Simultaneous measurement of circular dichroism and fluorescence polarization anisotropy

Research output: Contribution to journalConference article

11 Scopus citations

Abstract

Circular dichroism and fluorescence polarization anisotropy are important tools for characterizing biomolecular systems. Both are used extensively in kinetic experiments involving stopped- or continuous flow systems as well as titrations and steady-state spectroscopy. This paper presents the theory for determining circular dichroism and fluorescence polarization anisotropy simultaneously, thus insuring the two parameters are recorded under exactly the same conditions and at exactly the same time in kinetic experiments. The approach to measuring circular dichroism is that used in almost all conventional dichrographs. Two arrangements for measuring fluorescence polarization anisotropy are described. One uses a single fluorescence detector and signal processing with a lock-in amplifier that is similar to the measurement of circular dichroism. The second approach uses classic "T" format detection optics, and thus can be used with conventional photon-counting detection electronics. Simple extensions permit the simultaneous measurement of the absorption and excitation intensity corrected fluorescence intensity.

Original languageEnglish (US)
Pages (from-to)126-136
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4625
DOIs
StatePublished - Jan 1 2002
Externally publishedYes
EventClinical Diagnostic Systems: Technologies and Instrumentation - San Jose, CA, United States
Duration: Jan 22 2002Jan 24 2002

Keywords

  • Circular dichroism
  • Fluorescence polarization anisotropy
  • Photoelastic modulator
  • Stopped flow kinetics
  • Ultraviolet absorption spectra

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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