L-Glufosinate Enzymatic Conversion via PPO Intermediate
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing glufosinate yield a racemic mixture of L- and D-glufosinate, with L-glufosinate being more potent, and there is a need for cost-effective methods to produce pure L-glufosinate or a mixture enriched for L-glufosinate.
Innovation Solution
A two-step process involving oxidative deamination of D-glufosinate to PPO using a D-amino acid oxidase enzyme, followed by amination of PPO to L-glufosinate with a transaminase enzyme, utilizing amine donors, to achieve high yields of L-glufosinate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If current commercial chemical synthesis methods are used to produce glufosinate, then the production process is simple and cost-effective, but the output is a racemic mixture containing both L- and D-glufosinate, resulting in reduced potency and increased material consumption
Solution Approach 1:
The patent introduces an intermediary substance, PPO (2-oxo-4-(hydroxy(methyl)phosphinoyl)butyric acid), as a chiral intermediate in the synthesis pathway. By converting D-glufosinate to PPO through oxidative deamination and then selectively aminating PPO to L-glufosinate, the process achieves stereoselectivity without requiring complex chiral resolution steps, thus resolving the contradiction between manufacturing precision and process complexity
Solution Approach 2:
The patent employs enzymatic catalysis with specific stereospecificity parameters to control the amination step. By using transaminase enzymes that selectively convert PPO to L-glufosinate with high enantiomeric excess, the process achieves high manufacturing precision (≥85% yield of L-glufosinate) while maintaining reasonable process complexity through biocatalytic efficiency
2Reliability
If L-glufosinate is produced with high enantiomeric excess, then the herbicide potency is improved, but the production cost and process complexity increase
Solution Approach 1:
The patent implements a continuous two-step enzymatic process where D-glufosinate is continuously converted to PPO and then to L-glufosinate. The use of reusable enzymes (DAAO and transaminase) with high catalytic efficiency allows for continuous production with high enantiomeric excess (≥70% conversion, ≥85% yield), achieving both high reliability (potency) and ease of manufacture through efficient biocatalysis
Solution Approach 2:
The enzymatic process is self-regulating, with the DAAO enzyme specifically targeting D-glufosinate and the transaminase selectively producing L-glufosinate. The system automatically achieves high enantiomeric excess through the inherent stereospecificity of the enzymes, eliminating the need for additional purification steps or complex process controls, thus maintaining ease of manufacture while ensuring high herbicide potency
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 method achieves at least 70% conversion of D-glufosinate to L-glufosinate with a yield of at least 85% of the input racemic glufosinate, providing a more potent herbicide with reduced amounts needed for effective use.
Implementation Method 1
The first step of the process involves the oxidative deamination of D-glufosinate to PPO (2-oxo-4-(hydroxy(methyl)phosphinoyl)butyric acid)
Implementation Method 2
The second step involves the specific amination of PPO to L-glufosinate, using an amine group from one or more amine donors
Data Source
AI summary
Methods for the production of L-glufosinate (also known as phosphinothricin or (S)-2-amino-4-(hydroxy(methyl)phosphonoyl)butanoic acid) are provided. The methods comprise a two-step process. The first step involves the oxidative deamination of D-glufosinate to PPO (2-oxo-4-(hydroxy(methyl)phosphinoyl)butyric acid). The second step involves the specific amination of PPO to L-glufosinate, using an amine group from one or more amine donors. By combining these two reactions, the proportion of L-glufosinate in a mixture of L-glufosinate and D-glufosinate can be substantially increased.