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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

Tris buffer modulates polydopamine growth, aggregation, and paramagnetic properties.

Nicola Fyodor Della Vecchia¹, Alessandra Luchini, Alessandra Napolitano

¹Dipartimento di Scienze Chimiche, Università degli Studi di Napoli "Federico II" , Via Cintia, 80126 Napoli, Italy.

Langmuir : the ACS Journal of Surfaces and Colloids

|July 29, 2014

Summary

This summary is machine-generated.

Tris buffer controls polydopamine (melanin) particle growth and properties. This research reveals Tris buffer

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Comprehensive Profiling of Dopamine Regulation in Substantia Nigra and Ventral Tegmental Area

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Published on: August 10, 2012

Area of Science:

Materials Science
Biomaterials
Polymer Chemistry

Background:

Polydopamine (melanin) coatings are technologically relevant.
Factors influencing polydopamine properties are poorly understood.

Purpose of the Study:

Characterize polydopamine growth, morphology, and electronic properties.
Investigate the effect of dopamine concentration and buffer type (pH 8.5).

Main Methods:

Dynamic Light Scattering (DLS) for particle size.
Small Angle Neutron Scattering (SANS) for structure.
Electron Paramagnetic Resonance (EPR) for paramagnetic properties.

Main Results:

Increasing dopamine concentration increased particle size (Rh), especially in phosphate buffer.
Tris buffer significantly inhibited particle growth (<100 nm).
SANS indicated 2D structures in phosphate/bicarbonate and 3D fractal objects in Tris buffer.
EPR showed more homogeneous paramagnetic centers in Tris buffer.

Conclusions:

Tris buffer is an effective modulator of polydopamine formation.
Tris buffer allows rational control over melanin aggregate size, morphology, and free radical behavior.