The origin of ultraslow component of solvation observed in an aqueous protein solution is studied by femtosecond up-conversion. It has been observed that solvation dynamics in hen egg lysozyme and lysozyme- cetyltrimethylammonium bromide (CTAB) aggregate exhibits a nearly twofold slowing down when the solvent H 2O is replaced by D 2O. The deuterium isotope effect suggests that water is the main polar species responsible for the observed ultrafast solvation dynamics in the aqueous protein solution.

Dibyendu Kumar Sasmal

Department of Chemistry

IIT Jodhpur

A.K. Das

K. Bhattacharyya

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Journal	Current Science
ISSN	00113891