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Time-Resolved Fluorescence

An Approach in Protein Analysis
  • A. Villari
  • N. Micali
  • M. Fresta
  • S. Trusso
  • G. Puglisi
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 398)

Abstract

This paper deal with the spectroscopic analysis of proteins, i.e., human serum albumin (HSA) and bovine serum albumin (BSA). These two proteins present very similar UV absorption and fluorescence spectra. The UV-spectra of both proteins result from the sum of the absorption spectra of the aromatic amino acid, mainly tryptophan and tyrosine, present in the biological molecules. On the contrary, the fluorescence HSA and BSA spectra are not the sum of the emission fluorescence spectra of tyrosine and tryptophan, but they are mainly constituted by the tryptophan fluorescence with a poor contribution arising from tyrosine. This fact may be due to inter- and intramolecular quenching phenomena. Significant difference were recorder in the life time fluorescence decay of HSA and BSA, which showed T values of 2.3 and 4.5 nanoseconds, respectively. The time-resolved fluorescence spectroscopy was performed with an experimental apparatus assembled in our laboratories, which is able of measuring the fluorescence decay in the range 2xl0-1010-2xl0-8 sec.

Keywords

Human Serum Albumin Aromatic Amino Acid Fluorescence Lifetime Fluorescence Decay Tryptophan Fluorescence 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1996

Authors and Affiliations

  • A. Villari
    • 1
  • N. Micali
    • 2
  • M. Fresta
    • 3
  • S. Trusso
    • 2
  • G. Puglisi
    • 3
  1. 1.Dipartimento Farmaco-Chimico, Facoltà di FarmaciaUniversità di MessinaMessinaItaly
  2. 2.Istituto di Tecniche Spettroscopiche CNR MessinaMessinaItaly
  3. 3.Istituto di Chimica Farmaceutica e TossicologicaUniversità di CataniaCataniaItaly

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