Kinetically Enhanced Fabrication of Homogeneous Biomimetic and Functional Emulsion Droplets

Area of Science:

• Biophysics
• Materials Science
• Surface Chemistry

Background:

• Ligand-functionalized emulsion droplets serve as versatile probes in biophysical and biological studies.
• Current functionalization methods often result in heterogeneous surface densities on droplets.
• Achieving uniform surface functionalization is crucial for reliable probe performance.

Purpose of the Study:

• To develop a novel protocol for homogeneous surface decoration of emulsion droplets with lipids and proteins.
• To improve the control over surface density and distribution of functional molecules on emulsion droplets.
• To demonstrate the versatility and biocompatibility of the developed surface decoration method.

Main Methods:

• Utilized polar cosolvents to dissolve lipids in the aqueous phase post-emulsification for surface decoration.
• Investigated lipid and protein (streptavidin, immunoglobulins) surface density using titration isotherms.
• Assessed the impact of surfactants and varying cosolvent polarities on lipid insertion.
• Produced monodisperse functional magnetic emulsions to demonstrate method generality and homogeneity.

Main Results:

• Achieved narrow normal distribution of lipid surface density on droplets of the same size.
• Demonstrated successful homogeneous coating with biologically relevant proteins like immunoglobulins.
• Showcased the production of sophisticated, monodisperse functional magnetic emulsions with high surface homogeneity.
• Confirmed IgG-coated droplets' utility as probes in phagocytosis experiments.

Conclusions:

• The developed surface decoration protocol enables precise and homogeneous functionalization of emulsion droplets.
• This method offers improved control over probe characteristics for advanced research applications.
• The technique is versatile, biocompatible, and applicable to creating sophisticated functional materials.