Carbon dots from PEG for highly sensitive detection of levodopa

Area of Science:

• Nanomaterials Science
• Biochemistry
• Analytical Chemistry

Background:

• Levodopa (l-DOPA) detection is crucial for Parkinson's disease monitoring.
• Existing detection methods can be time-consuming or require complex sample preparation.
• Fluorescent carbon dots (CDs) offer unique optical properties for biosensing applications.

Purpose of the Study:

• To develop a highly sensitive and efficient fluorescent probe for l-DOPA detection.
• To utilize the synergistic properties of carbon dots (CDs) and tyrosinase (TYR) in a novel biosensor.
• To establish a rapid and stable detection method for l-DOPA.

Main Methods:

• Hybridization of high-intensity fluorescent carbon dots (CDs) with tyrosinase (TYR) to create a fluorescent probe.
• Direct detection of l-DOPA using the CD-TYR hybrid probe without enzyme modification or immobilization.
• Characterization of the probe's performance, including detection limit, linear range, selectivity, and stability.
• Comparison of results with established clinical fluorescence and high-performance liquid chromatography (HPLC) methods.

Main Results:

• The CD-TYR hybrid probe demonstrated efficient, fast, stable, and sensitive detection of l-DOPA.
• Achieved a low detection limit of 9.0 × 10^-8 mol L^-1 for l-DOPA within a wide linear range.
• Selective detection attributed to the electron-accepting/donating properties and H⁺ adsorption capacity of CDs.
• Test results were comparable to current clinical fluorescence and HPLC methods.

Conclusions:

• The developed CD-TYR fluorescent probe provides a promising platform for rapid and sensitive l-DOPA detection.
• Carbon dots (CDs) exhibit significant potential for the development of various enzyme-based biosensors.
• The direct use of tyrosinase (TYR) simplifies the biosensor design and application.