Abstract
A fluorescence quenching method was developed for the rapid determination of DNA and RNA using magdala red as fluorescence probe. In weakly acidic ¶medium, the fluorescence of magdala red (λex>lem = 54055 nm) can be largely quenched by DNA or RNA. The calibration graphs are linear over the range 0.01–¶1.2 μg/mL for both calf thymus DNA (CT DNA) and salmon DNA (SM DNA), and 0.015–1.0 μg/mL for yeast RNA, respectively. The corresponding detection limits are ¶6.0 ng/mL for CT DNA, 7.0 ng/mL for SM DNA and ¶15.0 ng/mL for yeast RNA, respectively. CT DNA could be determined in the presence of 20% (w/w) yeast RNA, and the relative standard deviation of six replicate measurements is 3.18% for 400 ng/mL of CT DNA. Interference from coexisting substances in the determination of DNA was also examined. Real samples were determined with satisfactory results.
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Received: 9 June 1999 / Revised: 23 August 1999 / Accepted: 25 August 1999
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Yang, HH., Zhu, QZ., Chen, QY. et al. Application of magdala red as a fluorescence probe in the determination of nucleic acids. Fresenius J Anal Chem 366, 303–306 (2000). https://doi.org/10.1007/s002160050057
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DOI: https://doi.org/10.1007/s002160050057