Functionalization of paramagnetic nanoparticles for protein immobilization and purification

Area of Science:

• Biomaterials Science
• Nanotechnology
• Biochemistry

Background:

• Protein purification is crucial for biochemical research and industrial applications.
• Existing methods can be time-consuming and may lead to protein denaturation.
• Development of efficient and reusable protein immobilization matrices is needed.

Purpose of the Study:

• To synthesize and characterize a novel paramagnetic nanocomposite for protein immobilization.
• To evaluate its efficacy as a metal affinity matrix for purifying recombinant proteins.
• To assess the stability and reusability of the immobilized enzyme.

Main Methods:

• Synthesis of Fe3O4 nanoparticles and coating with chitosan.
• Derivatization of nanoparticles with N-(5-Amino-1-carboxy-pentyl) iminodiacetic acid (NTA).
• Characterization using Transmission Electron Microscopy and Fourier Transform Infrared Spectroscopy.
• Metal affinity chromatography for protein purification and enzyme activity assays.

Main Results:

• Fe3O4 nanoparticles (10-50 nm) were successfully coated and functionalized with NTA.
• The nanocomposite demonstrated high purity (>95%) in separating polyhistidine-tagged β-galactosidase from E. coli lysates.
• Binding capacity reached 250 μg/mg, with 80% enzyme activity retained after 9 cycles.
• Immobilized enzyme retained catalytic activity over multiple reaction cycles.

Conclusions:

• The developed NTA-functionalized paramagnetic nanocomposite is an effective matrix for protein purification and enzyme immobilization.
• The material offers high binding capacity, good stability, and reusability.
• This technology has potential applications in biotechnology, diagnostics, and biocatalysis.