Adsorption and desorption studies of lysozyme by Fe3O4–polymer nanocomposite via fluorescence spectroscopy

• Fe3O4 nanoparticles were synthesized by in situ in polyacrylamide hydrogels.
• Fe3O4–polymer composites show super-paramagnetic features.
• Higher monomer concentration composites present lower saturation magnetization.
• Adsorption/desorption kinetics of lysozyme were investigated via PL spectroscopy.
• Compact structures caused increasing adsorption and desorption rates of lysozyme.

The work have been undertaken in this study is to synthesis and characterize Fe3O4–polymer nanocomposites which are having different morphological properties. Also, investigation of the adsorption and desorption behaviour of lysozyme onto Fe3O4–polymer nanocomposites have been studied. Fe3O4 nanoparticles, synthesized by in situ in polyacrylamide hydrogels, show super-paramagnetic behaviour and saturation magnetization of composite material have been tuned by changing the hydrogel conformation. Adsorption and desorption studies of lysozyme were followed by using pure water at room temperature via fluorescence measurements. Fluorescence measurements showed that, the composite materials adsorbed lysozyme molecules less than 20 s and higher monomer concentration of composite materials cause faster adsorption. Besides, structure of lysozyme molecules were not changed during the adsorption and desorption. As a result Fe3O4–polymer nanocomposites could be used for drug delivery, protein separation and PAAm gels could be used for synthesis of magnetic composites with varying magnetic properties.

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