Steviol Glycoside Fermentation for Consistent, Diverse Sweetener Production
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Solution Overview
Problem
The existing methods for extracting steviol glycosides from the Stevia plant are variable and costly, requiring substantial land, time, and labor, and yield inconsistent results due to agricultural and environmental conditions.
Innovation Solution
The production of new steviol glycosides through fermentation using recombinant yeast cells engineered with specific nucleic acid sequences to produce steviol glycosides, including rebA, offering alternative and improved taste profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If steviol glycosides are extracted from the Stevia plant using traditional methods, then the sweeteners can be obtained, but the yields are variable and affected by agriculture and environmental conditions, and the process requires substantial land area, long time prior to harvest, and intensive labour
Solution Approach 1:
The patent replaces the mechanical/agricultural extraction system with a biological fermentation system. Recombinant yeast cells are engineered to express the complete steviol glycoside biosynthesis pathway, converting plant-based extraction to microorganism-based production. This substitution eliminates dependence on agricultural conditions while enabling controlled, scalable fermentation production of steviol glycosides.
Solution Approach 2:
The patent creates a microbial copy of the Stevia plant's biosynthetic pathway by transferring and expressing the complete gene cluster (CPS, KS, KO, KAH, CPR, UGT1, UGT3, UGT4) in recombinant yeast cells. This copying of the genetic blueprint allows the yeast to produce steviol glycosides identically to the plant but under controlled fermentation conditions, ensuring consistent yields independent of environmental factors.
2Quantity of substance
If traditional plant extraction methods are used, then steviol glycosides can be produced, but additional costs are incurred for extraction and purification of the glycosides
Solution Approach 1:
The patent replaces costly chemical extraction and purification processes with biological fermentation. The recombinant yeast cells directly synthesize and secrete steviol glycosides into the fermentation medium, eliminating the need for solvent extraction, filtration, and purification steps required by traditional plant-based methods, thereby reducing manufacturing costs.
Solution Approach 2:
The engineered yeast cells perform self-service by autonomously carrying out the complete biosynthesis of steviol glycosides through the expressed gene cluster. The cells convert simple substrates into the target compounds using their own metabolic machinery, eliminating the need for external extraction and purification interventions that incur additional costs.
3Adaptability or versatility
If more steviol glycoside varieties are produced to provide alternative taste profiles, then application suitability is improved, but the complexity of production systems increases
Solution Approach 1:
The patent creates a universal recombinant yeast platform that can produce multiple steviol glycoside varieties (stevioside, rebaudioside A, rebaudioside D, rebaudioside M, and novel compounds) using a single engineered strain expressing the complete gene cluster. This multi-functional system allows production of diverse taste profiles from one production platform, avoiding the need for separate production lines for each glycoside variety.
Solution Approach 2:
The patent achieves taste profile diversity by adjusting fermentation parameters and genetic expression levels rather than creating fundamentally different production systems. By modifying expression conditions of the UGT genes (UGT1, UGT3, UGT4) and their substrates, the system can shift production toward different steviol glycoside variants, enabling versatile application suitability without increasing production system 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 fermentation method provides consistent yields of steviol glycosides with diverse sensory properties, enabling their use in sweetener compositions and food products with improved taste characteristics.
Implementation Method 1
fermenting the recombinant yeast cell in a suitable fermentation medium
Data Source
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AI summary
The present invention relates to a steviol glycoside having the formula of (I) wherein at least 3 sugar moieties are present at positions R1 and at least three sugar moieties are present at position R2 and wherein the steviol glycoside comprises at least seven sugar moieties all of which are linked, directly or indirectly, to the steviol aglycon by β-linkages.