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Related Concept Videos

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 25, 2026

Determination of Inorganic Arsenic in a Wide Range of Food Matrices using Hydride Generation - Atomic Absorption Spectrometry.
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Arsenic in Chinese Crayfish: Speciation Analysis, Cooking-Induced Stability, Bioaccessibility, and Dietary Risk

Xiaoyi Jiang1, Kai Peng1, Peng Li1

  • 1College of Food Science and Engineering, Collaborative Innovation Center for Modern Grain Circulation and Safety, Nanjing University of Finance and Economics, Nanjing 210023, China.

Foods (Basel, Switzerland)
|March 28, 2026
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Summary

Arsenic in Yangtze River crayfish is mostly low-toxicity organic forms. While cooking doesn't increase toxic arsenic, high intake may pose a carcinogenic risk, demanding careful food safety evaluation.

Keywords:
bioaccessibilitycrayfishinorganic arsenicrisk assessment

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Area of Science:

  • Environmental Science
  • Food Safety
  • Toxicology

Background:

  • Arsenic contamination in aquatic products poses a public health concern.
  • Crayfish consumption is widespread, necessitating an understanding of arsenic levels and risks.
  • Limited data exists on arsenic speciation, stability, and bioaccessibility in crayfish from the Yangtze River.

Purpose of the Study:

  • To comprehensively investigate arsenic speciation, processing stability, bioaccessibility, and health risks in Yangtze River crayfish.
  • To determine the predominant arsenic species and their toxicity profiles.
  • To assess the impact of cooking methods on arsenic forms and evaluate associated health risks.

Main Methods:

  • Analysis of 60 crayfish samples for total and inorganic arsenic concentrations.
  • Speciation analysis to identify different arsenic compounds.
  • In vitro gastrointestinal digestion to determine arsenic bioaccessibility.
  • Health risk assessment using U.S. EPA parameters.

Main Results:

  • Total arsenic concentrations ranged from 53.6 to 419.9 μg/kg (mean 109.3 μg/kg).
  • Predominantly low-toxicity organic arsenic (arsenobetaine) was found, with inorganic arsenic (iAs) comprising only 11.6% on average.
  • Cooking methods showed stability in arsenic speciation, though boiling in saline water reduced iAs by 28.2%.
  • High in vitro bioaccessibility of iAs (81.0-99.3%) was observed in the intestinal phase.
  • Non-carcinogenic risk was negligible, but carcinogenic risk exceeded acceptable thresholds for high-intake consumers of high-iAs crayfish.

Conclusions:

  • Yangtze River crayfish contain predominantly low-toxicity arsenic species.
  • Cooking methods generally do not increase toxic inorganic arsenic forms.
  • High bioaccessibility of inorganic arsenic and potential carcinogenic risks for specific consumer groups necessitate further food safety considerations.