How can you identify lignin from FTIR?

Quick answer

lignin is usually reported with a recurring pattern of peaks and functional-group evidence. The most useful approach is to cross-check at least two characteristic peaks before treating it as a match, then verify whether the full spectrum still fits the same material family.

Peak interpretation

Possible materials / groups

Spectrum logic

The logic here is evidence aggregation: repeated literature mentions of lignin, repeated peak positions, and repeated functional-group associations. A strong material hypothesis should still be supported by multiple peaks that agree with each other, not by one headline band alone.

Real-world usage

This page is designed for polymer identification, incoming-material QC, unknown plastic analysis, recycled-content review, and literature-backed interpretation of reference spectra.

Common mistakes

• Calling a material match too early because one famous peak is present.
• Ignoring sample prep, fillers, oxidation, water, or additives that can change the apparent pattern.
• Using literature evidence without checking whether your own sampling mode and spectrum quality are comparable.

Verification advice

Use DSC, GC-MS, or TGA to validate the material hypothesis when the peak pattern is ambiguous or mixed.

Literature behind this page

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  lignin

  Growth of silicon carbide nanorods from the hybrid of lignin and polysiloxane using sol-gel process and polymer blend technique DOI: 10.1016/j.matlet.2009.08.029
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  FTIR studies of the changes in wood chemistry following decay by brown-rot and white-rot fungi DOI: 10.1016/S0964-8305(03)00052-0
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  Polypropylene/Lignin/POSS Nanocomposites: Thermal and Wettability Properties, Application in Water Remediation DOI: 10.3390/ma14143950
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  Synthesis of nano-fibrillated cellulose/magnetite/titanium dioxide (NFC@Fe3O4@TNP) nanocomposites and their application in the photocatalytic hydrogen generation DOI: 10.1016/j.apcatb.2017.01.021
• confidence 0.9

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  Anatomical and chemical analyses on wooden artifacts from a Samnite sanctuary in Hirpinia (Southern Italy) DOI: 10.1016/j.jas.2015.03.002
• confidence 0.9

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  Enhanced substrate degradation and methane yield with maleic acid pre-treatments in biomass crops and residues DOI: 10.1016/j.biombioe.2015.12.029
• confidence 0.9

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  Fornito 等 - 2020 - Degradative Ability of Mushrooms Cultivated on Cor DOI: 10.3390/molecules25133020
• confidence 0.9

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  Enhancing Thermal and Mechanical Properties of Ramie Fiber via Impregnation by Lignin-Based Polyurethane Resin DOI: 10.3390/ma14226850
• confidence 0.9

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  Use of alkyl ketene dimer (AKD) for surface modification of particleboard chips DOI: 10.1007/s00107-008-0275-z
• confidence 0.9

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  Biopolymer‐Modified Carbon Paste Electrode for the Electrochemical Detection of Pb(II) in Water DOI: 10.1155/2022/5348246