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Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography
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Inter-laboratory validation of bioaccessibility testing for metals.

Rayetta G Henderson1, Violaine Verougstraete2, Kim Anderson3

  • 1ToxStrategies, Inc., 9650 Strickland Rd., Suite 103-195, Raleigh, NC 27615, USA.

Regulatory Toxicology and Pharmacology : RTP
|July 1, 2014
PubMed
Summary
This summary is machine-generated.

Bioelution assays assess metal release in synthetic fluids. While some fluids show good reproducibility, inter-laboratory variability suggests protocol refinement is needed for accurate bioaccessibility data.

Keywords:
AlloysBioaccessibilityBioelutionClassificationInter-laboratory validationMetalsRead-acrossUVCBs

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Area of Science:

  • Environmental Science
  • Toxicology
  • Analytical Chemistry

Background:

  • Bioelution assays offer a rapid alternative to in vivo testing for assessing bioaccessibility.
  • Evaluating the variability of these assays is crucial for reliable toxicological risk assessment.

Purpose of the Study:

  • To assess the intra- and inter-laboratory variability of bioelution assays.
  • To evaluate bioaccessibility data in synthetic oral, inhalation, and dermal exposure fluids.
  • To identify areas for protocol improvement in bioelution testing.

Main Methods:

  • Five laboratories followed a single protocol to measure metal release from various metal compounds and alloys.
  • Standard deviations of repeatability (sr) and reproducibility (sR) were calculated.
  • Relative standard deviation (RSD) analysis was performed on the generated data.

Main Results:

  • Inter-laboratory reproducibility varied across different synthetic fluids; gastric and lysosomal fluids showed better concordance.
  • Overall variability was greater between laboratories than within laboratories.
  • Within-laboratory variability was generally good, except for some metals in interstitial fluid.

Conclusions:

  • Absolute bioaccessibility results can differ between laboratories, particularly in certain biological fluids.
  • The need for high inter-laboratory reproducibility in absolute metal releases may be reduced for applications requiring relative bioaccessibility.
  • The study highlights the need to address degrees of freedom within the bioelution assay protocol.