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Related Concept Videos

Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a result, EDTA...

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Use of a Filter Cartridge for Filtration of Water Samples and Extraction of Environmental DNA
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Recovering Historical eDNA From Museum-Preserved Filter Feeders via Non-Destructive Metabarcoding.

Gert-Jan Jeunen1,2, Sadie Mills3, Marc Bailie4

  • 1School of Biological and Marine Sciences, University of Plymouth, Plymouth, Devon, UK.

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|March 30, 2026
PubMed
Summary
This summary is machine-generated.

Extracting environmental DNA (eDNA) from ethanol museum preservatives offers a non-destructive method for biodiversity assessments. This technique matches or exceeds tissue biopsy effectiveness for historical eDNA recovery from filter-feeding specimens.

Keywords:
BryozoaPoriferaeDNAethanol DNA extractionmetabarcodingmetagenomics

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Area of Science:

  • Molecular Biology
  • Museum Studies
  • Ecology

Background:

  • Museum specimens are valuable for molecular research, but destructive DNA extraction methods limit their utility.
  • Metagenomic and metabarcoding techniques enhance the use of museum collections.
  • Non-destructive DNA extraction is crucial due to finite specimen availability.

Purpose of the Study:

  • To evaluate the feasibility of extracting historical environmental DNA (eDNA) from ethanol preservatives of museum specimens.
  • To compare various DNA extraction methods for their efficiency in recovering eDNA.
  • To assess eDNA recovery across different filter-feeding taxa.

Main Methods:

  • Compared centrifugation, evaporation, filtration, and precipitation extraction methods.
  • Used ten replicate samples per treatment for statistical analysis.
  • Included bryozoan, demosponge, and glass sponge specimens for cross-taxa comparison.

Main Results:

  • Ethanol filtration (10 mL) performed comparably to or better than tissue biopsies for historical eDNA recovery.
  • 16S rRNA metabarcoding of Antarctic fish revealed equal or greater species detection (α-diversity) and community characterization (β-diversity) using ethanol-derived eDNA.
  • Demonstrated successful eDNA recovery from filter-feeding specimens stored in ethanol.

Conclusions:

  • Ethanol preservative is a viable, non-destructive source of historical eDNA from museum-stored filter-feeding specimens.
  • Non-destructive sampling preserves specimen integrity while enabling biodiversity assessments.
  • Further refinement of eDNA extraction methods can broaden applicability across taxa and collection types.