How can you identify protein from FTIR?

Quick answer

protein 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 protein, 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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  Vibrational Stark Spectroscopy of NO Bound to Heme:  Effects of Protein Electrostatic Fields on the NO Stretch Frequency DOI: 10.1021/ja0014741
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  Bergo 等 - 2009 - Active Water in Protein-Protein Communication with DOI: 10.1021/bi802180a.
• confidence 0.9

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  Protein Conformation in Amorphous Solids by FTIR and by Hydrogen/Deuterium Exchange with Mass Spectrometry DOI: 10.1529/biophysj.108.139899
• confidence 0.9

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  Advances in Atypical FT-IR Milk Screening: Combining Untargeted Spectra Screening and Cluster Algorithms DOI: 10.3390/foods10051111
• confidence 0.8

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  Conformational changes of enzymes adsorbed at liquid– solid interface: Relevance to enzymatic activity DOI: 10.1002/bip.10117
• confidence 0.8

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  Prinsloo 等 - 2014 - Infrared reflectance spectroscopy as an analytical DOI: 10.1021/ac203375.
• confidence 0.8

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  Tajmir-Riahi 等 - 2009 - Structural analysis of protein-DNA and protein-RNA DOI: 10.3233/SPE-2009-0371
• confidence 0.7

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  Feld 等 - 2021 - A Study of Microplastic Particles in Danish Tap Wa DOI: 10.3390/w13152097
• confidence 0.7

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  Gelfand 等 - 2015 - Characterization of Protein Structural Changes in DOI: 10.1021/acs.analchem.5b00371.
• confidence 0.7

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  Lopez-Lorente 等 - 2017 - Towards label-free mid-infrared protein assays in DOI: 10.1007/s00604-016-2031-0)