Breakthrough Tracker record
A hybrid chemical-biological process converted lignin to adipic acid at a record reported single-product yield
Reductive processing of poplar lignin produced alkyl-aromatic mixtures that catalytic oxidation converted to aromatic carboxylic acids at up to 73 wt%. Engineered Pseudomonas putida funnelled the mixture toward muconolactone and then adipic acid at up to 26 wt% relative to starting lignin.
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- Stable ID
science-2026-lignin-to-adipic-acid- Revision
science-2026-lignin-to-adipic-acid.v1- Field
- Chemistry · Biorefining and sustainable materials
- Evidence
- Tier 2 · Peer reviewed: Yes
- Record state
- Current · Peer-reviewed process result
- Last checked
AI role
No substantive AI role was reported.
Record details
- Problem or result
- Lignin is abundant but chemically heterogeneous, making it difficult to convert into one high-value product rather than low-value heat or a complex mixture.
- Authors
- Kathryn M. Mains, Chad T. Palumbo, Davide Rigo et al.
- Institutions
- National Laboratory of the Rockies; Oak Ridge National Laboratory; MIT; University of Wisconsin-Madison
- Result date
- June 10, 2026
Why it matters
Combining refinery-like redox chemistry with microbial funnelling offers a plausible route from lignin to one high-volume nylon precursor.
Limits
This is not a commercial refinery: feedstock variability, catalyst recovery, solvent and hydrogen demand, fermentation economics, purification, lifecycle carbon and scale remain open. The demonstrated yield is below the paper's 57 wt% theoretical maximum, and several authors filed a patent application.
Sources
- Primary: Nature primary paper
- Primary: Sequence-data accession
- Independent: Nature News and Views
Correction and revision history
- 2026-06-10 — Hybrid chemical-biological lignin-conversion study published in Nature.
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