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The aggregation behaviour of protein-coated particles: a light scattering study
María Tirado-Miranda1, Artur Schmitt, José Callejas-Fernández
1Department of Physics, University of Extremadura, 10071 Cáceres, Spain.
European Biophysics Journal : EBJ
|May 8, 2003
Summary
Bridging flocculation drives aggregation in bovine serum albumin (BSA)-coated latex particles at low to intermediate surface coverage. At high coverage, weak flocculation dominates only at the isoelectric point.
Area of Science:
- Colloid and Surface Science
- Biophysical Chemistry
- Materials Science
Background:
- Protein-particle interactions are crucial in various applications, including drug delivery and diagnostics.
- Understanding aggregation mechanisms is key to controlling particle behavior in suspensions.
Purpose of the Study:
- To investigate the aggregation mechanisms of latex particles coated with bovine serum albumin (BSA).
- To determine the influence of surface coverage and pH on flocculation processes.
Main Methods:
- Static and dynamic light scattering were employed to analyze aggregate fractal dimension and hydrodynamic radius.
- Controlled preparation of particles with varying BSA surface coverage.
- Manipulation of particle surface charge by adjusting the pH of the aqueous phase.
Main Results:
- Bridging flocculation was identified as the primary mechanism at low and intermediate BSA surface coverage, regardless of particle charge.
- At high BSA surface coverage, weak flocculation became significant only when BSA molecules were at their isoelectric point.
Conclusions:
- The degree of protein surface coverage dictates the dominant aggregation mechanism in BSA-coated latex particles.
- pH-dependent charge effects play a role in aggregation, particularly at high surface coverage, influencing the transition to weak flocculation.