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Khan, Mir Azam,Jin, Seung Oh,Lee, Sang Hak,Chung, Hye Young John Wiley Sons, Ltd. 2009 Luminescence Vol.24 No.2
<P>In this work a new spectrofluorimetric method for the determination of vitamin B<SUB>1</SUB>,<SUB> </SUB>based on the catalytic activity of horseradish peroxidase (HRP) in the presence of hydrogen peroxide (H<SUB>2</SUB>O<SUB>2</SUB>), has been developed. Non-fluorescent vitamin B<SUB>1</SUB> was easily converted through catalytic oxidation in alkaline medium into a fluorescent compound, even without exposure to light. The linear range for vitamin B<SUB>1</SUB> observed was 0.026–16.83 µg/mL (RSD = 1.75%). The correlation coefficient for the calibration curve and limit of detection were found to be 0.9964 and 0.015 µg/mL, respectively. The developed method is practical, simple, sensitive and relatively free from interference by coexisting substances and has been successfully applied for the determination of vitamin B<SUB>1</SUB> in pharmaceutical preparations. Copyright © 2008 John Wiley & Sons, Ltd.</P>