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Magnetic Levitation Patterns of Microfluidic-Generated Nanoparticle-Protein Complexes.

Luca Digiacomo1, Erica Quagliarini1, Benedetta Marmiroli2

  • 1NanoDelivery Lab, Department of Molecular Medicine, Sapienza University of Rome, Viale Regina Elena 291, 00161 Rome, Italy.

Nanomaterials (Basel, Switzerland)
|July 27, 2022
PubMed
Summary

Optimizing microfluidic magnetic levitation (MagLev) with specific flow rates and ratios enhances nanoparticle-protein corona analysis for diagnostics. This allows bulk mixing for initial steps and microfluidic mixing for validation, improving diagnostic technology development.

Keywords:
graphene oxidemagnetic levitationmicrofluidicsprotein corona

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Diagnostic Technology Development

Background:

  • Magnetic levitation (MagLev) is a promising diagnostic technology leveraging nanoparticle (NP)-protein corona interactions.
  • Experimental optimization of MagLev for robustness, reproducibility, and accuracy remains underexplored.
  • Understanding flow dynamics is crucial for refining MagLev-based diagnostic assays.

Purpose of the Study:

  • To investigate the impact of total flow rate (TFR) and flow rate ratio (FRR) on MagLev patterns of graphene oxide (GO)-protein complexes.
  • To establish efficient protocols for MagLev experiments, differentiating between optimization and validation phases.
  • To enhance the reliability and applicability of MagLev for nanoparticle-based diagnostics.

Main Methods:

  • Microfluidic generation of graphene oxide (GO) and human plasma (HP) complexes.
  • Comparison of microfluidic mixing with bulk mixing for MagLev analysis.
  • Characterization of levitating and precipitating fractions using AFM, BCA, 1D SDS-PAGE, and nano-LC-MS/MS.

Main Results:

  • Specific TFR and FRR combinations (e.g., TFR=35 μL/min, FRR=9:1 or TFR=3.5 μL/min, FRR=19:1) yield MagLev patterns with bulk-like features.
  • These optimized flow conditions produce MagLev patterns dominated by levitating and precipitating fractions.
  • Microfluidic mixing can achieve bulk-like results, validating the use of bulk mixing for initial optimization and exploration.

Conclusions:

  • Bulk mixing is suitable for optimization and exploration steps in MagLev diagnostic development.
  • Microfluidic mixing ensures high reproducibility for the validation step, conserving limited human specimens.
  • This study provides a framework for developing robust and reproducible MagLev diagnostic technologies using coronated nanomaterials.