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Gas Chromatography: Types of Detectors-II01:19

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In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...

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Synthesis of an Intein-mediated Artificial Protein Hydrogel
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A two-dimensional photonic hydrogel sensor driven by coordination competition for detecting histidine.

Mingyu Cui1, Yuqing Shi1, Jianwei Xin1

  • 1Key Laboratory of New Energy & New Functional Materials, School of Chemistry and Chemical Engineering, Yan'an University, Yan'an, Shaanxi, 716000, PR China.

Mikrochimica Acta
|January 17, 2026
PubMed
Summary

A novel Cu2+-coordination crosslinked photonic hydrogel sensor detects histidine (His) using a simple laser and ruler method. This smart sensor offers high sensitivity and selectivity for His detection in various samples.

Keywords:
Coordination competitionDebye diffraction ring diameterSmart photonic hydrogelTwo-dimensional photonic crystal

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Area of Science:

  • Materials Science
  • Chemical Sensing
  • Nanotechnology

Background:

  • Developing sensitive and selective sensors for biomolecules is crucial for diagnostics and environmental monitoring.
  • Photonic crystal hydrogels offer unique optical properties for sensing applications.
  • Coordination chemistry provides a versatile platform for designing responsive materials.

Purpose of the Study:

  • To construct a novel two-dimensional photonic crystal hydrogel sensor for sensitive histidine detection.
  • To investigate the coordination competition mechanism driving the hydrogel's response to histidine.
  • To evaluate the sensor's performance, including sensitivity, selectivity, stability, and real-world applicability.

Main Methods:

  • Fabrication of a Cu2+-coordinated hydrogel embedding a polystyrene two-dimensional photonic crystal.
  • Utilizing the coordination competition between Cu2+, histidine, and imidazole groups to induce hydrogel swelling.
  • Measuring changes in photonic crystal spacing via Debye diffraction ring diameter using a laser pointer and ruler.
  • Quantifying histidine concentrations based on the linear relationship between microsphere spacing and analyte concentration.

Main Results:

  • The developed sensor (PN-2DPCH-Cu2+) demonstrated highly sensitive and selective detection of histidine.
  • A low limit of detection of 9.6 nM was achieved, with linear responses across multiple concentration ranges.
  • The sensor exhibited good anti-interference, stability, and rapid response time (20 min).
  • Accurate histidine determination in milk and beverages confirmed the sensor's practical utility.

Conclusions:

  • The Cu2+-coordination crosslinked photonic hydrogel sensor provides a simple, sensitive, and reliable method for histidine detection.
  • The coordination competition strategy is effective for designing analyte-responsive hydrogel sensors.
  • This approach holds potential for developing sensors for various analytes by tuning material composition.