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Photochemically induced nucleation in supersaturated and undersaturated thaumatin solutions

Paper ID Volume ID Publish Year Pages File Format Full-Text
28148 44061 2007 6 PDF Available
Title
Photochemically induced nucleation in supersaturated and undersaturated thaumatin solutions
Abstract

We demonstrate photochemically induced nucleation in supersaturated and undersaturated solutions of thaumatin. The irradiation of supersaturated and undersaturated thaumatin solutions in 0.75 M potassium sodium tartrate (PST) at pH 5.6 in N-(2-acetamido)iminodiacetic acid (ADA) buffer with β = 2 or β = 0.5 increased the number of thaumatin crystals in the droplet. The photochemical reaction induced the formation of unstable small clusters, which led to the growth of nuclei. The mechanism of nucleation enhancement was investigated in steady state and transient absorption experiments. The photochemical intermediate, in which one tryptophan residue is changed to a neutral tryptophanyl radical, appears to be responsible for the nucleation of thaumatin, as well as for the photochemically induced nucleation of lysozyme.

Keywords
Protein; Thaumatin; Nucleation; Photochemically induced nucleation
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Photochemically induced nucleation in supersaturated and undersaturated thaumatin solutions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 190, Issue 1, 5 July 2007, Pages 88–93
Authors
, , , , , , , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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