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A Polyaniline-based Sensor of Nucleic Acids
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Nanoparticle assembled microcapsules for application as pH and ammonia sensor.

Arlin Jose Amali1, Nour H Awwad, Rohit Kumar Rana

  • 1Nanomaterials Laboratory, I & PC Division, Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500607, India.

Analytica Chimica Acta
|November 19, 2011
PubMed
Summary
This summary is machine-generated.

We developed a robust pH sensor using encapsulated hydroxy pyrene trisulfonate (HPTS) within silica microcapsules. This novel material exhibits exceptional photostability, enabling accurate pH and ammonia measurements for environmental monitoring.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Molecular probes offer sensitive detection but suffer from photodegradation.
  • Developing robust sensing materials is crucial for reliable chemical analysis.

Purpose of the Study:

  • To create a photostable pH sensing material using encapsulated hydroxy pyrene trisulfonate (HPTS).
  • To demonstrate its application in physiological pH and ammonia determination.

Main Methods:

  • Encapsulation of HPTS within silica microcapsules formed by nanoparticle assembly.
  • Utilizing dual excitation fluorescence intensity for ratiometric pH sensing.
  • Assessing photostability under continuous irradiation.

Main Results:

  • The encapsulated HPTS exhibited extraordinary photostability, overcoming photo-bleaching issues.
  • A robust, fast, and simple ratiometric sensing scheme for pH (5.8-8.0) was established.
  • The sensor successfully determined ammonia concentrations (0-1.2 mM).

Conclusions:

  • Silica microcapsule encapsulation significantly enhances the photostability of molecular probes.
  • The developed sensor is suitable for accurate pH and ammonia monitoring in environmental applications.
  • Ratiometric fluorescence intensity provides a reliable detection method, while fluorescence lifetime remains insensitive to pH.