Nitrile Hydratase Stability via Zinc Control

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Solution Overview

Problem

Enzyme deactivation in the production of amide compounds from nitrile compounds using biocatalysts, which cannot be explained by previously identified impurities, leads to reduced productivity.

Innovation Solution

Reducing the zinc concentration in nitrile compounds to 0.4 ppm or lower and the hydrocyanic acid concentration to 1.5 ppm or lower, followed by purification processes such as distillation, alkali treatment, and adsorption using materials like activated carbon and ion exchange resins, to enhance nitrile hydratase activity and improve amide compound production.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If nitrile compounds are used in conventional industrial production methods with metal catalysts, then amide compounds can be produced, but the reaction conditions are harsh and conversion rates are lower

Engineering Contradiction:

Improveenzyme stabilityVSAvoidconversion rate

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent changes the chemical parameters of the nitrile compound by controlling the concentration of zinc (0.4 ppm or lower) and hydrocyanic acid (1.5 ppm or lower), which fundamentally alters enzyme stability and activity, leading to both reliable enzyme performance and high conversion rates

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent performs preliminary purification actions on the nitrile compound before the enzymatic reaction to remove harmful impurities (zinc and hydrocyanic acid), preventing enzyme deactivation before it occurs and ensuring high productivity throughout the reaction process

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If nitrile hydratase enzymes are used to produce amide compounds, then milder reaction conditions and higher selectivity are achieved, but enzyme deactivation occurs due to unknown impurities

Engineering Contradiction:

Improvereaction conditionsVSAvoidenzyme activity

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent identifies and converts the harmful effect of trace impurities (zinc and hydrocyanic acid) into a beneficial control mechanism by establishing specific concentration limits, thereby transforming the previously unknown enzyme deactivation cause into a controllable parameter that ensures reliable enzyme activity

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent introduces purification processes (distillation, alkali treatment, adsorption) as intermediary steps between the nitrile compound production and the enzymatic reaction, removing harmful impurities and protecting the enzyme activity

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If purification processes are implemented to remove impurities, then enzyme activity is maintained, but production complexity increases

Engineering Contradiction:

Improveenzyme activityVSAvoidproduction process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent simplifies the purification approach by focusing on controlling two key parameters (zinc concentration ≤0.4 ppm and hydrocyanic acid concentration ≤1.5 ppm) rather than implementing complex multi-step purification systems, achieving reliable enzyme activity through parameter control

Inventive Principle:

Principle #35Parameter changes

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

Suppression of nitrile hydratase activity decrease, resulting in efficient production of amide compounds with higher reaction rates and improved quality, as demonstrated by the examples provided.

Implementation Method 1

nitrile hydratases with nitrile hydration activity capable of hydrating nitrile groups to convert them into amide groups were found among the enzymes found in microorganisms, and nitrile hydratase enzymes or microbial cells containing the enzymes are used to produce amide compounds from nitrile compounds

Methodology Applied

Scientific EffectEnzyme catalysis: Enzyme

Implementation Method 2

the purification process includes one or multiple procedures selected from among distillation, alkali treatment, ion exchange resin and removal by adsorption

Methodology Applied

Scientific EffectDistillation: Distillation

Implementation Method 3

removal by adsorption (removal using adsorbents such as activated carbon, activated alumina, zeolite and silica gel)

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS9382560B2Method for producing amide compound

Publication Date: 2016.07.05 MITSUBISHI CHEM CORP

AI summary

The invention pertains to a technique for suppressing a decrease in nitrile hydratase activity and improving the productivity of the amide compound in the course of producing an amide compound from a nitrile compound using a biocatalyst. Specifically, the invention pertains to a method for producing the corresponding amide compound from a nitrile compound in the presence of a biocatalyst having nitrile hydratase activity, wherein the method for producing an amide compound using a nitrile compound is characterized in that the zinc concentration of the nitrile compound is 0.4 ppm or less.