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Related Concept Videos

Radical Chain-Growth Polymerization: Overview01:10

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Related Experiment Video

Updated: Jan 28, 2026

Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Ultrasensitive DNA biosensor based on electrochemical atom transfer radical polymerization.

Haobo Sun1, Yunliang Qiu2, Qianrui Liu3

  • 1Research Center for Biomedical and Health Science, Anhui Science and Technology University, Fengyang 233100, PR China; School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China.

Biosensors & Bioelectronics
|March 6, 2019
PubMed
Summary

This study presents a novel DNA biosensor using electrochemical atom transfer radical polymerization (ATRP) and Click Chemistry for ultrasensitive detection. The advanced biosensor achieves remarkable sensitivity for identifying target DNA (T-DNA) biomarkers.

Keywords:
Click reactionDNAElectrochemical biosensorSI-eATRPSignal amplification

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Area of Science:

  • Electrochemistry
  • Biotechnology
  • Materials Science

Background:

  • DNA biosensors are crucial for detecting biomarkers.
  • Existing methods often lack sufficient sensitivity and selectivity.
  • Signal amplification strategies are needed for enhanced detection.

Purpose of the Study:

  • To develop a highly selective and ultrasensitive DNA biosensor.
  • To utilize electrochemical atom transfer radical polymerization (ATRP) and Click Chemistry for signal amplification.
  • To enable sensitive detection of target DNA (T-DNA).

Main Methods:

  • Immobilization of modified hairpin DNA on a gold electrode.
  • Hybridization with target DNA to open hairpin structure.
  • Initiation of ATRP via Click reaction for signal amplification.
  • Quantification using square wave voltammetry.

Main Results:

  • The DNA biosensor demonstrated high selectivity and ultrasensitivity.
  • Detection limit achieved was as low as 0.2 aM for T-DNA.
  • Successful preliminary detection of target DNA in spiked serum samples.

Conclusions:

  • The developed DNA biosensor shows great promise for detecting gene biomarkers.
  • The combination of ATRP and Click Chemistry provides effective signal amplification.
  • This approach offers a sensitive platform for future diagnostic applications.