Lipid — FTIR absorption peaks and assignments

Quick answer

Lipid is usually assigned by looking for a recurring cluster of characteristic peaks rather than one exact textbook number. The table below shows where the literature most often places this group in FTIR, ranked by accumulated evidence.

Characteristic FTIR peaks for Lipid

Showing the 30 best-supported peaks of 205 total for Lipid.

Spectrum logic

A functional-group assignment becomes more confident when several expected bands appear together. Use this page to find the strongest-supported peaks, then confirm that the same sample exhibits a coherent pattern rather than a single isolated hit.

Real-world usage

These pages are useful for unknown material analysis, peak explanation in reports, polymer troubleshooting, and verifying whether a candidate material family is chemically plausible.

Common mistakes

• Using one functional-group page as a complete material verdict without checking the rest of the spectrum.
• Assuming the strongest band is always the most diagnostic one.
• Forgetting that processing, additives, aging, and mixtures can shift or broaden expected peaks.

Verification advice

Use DSC, GC-MS, or TGA when several material families share similar bands or when mixture effects make the FTIR assignment uncertain.

Literature behind these assignments

• 1468 cm⁻¹ confidence 1.0

  “The 1468 peak was correlated to CH bending vibrations of lipids.”

  The Effect of High-Intensity Ultrasound and Natural Oils on the Extraction and Antioxidant Activity of Lycopene from Tomato (Solanum lycopersicum) Waste DOI: 10.3390/antiox11071404
• 2920 cm⁻¹ confidence 1.0

  “A sharp peak at 2920 and 2850 was attributed to the presence of polysaccharides, lipids, and carbohydrates (C-H stretch).”

  Classification and identification of Rhodobryum roseum Limpr. and its adulterants based on fourier-transform infrared spectroscopy (FTIR) and chemometrics DOI: 10.1371/journal.pone.0172359
• 1709 cm⁻¹ confidence 1.0

  “In comparison to native cm-1 starch, the FTIR spectra of the starch-lipid complexes revealed one extra band at 1709 starch, the FTIR spectra of the starch-lipid complexes revealed one extra band at 1709 cm-1 (Figure 4).”

  Formation of Intermediate Amylose Rice Starch–Lipid Complex Assisted by Ultrasonication DOI: 10.3390/foods11162430
• 1780 cm⁻¹ confidence 1.0

  “LLM confirmed rule peak-group candidate”

  Comparing dried and liquid blood serum samples of depressed patients: An analysis by Raman and infrared spectroscopy methods DOI: 10.1016/j.jpba.2017.11.074
• 2923 cm⁻¹ confidence 1.0

  “Peaks at 2923 and 2853 were mainly associated with the hydrocarbon chains of the lipids or lignins [40].”

  Comparative Analysis of the Phenolic Profile of Lycium barbarum L. Fruits from Different Regions in China DOI: 10.3390/molecules27185842
• 1735 cm⁻¹ confidence 1.0

  “The shift in the peak at 1082 22 nificant differences among primary cells, cell lines and malignant the environment near the PO group underwent a series of cm21, cells in the shapes of the band at 1735 which may be alterations during malign”

  Erukhimovitch 等 - 2002 - Spectroscopic characterization of human and mouse DOI: 10.1562/0031-8655(2002)076
• 1742 cm⁻¹ confidence 1.0

  “In the vicinity of 1800~1400 187 cm-1 there were three important lipid peak at 1742, 1654, and 1438 relating to C=O 188 stretching, C=C stretching, and C-H scissoring deformation respectively.”

  Complementarity of FT-IR and Raman spectroscopies for the species discrimination of meat and bone meals related to lipid molecular profiles DOI: 10.1016/j.foodchem.2020.128754
• 1464 cm⁻¹ confidence 1.0

  “cm-1 cm-1, cm-1 cm-1 1351.855 for CH wagging, 1517.703 1538.917 and 1646.911 for amide II and amide 2 cm-1 I as well as the peak at 1463.706 assigned to CH scissoring mode of the acyl chain of lipids.”

  Diagnosis of normal and malignant human gastric tissue samples by FTIR spectra combined with mathematical models DOI: 10.1016/j.molstruc.2020.129493