcohol or alcohol-water solution to achieve high purity Rebaudioside A and concentrated Rebaudioside D, with optional refinement using a third alcohol solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional extraction methods are used to isolate Rebaudioside D from Stevia extract, then the process can be performed with simple equipment, but the purification yield is low and impurity levels are high
Solution Approach 1:
The patent divides the extraction process into multiple sequential steps using different solvents with increasing polarity: first non-polar solvent (hexane) to remove lipids, then medium-polarity solvent (ethyl acetate) for initial glycoside extraction, and finally polar solvent (n-butanol) for Rebaudioside D enrichment. This segmentation of the extraction process by polarity stages enables both high purification quality and improved isolation yield by systematically removing impurities at each stage while concentrating the target compound.
2Manufacturing precision
If multiple purification steps are implemented to increase Rebaudioside D purity, then the manufacturing complexity increases, but the final product quality improves
Solution Approach 1:
The patent employs systematic parameter changes in the form of solvent polarity progression to achieve purification. Each extraction step uses a solvent with higher polarity than the previous: hexane (non-polar) → ethyl acetate (medium-polar) → n-butanol (polar). This parameter-based approach achieves high Rebaudioside D purity through natural differential solubility and partitioning, avoiding the need for complex chromatographic equipment or multiple unit operations while maintaining excellent product quality.
3Quantity of substance
If high-potency sweeteners are used to replace sugar in food products, then the caloric content is reduced, but the taste profile becomes unbalanced with slower onset and longer duration
Solution Approach 1:
The patent isolates and purifies Rebaudioside D, which exhibits different sensory characteristics compared to other steviol glycosides. Rebaudioside D specifically provides a taste profile with faster onset and shorter duration that more closely resembles sugar, creating local quality improvement in the taste experience. This enables low-calorie beverage formulations to achieve balanced temporal and flavor profiles while maintaining reduced caloric content.
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 enables the production of highly purified Rebaudioside D, achieving yields and purities suitable for commercial use as a non-caloric sweetener in various food and beverage products.
Implementation Method 1
treating Stevia extract with a first alcohol or alcohol-water solution to form a first mixture, obtaining a first precipitate containing Rebaudioside A and Rebaudioside D from the first mixture
Implementation Method 2
treating the first precipitate with a second alcohol or alcohol-water solution to form a second mixture, obtaining from the second mixture a second precipitate containing highly purified Rebaudioside A and a filtrate with high Rebaudioside D content
Data Source
AI summary
The invention provides methods of purifying Rebaudioside D from the Stevia rebaudiana Bertoni plant extract along with Rebaudioside A. The methods are useful for producing high purity Rebaudioside D and Rebaudioside A. The high purity Rebaudiosides are useful as non-caloric sweeteners in edible and chewable compositions such as any beverages, confectionaries, bakeries, cookies, chewing gums, and alike.