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Related Concept Videos

Qualitative Analysis01:10

Qualitative Analysis

Qualitative analysis is the process of identifying elements, ions, or compounds in an unknown sample. It is the first and most fundamental type of analysis based on the hierarchy of analytical goals. This hierarchy is significant as it provides a structured approach to scientific research, with qualitative analysis serving as the initial step, providing essential information before moving on to quantitative or other forms of analysis.
There are two main approaches to qualitative analysis:...
EDTA: Indirect and Alkalimetric Titration01:23

EDTA: Indirect and Alkalimetric Titration

Unlike direct titration, back-titration, and displacement titration, indirect titration is an EDTA titration method for quantifying anions. In the indirect titration method, anions are precipitated as their insoluble salts with excess metal ions. The filtrate containing the excess metal ions is directly titrated with standard EDTA until the endpoint is achieved. Another approach involves extracting the metal ion and back-titrating with standard EDTA to obtain the endpoint. In this way, the...
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...
Voltammetry: Stripping Methods01:13

Voltammetry: Stripping Methods

Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...

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Chromatographic Fingerprinting by Template Matching for Data Collected by Comprehensive Two-Dimensional Gas Chromatography
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Virgin olive oil ortho-phenols--electroanalytical quantification.

Teodor Adrian Enache1, Aziz Amine, Christopher M A Brett

  • 1Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, 3004-535 Coimbra, Portugal.

Talanta
|April 20, 2013
PubMed
Summary

A new electroanalytical method accurately measures virgin olive oil (VOO) freshness by quantifying ortho-phenol content. This method uses screen-printed electrodes to determine hydroxytyrosol (HT) equivalents, reflecting VOO quality over time.

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Area of Science:

  • Analytical Chemistry
  • Electrochemistry
  • Food Science

Background:

  • Virgin olive oil (VOO) quality is linked to its ortho-phenol content, which diminishes with age.
  • Accurate quantification of ortho-phenols is crucial for assessing VOO freshness and authenticity.

Purpose of the Study:

  • To develop a sensitive and reproducible electroanalytical method for determining total ortho-phenol content in VOO.
  • To establish a correlation between ortho-phenol levels and VOO age, expressed as hydroxytyrosol (HT) equivalents.

Main Methods:

  • Utilized screen-printed electrodes (SPEs) with cyclic voltammetry (CV) and square wave voltammetry (SWV).
  • Investigated the electrochemical oxidation of various phenolic compounds, including hydroxytyrosol (HT).
  • Applied the developed method to analyze fresh and aged VOO samples.

Main Results:

  • Achieved a low detection limit of 0.40 μM for HT using SPEs and SWV.
  • Demonstrated a clear decrease in HT equivalents with VOO age: 30 mg/kg for fresh, 6-7 mg/kg for 1-year-old, and 3 mg/kg for 2-year-old VOO.
  • Obtained recovery rates of 78-93% for HT standards, indicating method reliability.

Conclusions:

  • The developed electroanalytical methodology offers a sensitive and reproducible means to assess VOO freshness via ortho-phenol determination.
  • The method effectively differentiates VOO based on age, providing a quantitative measure of quality decline.
  • SPEs provide a viable platform for routine quality control of virgin olive oil.