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Related Concept Videos

DNA Microarrays02:34

DNA Microarrays

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Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...
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Two-dimensional gel electrophoresis is a high-resolution protein separation method first introduced by O' Farrell and Klose in 1975. This method involves protein separation by two dimensions, mass and charge, making it more accurate than one-dimensional gel electrophoresis.
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Agarose gel electrophoresis is a laboratory technique commonly used to separate DNA fragments by size. However, it can also be used to isolate and purify DNA fragments using a gel extraction protocol.
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Electrophoresis: Overview01:20

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Electrophoresis is a powerful analytical separation technique that relies on the differential migration of charged species when subjected to an electric field. The core strength of electrophoresis lies in its ability to separate high-molecular-weight species in complex mixtures. It has found widespread use in biochemistry, molecular biology, and analytical chemistry, allowing the separation of compounds like amino acids, nucleotides, carbohydrates, and proteins with excellent resolution.
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Related Experiment Video

Updated: Apr 24, 2026

Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
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Electrophoretic and field-effect graphene for all-electrical DNA array technology.

Guangyu Xu1, Jeffrey Abbott1, Ling Qin2

  • 11] School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA [2].

Nature Communications
|September 6, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed graphene field-effect transistor arrays for sensitive, label-free DNA detection. This advancement enables site-specific DNA immobilization and detection, paving the way for all-electrical multiplexed DNA arrays.

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Area of Science:

  • Materials Science
  • Biotechnology
  • Nanotechnology

Background:

  • Field-effect transistor (FET) biosensors using low-dimensional nanomaterials offer high sensitivity and label-free detection.
  • Graphene, particularly from chemical vapor deposition (CVD), is suitable for electronic DNA array applications due to its large surface area.
  • Previous graphene FET DNA sensors primarily focused on single-device performance.

Purpose of the Study:

  • To develop field-effect transistor arrays from CVD graphene for multiplexed DNA sensing.
  • To achieve robust array yield and high sensitivity in graphene FET DNA sensors.
  • To explore graphene's dual role as an electrode for DNA immobilization and as a transistor for detection.

Main Methods:

  • Fabrication of field-effect transistor arrays using chemical vapor deposition graphene.
  • Characterization of array yield and transistor performance.
  • Demonstration of site-specific probe DNA immobilization and target DNA detection using electrophoretic methods.

Main Results:

  • Achieved a robust array yield of seven out of eight transistors.
  • Demonstrated a sensitivity of 100 femtomolar (fM), comparable to optical DNA microarrays.
  • Exhibited a sensitivity at least 10 times higher than previous CVD graphene transistor DNA sensors.
  • Utilized graphene as both an electrophoretic electrode for probe immobilization and as a FET for detection.

Conclusions:

  • The developed graphene FET arrays represent a significant step towards practical multiplexed DNA array applications.
  • The high sensitivity and robust yield meet the requirements for advanced biosensing platforms.
  • The dual functionality of graphene as electrode and transistor offers a pathway to all-electrical multiplexed graphene DNA arrays.