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Related Experiment Video

Updated: Apr 16, 2026

A Droplet-Based Microfluidic Approach and Microsphere-PCR Amplification for Single-Stranded DNA Amplicons
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Trading polymeric microspheres: exchanging DNA molecules via microsphere interaction.

Nobuyuki Morimoto1, Kanna Muramatsu1, Shin-Ichiro M Nomura2

  • 1Department of Materials Processing, Graduate School of Engineering, Tohoku University, 6-6-02 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8579, Japan.

Colloids and Surfaces. B, Biointerfaces
|March 4, 2015
PubMed
Summary

Researchers developed artificial molecular transport systems using self-assembling polymeric microspheres. These systems enable controllable DNA exchange between microspheres, paving the way for advanced microreactors and sensors.

Keywords:
Double strand formationMicrospheresSelf-assemblySingle-stranded DNA oligomerZwitterionic block copolymers

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Area of Science:

  • Polymer chemistry
  • Supramolecular chemistry
  • Nanotechnology

Background:

  • Polymeric microspheres offer potential for novel molecular transport systems.
  • Self-assembly is a key strategy for creating ordered nanostructures.
  • Controlled molecular exchange is crucial for applications like microreactors and sensors.

Purpose of the Study:

  • To construct a new class of artificial molecular transport system using polymeric microspheres.
  • To investigate the self-assembly behavior of poly(ethylene glycol)-block-poly(3-dimethyl(methacryloyloxyethyl)ammonium propane sulfonate) (PEG-b-PDMAPS) in water.
  • To demonstrate and control the exchange of encapsulated molecules between microspheres.

Main Methods:

  • Synthesis of PEG-b-PDMAPS via self-assembly driven by sulfobetaine interactions.
  • Encapsulation of 3'-TAMRA-labeled single-stranded DNA (ssDNA) into microspheres via thermal treatment.
  • Confirmation of ssDNA exchange using fluorescence resonance energy transfer (FRET) quenching with complementary 5'-BHQ-2-labeled ssDNA.
  • Control of exchange rate by tuning polymer composition.

Main Results:

  • Formation of stable polymeric microspheres (∼1μm) below the upper critical solution temperature (UCST).
  • Demonstration of ssDNA exchange between microspheres facilitated by partial and transient fusion.
  • Evidence of controllable ssDNA exchange rates by adjusting polymer composition.
  • Successful application of FRET to quantify molecular exchange.

Conclusions:

  • PEG-b-PDMAPS microspheres form a viable platform for artificial molecular transport.
  • The ssDNA exchange mechanism is controllable and tunable.
  • This system has potential applications in microreactors and sensor devices.