E. coli K-12 asparaginase-based asparagine biosensor for leukemia.

Area of Science:

• Biomedical Engineering
• Analytical Chemistry
• Oncology

Background:

• Asparagine levels are altered in leukemia.
• Accurate monitoring of asparagine is crucial for leukemia diagnosis and treatment.
• Existing diagnostic methods may lack sensitivity or speed.

Purpose of the Study:

• To develop a novel, diagnostic biosensor for monitoring asparagine levels in leukemia.
• To optimize immobilization strategies for enhanced biosensor stability and performance.
• To evaluate the biosensor's detection capabilities in clinical serum samples.

Main Methods:

• Immobilization of asparaginase (the biocomponent) using various strategies (nitrocellulose membrane, silicon gel, calcium alginate beads).
• Co-immobilization of Phenol Red indicator with asparaginase.
• Optimization of a colorimetric visualization approach for asparagine detection.
• Determination of detection limits for different immobilization materials.
• Application of the calcium alginate bead system for asparagine detection in normal and leukemia serum samples.

Main Results:

• Different immobilization methods were tested, with calcium alginate beads showing promising results.
• The detection limits for asparagine varied across immobilization materials, with calcium alginate beads achieving 10(-9)-10(-1) M.
• A colorimetric approach was optimized for visual asparagine range determination.
• The calcium alginate bead system successfully detected asparagine levels in both normal and leukemia serum samples.

Conclusions:

• A novel, stable, and sensitive biosensor for asparagine detection has been developed.
• The calcium alginate bead immobilization strategy is effective for creating a diagnostic tool for leukemia.
• This biosensor shows potential for clinical application in monitoring asparagine levels in leukemia patients.