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Related Concept Videos

IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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 C=O, C=N, and C=C occur between 1600–1850 cm−1.
The...
Spectroscopy of Carboxylic Acid Derivatives01:26

Spectroscopy of Carboxylic Acid Derivatives

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 unsymmetrical carbonyl vibration.
In the...
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...
IR and UV–Vis Spectroscopy of Carboxylic Acids01:28

IR and UV–Vis Spectroscopy of Carboxylic Acids

In IR spectroscopy of carboxylic acids, the C=O bond shows a characteristic band between 1710 and 1760 cm⁻¹, and the O–H bond exhibits a broad band between 2500 and 3300 cm⁻¹.
However, the stretching absorptions for the C=O bond vary depending on the structure of carboxylic acids. The C=O bond of the free carboxylic acids shows a higher stretching frequency, 1760 cm−1, while H-bonded carboxylic acids (dimers) exhibit stretching absorptions at a lower frequency, 1710 cm−1. The C=O bond of the...
IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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High-definition Fourier Transform Infrared (FT-IR) Spectroscopic Imaging of Human Tissue Sections towards Improving Pathology
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[Gallstone biochemical characteristics using Fourier transform infrared spectroscopy method].

P Sossé Djessou1, A Aké Mondé, G Tiahou

  • 1Laboratoire de biochimie médicale, UFR des sciences médicales, Abidjan, Côte d'Ivoire.

Annales De Biologie Clinique
|February 12, 2010
PubMed
Summary

This study analyzed gallstones using infrared spectroscopy, finding pigment stones were most common, unlike European studies. This suggests diet and hemolysis influence gallstone composition in Côte d'Ivoire.

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Area of Science:

  • Biochemistry
  • Medical Spectroscopy

Context:

  • Gallstones affect a significant portion of the population.
  • Understanding gallstone composition is crucial for effective treatment and prevention strategies.
  • Previous research on gallstone composition has primarily focused on Caucasian populations.

Purpose:

  • To determine the biochemical composition and morphological aspects of gallstones in a population in Côte d'Ivoire.
  • To classify gallstones based on their composition using Fourier transform infrared spectroscopy (FTIR).
  • To compare the findings with existing literature, particularly studies from European regions.

Summary:

  • 24 patients (12 male, 12 female) underwent cholecystectomy, and their gallstones were analyzed using FTIR.
  • Gallstones were classified as pigment stones (n=12), cholesterol stones (n=8), or mixed stones (n=4).
  • Specific compositions included 100% cholesterol, 100% calcium bilirubinate, and various combinations of calcium bilirubinate phosphate, calcium carbonate, cholesterol, and proteins.

Impact:

  • Findings indicate a predominance of pigment stones in this population, contrasting with the cholesterol stone prevalence in Caucasian studies.
  • The results suggest that dietary factors and chronic hemolysis play a significant role in gallstone formation and biochemical composition.
  • FTIR is a valuable method for quantifying the quality and quantity of gallstone components, aiding in understanding disease etiology and prevention in specific regions.