New derivative of carnosine for nanoparticle assemblies

Area of Science:

• Biochemistry
• Nanotechnology
• Medicinal Chemistry

Background:

• Carnosine (β-alanyl-l-histidine) is a naturally occurring dipeptide with antioxidant, antiglycating, and buffering properties.
• Its therapeutic potential is limited by rapid hydrolysis in human plasma by carnosinase.
• Chemical modification offers a strategy to improve carnosine's bioavailability and enable targeted delivery.

Purpose of the Study:

• To synthesize and characterize a novel carnosine derivative conjugated with biotin.
• To evaluate the stability of the carnosine-biotin conjugate against serum carnosinase.
• To assess the copper(II) binding capacity and avidin/streptavidin binding affinity of the conjugate for nanoparticle functionalization.

Main Methods:

• Synthesis of a carnosine-biotin conjugate.
• Structural characterization using Nuclear Magnetic Resonance (NMR) and Mass Spectrometry (MS).
• Assessment of hydrolytic stability against serum carnosinase.
• Evaluation of copper(II) binding ability.
• Spectrophotometric assay to determine binding affinity to avidin and streptavidin.
• Functionalization of gold nanoparticles with the carnosine-biotin conjugate.

Main Results:

• A novel carnosine-biotin conjugate was successfully synthesized and characterized.
• The conjugate demonstrated enhanced stability against serum carnosinase compared to native carnosine.
• The carnosine-biotin conjugate retained copper(II) binding ability.
• High binding affinity to avidin and streptavidin was confirmed, enabling nanoparticle functionalization.

Conclusions:

• The synthesized carnosine-biotin conjugate offers improved stability and retains key functional properties of carnosine.
• The avidin-biotin technology can be effectively utilized to deliver the carnosine derivative via functionalized nanoparticles.
• This approach holds promise for targeted delivery of carnosine for therapeutic applications.