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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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Direct Detection of the Acetate-forming Activity of the Enzyme Acetate Kinase
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Spectroelectrochemical Enzyme Sensor System for Acetaldehyde Detection in Wine.

David Ibáñez1, María Begoña González-García1, David Hernández-Santos1

  • 1Metrohm DropSens S.L., Vivero de Ciencias de la Salud, C/Colegio Santo Domingo de Guzmán s/n, 33010 Oviedo (Asturias), Spain.

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|November 24, 2022
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Summary
This summary is machine-generated.

A novel spectroelectrochemical sensor accurately detects acetaldehyde in wine. This two-enzyme system uses optical and electrochemical signals to avoid wine interferents, ensuring precise acetaldehyde quantification.

Keywords:
acetaldehydealdehyde dehydrogenasediaphorasescreen-printed electrodes (SPEs)spectroelectrochemistry

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Electrochemistry

Background:

  • Wine analysis requires accurate detection of acetaldehyde, a key volatile compound.
  • Existing methods for acetaldehyde detection can be affected by interferents present in wine, such as polyphenols.
  • Developing selective and sensitive detection methods is crucial for wine quality control.

Purpose of the Study:

  • To develop a novel spectroelectrochemical two-enzyme sensor system for the selective detection of acetaldehyde in wine.
  • To leverage the combined advantages of spectroscopy and electrochemistry for improved analytical performance.
  • To overcome limitations of existing methods by minimizing interference from wine matrix components.

Main Methods:

  • A two-enzyme system involving aldehyde dehydrogenase and diaphorase was employed.
  • The K3[Fe(CN)6]/K4[Fe(CN)6] redox couple was utilized as an electron mediator.
  • Spectroelectrochemical detection was performed by monitoring UV-vis absorption bands of the redox couple.
  • Acetaldehyde concentration was correlated with changes in the optical properties of the K3[Fe(CN)6]/K4[Fe(CN)6] system.

Main Results:

  • The developed sensor system demonstrated selective detection of acetaldehyde.
  • Optical information from the K3[Fe(CN)6]/K4[Fe(CN)6] redox couple was directly linked to acetaldehyde oxidation.
  • The method successfully avoided interference from common wine components like polyphenols.
  • Characteristic UV-vis bands at 310 and 420 nm of K3[Fe(CN)6] were used for quantification.

Conclusions:

  • The novel spectroelectrochemical sensor offers a robust platform for acetaldehyde detection in wine.
  • The combination of spectroscopy and electrochemistry enhances selectivity and accuracy.
  • This method provides a promising approach for reliable wine analysis, minimizing matrix effects.