Pyridinedicarboxylic Acid Copolymers from Lignin Biocatalysis

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Solution Overview

Problem

The environmental threat posed by highly stable plastics like PET, which are resistant to biodegradation, and the need for bio-based, biodegradable alternatives to petrochemical-derived plastics.

Innovation Solution

A biocatalytic process using Rhodococcus jostii RHA1 bacteria modified with protocatechuate dioxygenases to convert lignin-derived 3,4-dihydroxybenzoic acid into pyridinedicarboxylic acids, which are then used to form biodegradable copolymers similar to PBAT or PET.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If PET is used for plastic production, then mechanical strength and stability are improved, but biodegradability deteriorates

Engineering Contradiction:

Improvemechanical strengthVSAvoidresistance to biodegradation

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The invention changes the chemical composition parameters of the polymer by incorporating biodegradable components (polycaprolactone, polylactic acid, starch) alongside PET, creating a copolymer blend that maintains mechanical strength while enabling biodegradation. This parameter change in composition resolves the contradiction between strength and biodegradability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite material system combining PET with biodegradable polymers (polycaprolactone, polylactic acid, starch) to form a multi-component copolymer. This composite approach allows the material to exhibit both the mechanical properties of PET and the biodegradability of natural polymers, resolving the technical contradiction.

Inventive Principle:

Principle #40Composite materials

2Productivity

If terephthalic acid is manufactured from para-xylene, then production efficiency is improved, but dependence on petrochemicals worsens

Engineering Contradiction:

Improveproduction efficiencyVSAvoiddependence on finite petrochemical resources

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The invention makes the polymer production process universal by accepting multiple feedstock types (both traditional petrochemical para-xylene and renewable biomass sources). This multi-functionality allows the same production system to operate with different carbon sources, reducing dependence on finite petrochemical resources while maintaining production efficiency.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention changes the feedstock parameter from exclusively petrochemical-based para-xylene to include renewable biomass-derived 3,4-dihydroxybenzoic acid. This parameter change in raw material sourcing enables sustainable production while maintaining industrial-scale efficiency through established biocatalytic and chemical processing methods.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If conventional polymer production methods are used, then manufacturing simplicity is maintained, but environmental sustainability deteriorates

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidenvironmental threat from non-biodegradable plastics

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The invention replaces conventional petrochemical-based mechanical/chemical synthesis with a biocatalytic approach using engineered bacteria (Rhodococcus jostii RHA1) to convert biomass-derived 3,4-dihydroxybenzoic acid into pyridinedicarboxylic acid monomers. This substitution maintains manufacturing feasibility while dramatically improving environmental sustainability by enabling biodegradability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

This process provides a novel, efficient route to produce biodegradable copolymers from renewable lignin, offering alternatives to PET and PBAT with similar properties, and can be integrated with existing industrial processes.

Implementation Method 1

A biocatalytic process using Rhodococcus jostii RHA1 bacteria modified with protocatechuate dioxygenases to convert lignin-derived 3,4-dihydroxybenzoic acid into pyridinedicarboxylic acids

Methodology Applied

Scientific EffectBiocatalysis: Enzyme

Implementation Method 2

3,4-Dihydroxybenzoic acid is normally metabolised via ortho-cleavage to the β-keto-adipate pathway. However, it has been found that a gene introduction approach can be used to reroute the aromatic degradation pathways downstream from lignin oxidation.

Methodology Applied

Scientific EffectMetabolism: Fermentation

Data Source

PatentUS20260085336A1New polymers and methods

Publication Date: 2026.03.26 BIOME BIOPLASTICS

AI summary

The present invention relates to processes for the formation of pyridinedicarboxylic acid (PDCA), in particular, 2,4-pyridinedicarboxylic acid (2,4-PDCA) and 2,5-pyridinedicarboxylic acid (2,5-PDCA), and mono- and diester derivatives thereof, from 3,4-dihydroxybenzoic acid, via a biocatalytic reaction using, for example, a protocatechuate dioxygenase such as protocatechuate 4,5-dioxygenase or protocatechuate 2,3-dioxygenase, and a nitrogen source. The invention also relates to copolymers that comprise the pyridinedicarboxylic acid monomers and derivatives thereof, processes for the formation of the copolymers and uses for the copolymers.