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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

970
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
970

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Related Experiment Video

Updated: Dec 14, 2025

Author Spotlight: Technologies and Challenges in Elemental Analysis of Food Samples
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Comparative analysis of lead content during food processing.

Joon-Goo Lee1, Jeong-Yun Hwang1, Hye-Eun Lee1

  • 1Food Contaminants Division, Department of Food Safety Evaluation, National Institute of Food and Drug Safety Evaluation, Ministry of Food and Drug Safety, Osong-eup, Heungdeok-gu, Cheongju-si, 28159 South Korea.

Food Science and Biotechnology
|July 17, 2020
PubMed
Summary

Proper food processing significantly reduces lead (Pb) exposure. Techniques like alcohol extraction and blanching can decrease Pb levels in foods, making them safer for consumption.

Keywords:
ExposureFood processingLeadMigration rateResidual rate

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Area of Science:

  • Environmental Science
  • Food Science
  • Analytical Chemistry

Background:

  • Heavy metals, including lead (Pb), are naturally occurring elements found in the Earth's crust.
  • Human exposure to heavy metals occurs through inhalation of polluted air and consumption of contaminated food.
  • Lead (Pb) is a ubiquitous environmental contaminant that bioaccumulates in plants and animals, posing a risk through the food chain.

Purpose of the Study:

  • To quantify the reduction of lead (Pb) in various food items after different processing and cooking methods.
  • To assess the effectiveness of specific food preparation techniques in mitigating Pb contamination.
  • To validate the analytical method used for Pb determination in food samples.

Main Methods:

  • Inductively Coupled Plasma Mass Spectrometry (ICP-MS) was employed to analyze lead (Pb) content in food samples before and after processing.
  • The analytical method was validated for accuracy, linearity, recovery, and repeatability.
  • Various food processing techniques were applied, including alcohol extraction, blanching, brewing, juice extraction, and peeling.

Main Results:

  • The analytical method demonstrated high accuracy with a regression coefficient of 0.999 and acceptable recoveries (78.1-89.9%).
  • Alcohol extraction of ginseng, red ginseng, and balloon flower roots reduced Pb by over 79.6%.
  • Blanching Chwinamul reduced Pb by more than 47.9%, brewing coffee reduced Pb by over 18.2%, and fruit extraction/peeling reduced Pb by over 22.2%.

Conclusions:

  • Specific food processing and cooking methods can significantly reduce lead (Pb) levels in contaminated foods.
  • Techniques such as alcohol extraction, blanching, and peeling are effective in minimizing dietary exposure to lead (Pb).
  • Implementing proper food preparation strategies is crucial for reducing public health risks associated with heavy metal contamination.