How can you identify DNA from FTIR?

Quick answer

DNA 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 DNA, 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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  DNA

  Insight into Rapid DNA-Specific Identification of Animal Origin Based on FTIR Analysis: A Case Study DOI: 10.3390/molecules23112842
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  DNA

  The Application of ATR-FTIR Spectroscopy and the Reversible DNA Conformation as a Sensor to Test the Effectiveness of Platinum(II) Anticancer Drugs DOI: 10.3390/s18124297
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  DNA

  Kahn 等 - 2009 - An FTIR Investigation of Flanking Sequence Effects DOI: 10.1021/bi8015235.
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  DNA

  Astragalin from Cassia alata Induces DNA Adducts in Vitro and Repairable DNA Damage in the Yeast Saccharomyces cerevisiae DOI: 10.3390/ijms13032846
• confidence 0.8

  DNA

  Extended-spectral-range Fourier transform infrared-attenuated total reflection spectroscopy on Si surfaces using a novel Si coated Ge attenuated total reflection prism DOI: 10.1116/1.580622
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  DNA

  Micro-Fourier-transform infrared reflectance spectroscopy as tool for probing IgG glycosylation in COVID-19 patients DOI: 10.1038/s41598-022-08156-6
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  DNA

  Use of Fourier-Transform Infrared Spectroscopy for DNA Identification on Recycled PET Composite Substrate DOI: 10.3390/app12094371
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  DNA

  Interactions of p53 with poly(ADP-ribose) and DNA induce distinct changes in protein structure as revealed by ATR-FTIR spectroscopy DOI: 10.1093/nar/gkz175
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  DNA

  Real-time monitoring of PARP1-dependent PARylation by ATR-FTIR spectroscopy DOI: 10.1038/s41467-020-15858-w
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  DNA

  Marques 等 - 2020 - A New Look into the Mode of Action of Metal-Based DOI: 10.3390/molecules25020246