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Proceedings Paper

Photothermal denaturation of egg white by pulsed holmium laser
Author(s): Thomas Asshauer; Guy P. Delacretaz; Sohi Rastegar
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Paper Abstract

Heat denaturation of egg white is usually followed by polymerization or gelatin of the denatured components, primarily albumin, and is associated with manifestation of a distinct increase in scattering or whitening of the egg white. In this study the effect pulsed laser coagulation of egg white was studied using a CTH:YAG laser delivered through a 600 micrometers diameter fiber into a cuvette filled with raw egg white. The dynamics of laser induced photothermal denaturation of egg white was observed by monitoring the increase of light scattering by time resolved video imaging. Two distinct laser induced processes were observed. At higher radiant exposure (> 30 - 40 J/cm2) the egg whites was rapidly heated above the water vapor transition temperature and a cavitation bubble was formed. Below threshold for bubble formation a bullet-like zone of whitened egg-white is formed at the top of the fiber.

Paper Details

Date Published: 7 May 1996
PDF: 5 pages
Proc. SPIE 2681, Laser-Tissue Interaction VII, (7 May 1996); doi: 10.1117/12.239563
Show Author Affiliations
Thomas Asshauer, Ecole Polytechnique Federale de Lausanne (Switzerland)
Guy P. Delacretaz, Ecole Polytechnique Federale de Lausanne (Switzerland)
Sohi Rastegar, Ecole Polytechnique Federale de Lausanne (Switzerland) and Texas A&M Univ. (United States)


Published in SPIE Proceedings Vol. 2681:
Laser-Tissue Interaction VII
Steven L. Jacques, Editor(s)

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