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Related Concept Videos

Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

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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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Intrinsic dual-emitting Si dots for high-precision and broad-range pH detection.

Chunmin Qiu1, Guoqiang Wu2, Puying Zhao3

  • 1College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China; Shenzhen Key Laboratory of Synthetic Genomics, Guangdong Provincial Key Laboratory of Synthetic Genomics, CAS Key Laboratory of Quantitative Engineering Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China.

Analytica Chimica Acta
|January 20, 2025
PubMed
Summary

Researchers developed simple, dual-emitting silicon dots for precise pH monitoring and urease detection. These fluorescent probes offer a versatile platform for biosensing and bioimaging in health assessments.

Keywords:
Cell imageDual-emitting Si dotsUreasepH detection

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Area of Science:

  • Materials Science
  • Biotechnology
  • Analytical Chemistry

Background:

  • Accurate pH monitoring is vital for understanding cellular processes and assessing health status.
  • Existing pH-responsive fluorescent probes often involve complex synthesis and suffer from reduced efficiency and stability.
  • There is a need for simple, stable, and highly sensitive pH detection methods.

Purpose of the Study:

  • To develop a straightforward method for preparing dual-emission silicon dots (Si dots) for high-precision, broad-range pH monitoring.
  • To explore the application of these Si dots in detecting urease activity.
  • To demonstrate the utility of Si dots for pH imaging in living cells.

Main Methods:

  • Synthesis of intrinsic dual-emitting Si dots with emission centers at 427 nm and 500 nm.
  • Characterization of Si dot fluorescence response across a wide pH range (3.0-12.0).
  • Quantification of urease activity using Si dots based on pH changes.
  • In vivo pH imaging in HeLa cells.

Main Results:

  • The Si dots exhibited distinct fluorescence changes at 427 nm and 500 nm in response to pH variations.
  • High-precision linear pH detection was achieved in the ranges of 7.0-9.5 and 10.0-12.0.
  • Urease detection demonstrated a linear range of 1-80 U/L with a low detection limit of 0.28 U/L.
  • Successful pH imaging in living HeLa cells, showing color changes corresponding to intracellular pH shifts.

Conclusions:

  • The developed intrinsic dual-emitting Si dots provide a simple and versatile platform for pH-related biosensing and bioimaging.
  • This method offers a reliable approach for preparing dual-emission probes and constructing fluorescence ratiometrics for health status assessment.
  • The Si dots show significant potential for applications in biological and medical fields requiring precise pH monitoring.