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Related Concept Videos

Sample Preparation for Analysis: Overview01:21

Sample Preparation for Analysis: Overview

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Sample preparation is an essential step in the analytical process. It involves preparing a sample so that it can be analyzed accurately. The goal is to extract the analyte, the substance you want to measure, from the sample while removing any components that may interfere with the analysis. Sample preparation techniques vary depending on the physical state of the sample.
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Aromatic Compounds: Overview01:25

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In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
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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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Updated: Nov 27, 2025

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Polycyclic aromatic hydrocarbons in coffee samples: Enquiry into processes and analytical methods.

Arianna Binello1, Giancarlo Cravotto1, Janet Menzio1

  • 1Dipartimento di Scienza e Tecnologia del Farmaco, University of Turin, via P. Giuria 9, 10235 Turin, Italy.

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|December 2, 2020
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Summary

Polycyclic aromatic hydrocarbons (PAHs) are potentially genotoxic pollutants found in coffee, mainly from roasting. Controlling PAHs in coffee is crucial for human safety due to potential health risks.

Keywords:
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Area of Science:

  • Food Chemistry
  • Environmental Health
  • Toxicology

Background:

  • Polycyclic aromatic hydrocarbons (PAHs) are environmental pollutants linked to genotoxicity and carcinogenicity.
  • PAHs in coffee originate from incomplete combustion, environmental contamination, and significantly, from the roasting process.
  • While coffee is widely consumed, its potential contribution to human PAH intake necessitates a thorough understanding of contamination sources.

Purpose of the Study:

  • To review and discuss current knowledge and recent advancements regarding the formation of PAHs during coffee roasting.
  • To analyze literature on extraction, purification, and analytical chromatographic methods for detecting PAHs in coffee powder and brews.
  • To highlight the importance of controlling PAHs throughout the coffee production chain for consumer safety.

Main Methods:

  • Literature review focusing on PAH formation during coffee roasting.
  • Analysis of extraction and purification techniques for PAHs in coffee matrices.
  • Evaluation of chromatographic methods (e.g., GC-MS, HPLC) for PAH quantification in coffee powder and beverages.

Main Results:

  • Roasting is a primary source of PAHs in coffee, influenced by factors like temperature, time, and bean type.
  • Various analytical methods exist for PAH detection, with varying efficiencies for different coffee forms (powder vs. brew).
  • Coffee consumption can contribute to daily human exposure to PAHs, underscoring the need for monitoring.

Conclusions:

  • The formation of PAHs during coffee roasting is a significant concern for food safety.
  • Comprehensive control across the coffee production chain, from bean to brew, is essential to minimize human exposure to PAHs.
  • Further research and regulatory standards for PAHs in coffee are desirable to ensure the safety of this popular commodity.