Re-electrospraying splash-landed proteins and nanoparticles.

Area of Science:

• Analytical Chemistry
• Materials Science
• Biophysics

Background:

• Accurate characterization of nanoparticles and biomolecules is crucial for various scientific applications.
• Existing methods for size selection and purification can be limited in homogeneity and efficiency.

Purpose of the Study:

• To develop and validate a novel electrospray-based method for size-selected purification and homogenization of particles and biomolecules.
• To assess the effectiveness of differential electrical mobility coupled with condensation growth for creating highly homogeneous samples.

Main Methods:

• Electrospraying of FITC-albumin, Lsr-F, and fluorescent latex particles from aqueous buffer.
• Size selection using differential electrical mobility at atmospheric pressure.
• Condensation growth to form single-ion/particle-laden water droplets.
• Impact landing onto temperature-controlled surfaces and sample recovery.
• Re-electrospraying and secondary differential electrical mobility analysis.
• Transmission electron microscopy (TEM) for sample validation.

Main Results:

• A narrow size cut of singly charged ions or particles was achieved via differential electrical mobility.
• Condensation growth successfully created single-particle/ion droplets.
• Re-analysis by differential electrical mobility showed significantly increased sample homogeneity.
• TEM analysis confirmed the homogeneity of size-selected Lsr-F samples.

Conclusions:

• The combined electrospray, differential electrical mobility, and condensation growth technique offers an effective approach for purifying and homogenizing nanoparticles and biomolecules.
• This method improves sample homogeneity, which is critical for precise scientific investigation and characterization.
• The validated technique holds promise for applications requiring highly uniform particle and biomolecule samples.