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Updated: May 31, 2026

Characterizing Individual Protein Aggregates by Infrared Nanospectroscopy and Atomic Force Microscopy

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Microstructure of polyelectrolyte nanoaggregates studied by fluorescence probe method.

Marilena Vasilescu¹, Daniel G Angelescu, Rodica Bandula

¹Institute of Physical Chemistry, I.G. Murgulescu Romanian Academy, Bucharest, Romania. vasilescu.marilena@gmail.com

Journal of Fluorescence

|June 21, 2011

Summary

Researchers studied nanoaggregates using fluorescence probes to understand their microstructure. They found that microviscosity increases with the grafting density of polyacrylamide chains in the polyelectrolyte complex.

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Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

Published on: July 19, 2016

Area of Science:

Polymer Science
Supramolecular Chemistry
Materials Science

Background:

Polyelectrolyte complexes (PECs) are formed by the interaction of oppositely charged polymers.
Understanding the microstructure of PECs is crucial for designing advanced materials.
Water-soluble nanoaggregates offer unique properties for various applications.

Purpose of the Study:

To investigate the microstructure of water-soluble nanoaggregates formed by a cationic comb-type copolymer and an anionic linear polyelectrolyte.
To analyze the effects of polymer composition and grafting density on the nanoaggregate properties.
To correlate fluorescence probe responses with the microenvironment of the polyelectrolyte complex.

Main Methods:

Utilized fluorescence probe techniques with 1-anilinonaphthalene-8-sulfonic acid (ANS), pyrene (Py), and 1,10-bis(1-pyrene) decane (PD).
Quantified micropolarity using the Reichardt polarity index E(T)(30).
Assessed microviscosity via the excimer-to-monomer fluorescence intensity ratio of the PD probe.

Main Results:

Micropolarity varied with the charge ratio of the polymers, reaching minimum values at charge neutralization.
Microviscosity was influenced by the composition and grafting density of the comb-type copolymer.
Increased grafting density of polyacrylamide chains led to higher microviscosity within the nanoaggregates.

Conclusions:

The study reveals a direct relationship between polyacrylamide grafting density and the microviscosity of polyelectrolyte complex nanoaggregates.
Fluorescence probes are effective tools for characterizing the complex microenvironments within water-soluble polymer systems.
Findings provide insights into the structure-property relationships of polyelectrolyte complex nanoaggregates.