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MoS2/S@g-CN Composite Electrode for L-Tryptophan Sensing.

Theophile Niyitanga1, Aarti Pathak2, Archana Chaudhary2,3

  • 1School of Materials Science and Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea.

Biosensors
|November 24, 2023
PubMed
Summary

This study introduces a novel electrochemical sensor for detecting L-tryptophan (L-TRP), an essential amino acid. The sensor, utilizing a MoS2/S@g-CN modified electrode, offers a sensitive and stable method for L-TRP quantification.

Keywords:
L-tryptophanMoS2/S@g-C3N4cyclic voltammetrydifferential pulse voltammetry (DPV)sensors

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • L-tryptophan (L-TRP) is an essential amino acid crucial for human nitrogen balance.
  • Accurate quantification of L-TRP is vital for nutritional and health monitoring.
  • Existing detection methods may lack sensitivity, stability, or selectivity.

Purpose of the Study:

  • To develop and characterize a novel electrochemical sensor for sensitive L-tryptophan detection.
  • To synthesize and analyze a molybdenum disulfide/sulfur-g-carbon nitride (MoS2/S@g-CN) composite.
  • To evaluate the performance of the modified electrode for L-TRP quantification.

Main Methods:

  • Hydrothermal synthesis of the MoS2/S@g-CN composite.
  • Characterization using PXRD, SEM, XPS, and EDX.
  • Fabrication of a MoS2/S@g-CN modified glassy carbon electrode (GC).
  • Electrochemical detection of L-TRP using cyclic voltammetry (CV) and differential pulse voltammetry (DPV).

Main Results:

  • The MoS2/S@g-CN composite exhibited porous ball structures with MoS2 decorated on S@g-CN.
  • XPS confirmed the presence of Mo, S, O, C, and N elements.
  • The modified electrode achieved a low limit of detection (LoD) of 0.03 µM for L-TRP.
  • High sensitivity (1.74 µA/µMcm²), stability, repeatability, and selectivity were demonstrated.

Conclusions:

  • The developed MoS2/S@g-CN/GC electrode is a highly effective platform for electrochemical L-TRP detection.
  • The sensor offers significant advantages in terms of sensitivity, stability, and selectivity.
  • This approach provides a promising tool for quantifying essential amino acids in biological samples.