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Related Concept Videos

Indicators02:39

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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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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
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Updated: Mar 13, 2026

Author Spotlight: Quantitative Characterization of Liquid Photosensitive Bioink Properties for Continuous Digital Light Processing Based Printing
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Inkjet-printed CO2 colorimetric indicators.

Yanan Zhang1, Loong-Tak Lim1

  • 1Department of Food Science, University of Guelph, ON, Canada N1G2W1.

Talanta
|October 23, 2016
PubMed
Summary
This summary is machine-generated.

New colorimetric carbon dioxide (CO2) indicators were developed using inkjet printing. Paper-based indicators show higher sensitivity and color change for CO2 detection, enabling potential use in smart food packaging.

Keywords:
Carbon dioxideColorimetric indicatorsInkjet-printedIntelligent packagingMultiplexing

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Food Science

Background:

  • Carbon dioxide (CO2) is a crucial indicator of product quality in various food items.
  • Developing sensitive and accessible methods for CO2 detection is essential for food quality monitoring.
  • Colorimetric indicators offer a visual and potentially low-cost approach for gas sensing.

Purpose of the Study:

  • To develop novel colorimetric CO2 indicators utilizing inkjet printing technology.
  • To investigate the performance of indicators printed on different substrates (paper vs. plastic).
  • To explore the potential for tunable sensitivity and expanded detection ranges through multiplexing.

Main Methods:

  • Preparation of indicator inks using pH dyes (M-cresol purple, phenol red), additives, and a solvent system.
  • Application of inks onto cellulose paper and plastic transparency film using a commercial thermal inkjet printer.
  • Characterization of indicator sensitivity, color change, and reproducibility in response to CO2.

Main Results:

  • Inkjet-printed indicators on cellulose paper exhibited superior CO2 sensitivity and color change compared to those on plastic film.
  • Multiplexing pH dyes by varying print intensity allowed for tunable indicator sensitivity and a broader CO2 detection range.
  • The developed method is simple, flexible, and demonstrates potential for scalable indicator production.

Conclusions:

  • Inkjet printing provides a versatile platform for fabricating effective colorimetric CO2 indicators.
  • Paper-based indicators show promise for CO2 sensing applications, particularly in food quality assessment.
  • Further development could lead to integration into intelligent food packaging systems for real-time monitoring.