Dynamic Monitoring of Biomolecular Hydrodynamic Dimensions by Magnetization Motion on Quartz Crystal Microbalance

Area of Science:

• Biophysics
• Materials Science
• Nanotechnology

Background:

• Hydrodynamic dimension (HD) is critical for bioconjugated particles and biomolecules, essential for understanding solid-liquid dynamics.
• Dynamic monitoring of HD is vital for personalized medicine, enabling study of biomolecule changes in response to stimuli.
• Existing methods like dynamic light scattering (DLS) struggle with polydisperse samples for dynamic monitoring.

Purpose of the Study:

• To introduce a novel method for hydrodynamic dimension (HD) dynamic monitoring of biomolecule-magnetic bead particles (bioMBs).
• To enable precise, real-time tracking of biomolecular size changes in response to external stimuli.
• To validate the method's capability for controlled drug release applications in precision medicine.

Main Methods:

• Developed the Magnetic modulated quartz crystal microbalance (MMQCM) method for HD dynamic monitoring.
• Utilized an alternating magnetic field to excite bioMBs, generating magnetization motion.
• Analyzed the quartz crystal microbalance (QCM) output signal's frequency spectrum to extract particle size information.

Main Results:

• Successfully evaluated the size of bioMBs with varying biomolecule concentrations using the MMQCM approach.
• Achieved 30-minute HD dynamic monitoring, observing a ~10 nm size increase during biomolecular stretching.
• Documented a subsequent 20-40 nm size reduction due to biomolecule dissociation, controllable by magnetic stimulation duration.

Conclusions:

• The MMQCM method provides effective HD dynamic monitoring for polydisperse samples.
• Demonstrated real-time observation of biomolecular structural changes and release dynamics.
• The findings offer valuable guidance for developing controlled drug release systems in personalized precision medicine.