How can you identify proteins from FTIR?

Quick answer

proteins 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 proteins, 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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  AComDim, a multivariate tool to highlighting impact of agroclimatic factors on Moringa oleifera Lam. leaf’s composition from their FTIR-ATR profiles DOI: 10.1111/j.1745-4557.2008.00218.
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  Application of Fourier transform infrared spectroscopy with chemometrics on postmortem interval estimation based on pericardial fluids DOI: 10.1038/s41598-017-18228-7
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  Ganim 等 - 2008 - Amide I two-dimensional infrared Spectroscopy of p DOI: 10.1021/ar700188nCCC
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  Application of SPRA Technology for Delivery of Erythropoietin: Stability Evaluation of Conjugated Erythropoietin with Adamantane and in SPRA Inclusion Complex DOI: 10.5812/ijpr-134282.
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  Balakhnina 等 - 2017 - Low-frequency vibrational spectroscopy of proteins DOI: 10.1117/1.JBO.22.9.091509.
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  Fiocco 等 - 2021 - Reflection FTIR spectroscopy for the study of hist DOI: 10.1016/j.culher.2019.11.004.
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  Koliastasi 等 - 2019 - Emulsifiers from Partially Composted Olive Waste DOI: 10.3390/foods8070271
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  Investigation on thermallyinduced conformation transition of soy protein film with variabletemperature FTIR spectroscopy DOI: 10.1002/app.35309
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  FTIR spectral signature of the effect of cardiotonic steroids with antitumoral properties on a prostate cancer cell line DOI: 10.1016/j.bbadis.2010.07.012
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  Physico-chemical and colloidal properties of protein extracted from black soldier fly ( Hermetia illucens ) larvae DOI: 10.1016/j.ijbiomac.2021.07.081