Lipid — FTIR-absorptions-toppe og tildelinger

Hurtigt svar

Lipid tildeles normalt ved at lede efter en tilbagevendende klynge af karakteristiske toppe frem for et præcist lærebogsnummer. Tabellen nedenfor viser, hvor litteraturen oftest placerer denne gruppe i FTIR, rangeret efter akkumuleret evidens.

Karakteristiske FTIR-toppe for Lipid

Viser de 30 bedst understøttede toppe ud af 218 i alt for Lipid.

Spektrumlogik

En funktionel gruppetildeling bliver mere sikker, når flere forventede bånd optræder sammen. Brug denne side til at finde de bedst understøttede peaks, og bekræft derefter, at den samme prøve udviser et sammenhængende mønster snarere end et enkelt isoleret hit.

Anvendelse i virkeligheden

Disse sider er nyttige til analyse af ukendte materialer, topforklaring i rapporter, polymerfejlfinding og verifikation af, om en kandidatmaterialefamilie er kemisk plausibel.

Almindelige fejl

• Brug af én funktionel-gruppe-side som en komplet materialebedømmelse uden at kontrollere resten af spektret.
• Antager, at det stærkeste bånd altid er det mest diagnostiske.
• At glemme, at forarbejdning, tilsætningsstoffer, ældning og blandinger kan flytte eller udvide forventede toppe.

Verifikationsrådgivning

Brug DSC, GC-MS eller TGA, når flere materialefamilier deler lignende bånd, eller når blandings-effekter gør FTIR-tildelingen usikker.

Litteratur bag disse tildelinger

• 1468 cm⁻¹ tillid 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 tillid 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
• 2965 cm⁻¹ tillid 1,0

  “The peak at 2965 corresponds to asymmetric stretching cm-1 vibrations of CH group in lipids, while band 1645 corresponds to C=O stretching 3 α-helix of proteins.”

  A Preliminary Study of FTIR Spectroscopy as a Potential Non-Invasive Screening Tool for Pediatric Precursor B Lymphoblastic Leukemia DOI: 10.3390/molecules
• 1709 cm⁻¹ tillid 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 tillid 1,0

  “LLM confirmed rule peak-group candidate”

  Depciuch 和 Parlinska-Wojtan - 2018 - Comparing dried and liquid blood serum samples of DOI: 10.1016/j.jpba.2017.11.074
• 2923 cm⁻¹ tillid 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 tillid 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 tillid 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.”

  Gao 等 - 2021 - Complementarity of FT-IR and Raman spectroscopies DOI: 10.1016/j.foodchem.2020.128754