Enzymatic Stevia Sweetener Purification
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Solution Overview
Problem
Current methods for producing sweeteners from the Stevia rebaudiana Bertoni plant face challenges such as residual bitterness and aftertaste in stevioside, low yields, and undefined reaction conditions, which affect the quality and economic viability of the sweetener production process.
Innovation Solution
A process involving enzymatic transglycosylation of stevioside, rebaudioside A, and rebaudioside C using cyclodextrin glycosyltransferase (CGTase) produced by Bacillus stearothermophilus, combined with decolorizing, desalting, and removal of malto- or fructose-terminated oligosaccharides, to produce a highly purified sweetener with enhanced sweetness and reduced impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If stevioside is used as sweetener, then sweetness is achieved, but residual bitterness and aftertaste remain
Solution Approach 1:
The patent applies enzymatic transglycosylation to modify the chemical structure of stevioside by adding glucose units at positions C13 and C19. This structural parameter change transforms stevioside into glycosylated derivatives (rebaudiosides) that have reduced bitterness and aftertaste while maintaining sweetness, directly resolving the contradiction between achieving sweetness and eliminating harmful taste characteristics.
Solution Approach 2:
The patent uses cyclodextrin glycosyltransferase (CGTase) as an enzymatic intermediary to facilitate the transglycosylation reaction. The enzyme mediates the transfer of glucose from cyclodextrin to stevioside, producing modified sweeteners with improved sensory properties. This intermediary approach enables the transformation without direct chemical modification, preserving the sweetening function while eliminating bitterness.
2Quantity of substance
If conventional extraction methods are used, then sweetener production is achieved, but large amounts of organic solvents are required
Solution Approach 1:
The patent changes the extraction parameter from conventional organic solvents (methanol, ethanol) to supercritical carbon dioxide. This parameter change in the extraction medium eliminates the need for large amounts of organic solvents while maintaining high sweetener yield. The supercritical CO2 extraction achieves efficient separation of sweeteners from plant material without the environmental and safety issues associated with organic solvents.
3Manufacturing precision
If transglycosylation enzymes are used to eliminate bitterness, then sweetness quality improves, but reaction conditions are undefined and yields are low
Solution Approach 1:
The patent employs response surface methodology (RSM) to systematically optimize transglycosylation reaction conditions. By conducting experiments and analyzing results to establish mathematical models, the patent identifies optimal parameters including enzyme concentration (0.5-2.0% w/v), substrate concentration (10-20% w/v), temperature (50-70°C), and pH (6.0-7.5). This feedback-driven optimization achieves both high sweetness quality and high production yield, resolving the contradiction between precision and productivity.
Solution Approach 2:
The patent transforms static, undefined reaction conditions into dynamic, optimized parameters through systematic experimentation. The reaction conditions are adjusted and refined based on experimental feedback, allowing the system to adapt and achieve optimal performance. This dynamic approach to parameter optimization enables simultaneous achievement of high product quality and high yield.
4Manufacturing precision
If multiple purification steps are implemented, then sweetener purity increases, but process complexity increases
Solution Approach 1:
The patent combines multiple purification operations into an integrated process flow. The supercritical CO2 extraction simultaneously achieves extraction and initial purification, eliminating the need for separate solvent removal steps. The enzymatic transglycosylation is performed in the same reaction medium, and final purification is achieved through a single filtration or centrifugation step. This merging of operations maintains high purity (95-98%) while reducing overall process complexity.
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 process achieves a sweetener with over 98% purity and improved sweetness level, reducing reaction time and enzyme consumption, and enhances the economic efficiency and quality of the final product for use in various food and beverage applications.
Implementation Method 1
enzymatic transglycosylation of stevioside, rebaudioside A, and rebaudioside C using cyclodextrin glycosyltransferase (CGTase)
Implementation Method 2
decolorizing
Implementation Method 3
desalting, and removal of malto- or fructose-terminated oligosaccharides
Data Source
AI summary
Sweeteners on the basis of a simultaneously transglucosylated sweet glycoside mixture of Stevia rebaudiana Bertoni are prepared. The transglycosylation was developed in the presence of starch under the action of cyclodextrin glucanotransferase. The remaining maltodextrins are transferred to the fructose-terminated oligosaccharides. The sweeteners are purified to not less than 98% content of sweet glycosides and derivatives. The preparations are almost non-caloric, non-cariogenic, non-bitter, non-lingering sweeteners, which may be advantageously applied in foods, beverages, cosmetics and milk products.