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Proceedings Paper

Time-resolved DNA identification in capillary gel electrophoresis with semiconductor lasers
Author(s): Ralph Mueller; Dirk Herten; Ulrike Lieberwirth; Michael Neumann; Markus Sauer; Andreas Schulz; Stefan Siebert; Karl-Heinz Drexhage; Juergen M. Wolfrum
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Paper Abstract

We developed a simple, tiny setup with only a few optical devices for fast and sensitive identification of DNA with a short-pulse semiconductor laser operating at 20 MHz. In combination with newly synthesized fluorescent dyes (rhodamine derivatives) which exhibit high fluorescence quantum efficiencies and distinct fluorescence lifetimes at semiconductor laser excitation wavelength a sensitive detection and time-resolved identification of DNA can be achieved. At an excitation wavelength of 635 nm the fluorescence background is greatly reduced. We demonstrate the DNA identification of A- and G-terminated DNA fragments labeled at the 5'-end with the rhodamine derivatives MR 200- 1 and JA 169 during capillary gel electrophoresis. The characteristic time-resolved data are acquired by the time- correlated single-photon counting technique. Time-resolved identification analysis is realized by the maximum likelihood estimator. For prediction of the error rate (misclassification) Cramers equation in combination with a pattern recognition technique is applied. These methods deliver high reliabilities at low classification error rates for low fluorescence light level applications.

Paper Details

Date Published: 7 May 1997
PDF: 11 pages
Proc. SPIE 2980, Advances in Fluorescence Sensing Technology III, (7 May 1997); doi: 10.1117/12.273569
Show Author Affiliations
Ralph Mueller, Univ. Heidelberg (Germany)
Dirk Herten, Univ. Heidelberg (Germany)
Ulrike Lieberwirth, Univ. Heidelberg (Germany)
Michael Neumann, Univ. Heidelberg (Germany)
Markus Sauer, Univ. Heidelberg (Germany)
Andreas Schulz, Univ. Heidelberg (Germany)
Stefan Siebert, Univ. Heidelberg (Germany)
Karl-Heinz Drexhage, Univ.-Gesamthochschule Siegen (Germany)
Juergen M. Wolfrum, Ruprecht-Karls-Univ. Heidelberg (Germany)

Published in SPIE Proceedings Vol. 2980:
Advances in Fluorescence Sensing Technology III
Richard B. Thompson, Editor(s)

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