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Extraction: Advanced Methods

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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 formed in...

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Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography

Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography

Published on: January 17, 2020

DNAzyme-based microarray for highly sensitive determination of metal ions.

Peng Zuo¹, Bin-Cheng Yin, Bang-Ce Ye

¹Department of Food Engineering and Science, East China University of Science and Technology, Shanghai 200237, China.

Biosensors & Bioelectronics

|September 11, 2009

Summary

A new DNAzyme microarray offers sensitive detection of heavy metals like copper and lead in water. This high-throughput method provides accurate environmental monitoring for public health and safety.

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Area of Science:

Biotechnology
Environmental Science
Analytical Chemistry

Background:

Heavy metal contamination poses significant risks to environmental and human health.
Existing detection methods often lack the sensitivity, selectivity, or throughput required for comprehensive monitoring.

Purpose of the Study:

To develop a novel microarray for the simultaneous detection of heavy metal ions in aqueous solutions.
To leverage DNAzyme activity and microarray technology for enhanced sensitivity and high-throughput analysis.

Main Methods:

Immobilization of metal ion-dependent DNAzymes (Cu-Enz, Pb-Enz) and their corresponding DNA substrates (Cu-Sub, Pb-Sub) on aldehyde-coated slides.
Utilizing the DNA cleavage activity triggered by specific metal ions (Cu2+, Pb2+) to induce changes in fluorescent signal intensity.
Employing microarray technology for multiplexed and parallel detection of target analytes.

Main Results:

Achieved high sensitivity with detection limits of 0.6 ppb for Cu2+ and 2 ppb for Pb2+.
Demonstrated good selectivity and efficiency for multiplexed heavy metal ion determination.
The method showed sufficient sensitivity for detecting heavy metals in drinking water.

Conclusions:

The developed DNAzyme microarray offers a sensitive, selective, and high-throughput platform for heavy metal detection.
This approach holds significant potential for applications in environmental monitoring, food safety, and clinical toxicology.
Combines the specificity of DNAzymes with the parallel processing capabilities of microarrays for efficient analysis.