Enzymatic UDCA Synthesis with Stepwise Cofactor and Equilibrium Control
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Solution Overview
Problem
Existing enantioselective processes for preparing ursodeoxycholic acid suffer from cofactor incompatibility, enzyme instability, reversibility of reactions, and overall process complexity, limiting scalability and efficiency.
Innovation Solution
An improved enantioselective enzymatic process involving specific enzymes and cofactors, along with controlled pH and temperature conditions, is used to prepare ursodeoxycholic acid in multiple steps, including oxidation, reduction, and purification to achieve high enantiomeric purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a one-pot multienzyme cascade is used to improve conversion efficiency, then productivity increases, but device complexity and cofactor management difficulty increase
Solution Approach 1:
The patent divides the synthesis process into separate reaction steps rather than using a one-pot multienzyme cascade. Each enzymatic transformation (oxidation of cholic acid to 12-oxo cholic acid, reduction to 12-ketoursodeoxycholic acid, and final reduction to UDCA) is performed in distinct reaction vessels with dedicated enzyme systems. This segmentation simplifies cofactor management and enzyme optimization for each individual step while maintaining high overall productivity.
2Manufacturing precision
If enzymes with mismatched cofactor requirements are used to achieve enzymatic transformation, then manufacturing precision improves, but ease of operation deteriorates due to cofactor regeneration complexity
Solution Approach 1:
The patent employs an NADP+ regeneration system using glucose dehydrogenase (GDH) and glucose as intermediary components. Glucose dehydrogenase regenerates NADP+ from NADPH in a separate regeneration step, using glucose as a sacrificial substrate. This intermediary approach simplifies cofactor management by decoupling the enantioselective enzymatic transformations from complex cofactor recycling, making the process easier to operate while maintaining high enantioselectivity.
3Manufacturing precision
If dehydrogenase-catalyzed reactions are used to achieve selective transformations, then manufacturing precision improves, but reliability decreases due to reaction reversibility
Solution Approach 1:
The patent removes water, a reaction product, during the enzymatic transformations to shift reaction equilibria toward product formation. By preliminary removal of water through controlled reaction conditions and processing, the reversible dehydrogenase-catalyzed reactions are driven forward to completion, ensuring high selectivity and reliable product formation without requiring complex equilibrium control mechanisms.
4Productivity
If multiple enzymes with different stabilities are combined in a cascade to improve productivity, then productivity increases, but reliability decreases due to enzyme incompatibility
Solution Approach 1:
The patent separates enzymes with different stability requirements into distinct reaction steps rather than combining them in a single cascade. Each enzymatic transformation uses a dedicated enzyme system optimized for its specific conditions, ensuring reliable and stable operation at each step while maintaining high overall productivity through sequential processing.
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 high-yielding, enantioselective synthesis of ursodeoxycholic acid with enantiomeric purity of at least 99.75% and minimal impurities, meeting pharmaceutical standards.
Implementation Method 1
enantioselective oxidation of cholic acid of formula (II) in the presence of suitable enzymes
Implementation Method 2
enantioselective oxidation of cholic acid of formula (II)
Implementation Method 3
base catalysed reduction of the compound of formula (III)
Implementation Method 4
enantioselective oxidation of the compound of formula (IV) in the presence of suitable enzymes
Implementation Method 5
enantioselective oxidation of the compound of formula (IV)
Implementation Method 6
enantioselective reduction of compound of formula (V) in the presence of suitable enzymes
Implementation Method 7
enantioselective reduction of compound of formula (V)
Data Source
AI summary
Improved enantioselective enzymatic processes for preparing ursodeoxycholic acid with high pharmaceutical purity are provided. Also provided are improved enantioselective enzymatic processes for preparing ursodeoxycholic acid with high yield and high pharmaceutical and enantiomeric purity.