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Related Concept Videos

iChip01:24

iChip

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The cultivation of environmental microorganisms has long been hindered by the inability to replicate complex native conditions in vitro. The isolation chip (iChip) addresses this limitation by facilitating the growth of previously uncultivable microorganisms through in situ incubation. Designed for high-throughput microbial cultivation, the iChip comprises hundreds of microchambers, each capable of housing a single microbial cell. These microchambers are loaded with a mixture of molten agar and...
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DNA Isolation01:24

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DNA isolation protocols can be fast and straightforward or complex and time-consuming depending on the type and quality of DNA required for further processing. For example, plasmid DNA extraction is a bit more complicated than genomic DNA extraction because of the need for an appropriate lysis method to separate plasmid DNA from gDNA during isolation. However, for specific applications, such as long-range DNA sequencing that require a good yield of high- quality DNA samples, we need to follow...
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DNA Isolation01:34

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DNA from cells is required for many biotechnology and research applications, such as molecular cloning. To remove and purify DNA from cells, researchers use various methods of DNA extraction. While the specifics of different protocols may vary, some general concepts underlie the process of DNA extraction.
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Related Experiment Video

Updated: May 1, 2026

Isolation of Soil Microorganisms Using iChip Technology
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Nucleic Acid Isolation and Enrichment on a Microchip.

Jinho Kim1, John P Hilton1, Kyung A Yang2

  • 1Department of Mechanical Engineering, Columbia University, New York, NY 10027.

Sensors and Actuators. A, Physical
|April 15, 2014
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Summary

This microchip uses solid-phase extraction and electrophoresis to isolate and enrich specific single-stranded DNA (ssDNA) from complex mixtures. It shows potential for highly sensitive detection in biological samples.

Keywords:
Solid-phase extractionelectrophoresishuman immunoglobulin EmicrochannelssDNA

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Area of Science:

  • Biotechnology
  • Analytical Chemistry
  • Microfluidics

Background:

  • Detecting specific single-stranded DNA (ssDNA) in complex biological samples is challenging due to low concentrations and interfering substances.
  • Existing methods for ssDNA isolation and enrichment often lack the sensitivity and efficiency required for dilute samples.

Purpose of the Study:

  • To develop and demonstrate a novel microchip for the isolation and enrichment of target-binding ssDNA.
  • To enhance the sensitivity of ssDNA detection methods for applications in biological and medical diagnostics.

Main Methods:

  • A microfluidic device combining solid-phase extraction with electrophoresis was designed.
  • Target-functionalized microbeads (human immunoglobulin E) were used to capture specific ssDNA.
  • An integrated heater and electric potential difference facilitated ssDNA elution and electrophoretic separation within microchambers connected by an agarose gel channel.

Main Results:

  • The microchip successfully captured and enriched ssDNA with binding affinity to human immunoglobulin E from a randomized DNA mixture.
  • Experimental results validated the microchip's capability to isolate and concentrate target ssDNA, demonstrating significant enrichment.

Conclusions:

  • The developed microchip effectively isolates and enriches target-binding ssDNA using a combination of microfluidic techniques.
  • This technology holds promise for improving the sensitivity of ssDNA detection in challenging biological matrices.