Ray, Thioflavin T absorbs maximally at 412 nm and has a broad absorption band (approx. 350 - 450 nm). This is shown on page 701 of the Sigma-Aldrich handbook of Dyes, Stains and Indicators. I can FAX you a copy if you don't have access to this volume. There are two references cited for use of this dye as a fluorescent stain for biological samples (viruses and insects). I hope this helps, Michael Kuhn, President Helix Research Co. Fluorescence Chemistry mkuhn@helixresearch.com www.helixresearch.com
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