Metal-organic framework biosensor with high stability and selectivity in a bio-mimic environment.

Area of Science:

• Materials Science
• Electrochemistry
• Biochemistry

Background:

• Metal-organic frameworks (MOFs) offer tunable properties for sensing applications.
• Electrochemical detection is a sensitive method for analyzing biomolecules.
• Ascorbic acid (AA) and L-tryptophan (L-Trp) are important biological molecules with clinical relevance.

Purpose of the Study:

• To develop a water-stable copper-based MOF for electrochemical sensing.
• To investigate the MOF's capability for detecting ascorbic acid (AA) without post-modification.
• To evaluate the MOF as a biosensor for simultaneous detection of AA and L-tryptophan (L-Trp) in complex environments.

Main Methods:

• Synthesis of a water-stable copper metal-organic framework, {[Cu2(HL)2(μ2-OH)2(H2O)5]·H2O}n (1).
• Fabrication of a glass carbon electrode modified with the synthesized MOF.
• Electrochemical characterization and detection of AA and L-Trp using cyclic voltammetry and differential pulse voltammetry.

Main Results:

• The synthesized MOF (1) demonstrated excellent water stability.
• The MOF-modified electrode effectively detected ascorbic acid (AA) electrochemically without further modification.
• Simultaneous detection of AA and L-tryptophan (L-Trp) was achieved using the developed biosensor in both single-component solutions and bio-mimic environments.

Conclusions:

• A water-stable copper MOF can be utilized as an effective electrochemical biosensor.
• The MOF enables sensitive and simultaneous detection of ascorbic acid and L-tryptophan.
• This MOF-based biosensor shows promise for analyzing key biomolecules in biological samples.