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IR Frequency Region: Fingerprint Region

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range.
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IR and UV–Vis Spectroscopy of Aldehydes and Ketones01:29

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Infrared spectroscopy, also known as vibrational spectroscopy, is mainly used to determine the types of bonds and functional groups in molecules. In aldehydes and ketones, the carbonyl (C=O) bond shows an absorption around 1710 cm-1. The C=O bond vibration of an aldehyde occurs at lower frequencies than that of a ketone. In addition to the C=O absorption in an aldehyde, the aldehydic C–H bond also gives two peaks in the 2700–2800 cm-1 range. This absorption, coupled with the...
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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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Infrared spectroscopy is primarily used to determine the types of bonds and functional groups. In carboxylic acid derivatives, a typical carbonyl bond absorption is observed around 1650–1850 cm−1. For esters, the absorption is recorded at around 1740 cm−1, while acid halides show the absorption at about 1800 cm−1. Another acid derivative, the acid anhydrides, exhibit two carbonyl absorption around 1760 cm−1 and 1820 cm−1, arising from the symmetrical and...
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¹H NMR Signal Integration: Overview00:58

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The intensity of a signal, which can be represented by the area under the peak, depends on the number of protons contributing to that signal. The area under each peak is shown as a vertical line called an integral, with the integral value listed under it, as seen in the proton NMR spectrum of benzyl acetate. Each integral value is divided by the smallest integral value to obtain the ratio of the number of protons producing each signal. The ratio reveals the relative number of protons and not...
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Data-Driven FTIR Spectroscopy for the Discrimination of Nectars.

Aleksandra Szaniawska1, Justyna Grzeda1, Johannes Binder2

  • 1Faculty of Chemistry, University of Warsaw, Pasteura 1 Str., 02-093 Warsaw, Poland.

Molecules (Basel, Switzerland)
|October 29, 2025
PubMed
Summary

Fourier-transform infrared (FTIR) spectroscopy effectively distinguishes nectar from different plant species. This rapid, non-destructive method aids in ecological research and food authentication.

Keywords:
ATREchium vulgareFTIRHedera helixIR spectroscopychemometricsnectarprincipal component analysis

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Area of Science:

  • Analytical Chemistry
  • Plant Science
  • Ecology

Background:

  • Nectar composition is crucial for plant-pollinator interactions and honey quality.
  • Limited reliable methods exist for differentiating nectar from various sources.
  • Urban environments present unique challenges and opportunities for nectar studies.

Purpose of the Study:

  • To evaluate Fourier-transform infrared (FTIR) spectroscopy for nectar discrimination.
  • To differentiate nectar samples from *Echium vulgare* and *Hedera helix* in urban settings.
  • To identify key spectral regions and preprocessing methods for effective nectar analysis.

Main Methods:

  • Fourier-transform infrared (FTIR) spectroscopy was employed for nectar analysis.
  • Chemometric techniques, including Principal Component Analysis (PCA), were used for data interpretation.
  • Various spectral preprocessing strategies were tested to optimize discrimination.

Main Results:

  • FTIR spectroscopy, combined with simple preprocessing (e.g., Savitzky-Golay smoothing), successfully differentiated nectar samples.
  • The carbohydrate fingerprint (1200-950 cm-1) and C-H stretching zone (2935-2885 cm-1) were the most discriminative spectral regions.
  • Variability in nectar spectra was attributed to carbohydrate content, solvent type, biological matrix, and environmental factors.

Conclusions:

  • FTIR spectroscopy offers a rapid, non-destructive, and robust method for nectar discrimination.
  • This technique has significant potential for applications in food authentication, ecological research, and pollinator-plant studies.
  • Understanding nectar variability is key for accurate species identification and ecological assessments.