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Indicators02:39

Indicators

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Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are...
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Perylene diimide-based indicator displacement assays.

Prabhpreet Singh1, Lalit Singh Mittal1,2, Kapil Kumar1,3

  • 1Department of Chemistry, UGC Centre for Advanced Studies-II, Guru Nanak Dev University, Amritsar 143001, Punjab, India. prabhpreet.chem@gndu.ac.in.

Chemical Communications (Cambridge, England)
|June 24, 2025
PubMed
Summary
This summary is machine-generated.

Perylene diimide (PDI) enables advanced indicator displacement assays (IDAs) for detecting diverse chemical and biological targets. This review highlights PDI-based IDA designs, properties, and sensing mechanisms for future research.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Biotechnology

Background:

  • Indicator displacement assays (IDAs) traditionally use analyte displacement for detection.
  • The scope of IDAs has expanded to incorporate metal complexes for enhanced sensing.
  • Perylene diimide (PDI) offers superior photophysical, electronic, self-assembly, stability, and biocompatibility.

Purpose of the Study:

  • To review the design and application of perylene diimide (PDI)-based indicator displacement assays (IDAs).
  • To explore the use of PDI in IDAs for detecting a wide range of chemical and biological species.
  • To provide a foundation for future research and development in PDI-based sensing technologies.

Main Methods:

  • Review of existing literature on PDI-based IDAs.
  • Analysis of PDI's photophysical, electronic, and self-assembly properties relevant to sensing.
  • Discussion of various sensing mechanisms and design strategies employed in PDI-IDAs.

Main Results:

  • PDI-based IDAs are effective for detecting diverse analytes including thiols, amines, polyphosphates, enzymes, proteins, DNA/RNA, mycotoxins, metal ions, and anions.
  • PDI's unique properties facilitate sensitive and selective detection through various optical mechanisms.
  • Successful integration of PDI in IDA designs showcases its versatility in chemical and biological sensing.

Conclusions:

  • Perylene diimide (PDI) is a highly versatile building block for designing advanced indicator displacement assays (IDAs).
  • PDI-based IDAs demonstrate significant potential for sensitive and selective detection across a broad spectrum of analytes.
  • This review provides insights into PDI-IDA design, optical properties, and sensing mechanisms, encouraging further innovation.