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Related Concept Videos

The Periodic Table and Organismal Elements01:27

The Periodic Table and Organismal Elements

Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally occurring, and only a few of them are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.
Periodic Table Provides Information...
Types of Toxins01:36

Types of Toxins

Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
Toxic Reactions: Overview01:26

Toxic Reactions: Overview

When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
Bioactivation and Tissue Toxicity01:25

Bioactivation and Tissue Toxicity

Bioactivation is a metabolic process that transforms less reactive substances into highly reactive metabolites, initiating tissue toxicity. This transformation can lead to various toxic effects, including carcinogenesis and teratogenesis. Reactive metabolites are classified into two main types: electrophiles and free radicals.Electrophiles are electron-deficient species and are produced primarily by the enzyme cytochrome P-450 during the metabolism of compounds containing carbon, nitrogen, or...
Toxicokinetics: Overview01:21

Toxicokinetics: Overview

Studies that assess how a drug is absorbed, distributed, metabolized, and excreted (ADME) at toxic doses are termed toxicokinetics. Understanding toxicokinetics helps predict adverse drug reactions (ADRs) and manage toxicity in humans.Toxicokinetics differs from pharmacokinetics mainly in the dose levels studied, with toxicokinetics focusing on higher toxic doses. The kinetics at these levels can be non-linear due to altered physiological processes. Toxicodynamics examines the relationship...
Toxicity Testing in Animals01:23

Toxicity Testing in Animals

Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...

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Related Experiment Video

Updated: Jun 20, 2026

A High-throughput Assay for the Prediction of Chemical Toxicity by Automated Phenotypic Profiling of Caenorhabditis elegans
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A High-throughput Assay for the Prediction of Chemical Toxicity by Automated Phenotypic Profiling of Caenorhabditis elegans

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Analysis of food for toxic elements.

Stephen G Capar1, William R Mindak, John Cheng

  • 1U.S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, Harvey W. Wiley Federal Building, 5100 Paint Branch Parkway, College Park, MD 20740-3835, USA. stephen.capar@fda.hhs.gov

Analytical and Bioanalytical Chemistry
|July 5, 2007
PubMed
Summary

Monitoring toxic elements like arsenic and mercury in food is crucial for consumer safety. Recent advancements focus on improving analytical methods for more accurate and sensitive food analysis, including chemical forms.

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Area of Science:

  • Food safety and analytical chemistry.
  • Environmental monitoring and toxicology.

Background:

  • Routine monitoring of toxic elements (Al, As, Cd, Hg, Pb, Sn) in food is essential for consumer protection.
  • Increasing focus on analyzing the chemical forms of arsenic (As) and mercury (Hg) in food.
  • Analytical methods are continuously evolving to meet demands for lower detection limits and broader food matrices.

Purpose of the Study:

  • To review recent advancements in the analysis of toxic elements in food.
  • To highlight improvements in contamination control, sample preparation, and analytical techniques.

Main Methods:

  • Review of recent scientific literature on toxic element analysis in food.
  • Focus on contamination control strategies.
  • Discussion of advanced analytical sample treatment techniques.
  • Overview of common and emerging analytical techniques.

Main Results:

  • Improvements in contamination control minimize analytical errors.
  • Enhanced sample preparation techniques improve analyte recovery and reduce matrix effects.
  • Advances in analytical instrumentation allow for lower detection limits and speciation analysis.
  • The review covers a range of techniques applicable to diverse food types.

Conclusions:

  • Continuous improvement in analytical methodologies is vital for accurate toxic element assessment in food.
  • Enhanced methods ensure better consumer protection and reliable background level data.
  • Future work will likely focus on further reducing detection limits and expanding speciation analysis.