alexa Colorimetric detection of loop-mediated isothermal amplification reaction by using hydroxy naphthol blue.
Microbiology

Microbiology

Journal of Antivirals & Antiretrovirals

Author(s): Goto M, Honda E, Ogura A, Nomoto A, Hanaki K

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Abstract Loop-mediated isothermal amplification (LAMP), a novel gene amplification method, enables the synthesis of larger amounts of both DNA and a visible byproduct--namely, magnesium pyrophosphate--without thermal cycling. A positive reaction is indicated by the turbidity of the reaction solution or the color change after adding an intercalating dye to the reaction solution, but the use of such dyes has certain limitations. Hydroxy naphthol blue (HNB), a metal indicator for calcium and a colorimetric reagent for alkaline earth metal ions, was used for a new colorimetric assay of the LAMP reaction. Preaddition of 120 microM HNB to the LAMP reaction solution did not inhibit amplification efficiency. A positive reaction is indicated by a color change from violet to sky blue. The LAMP reaction with HNB could also be carried out in a 96-well microplate, and the reaction could be measured at 650 nm with a microplate reader. The colorimetric LAMP method using HNB would be helpful for high-throughput DNA and RNA detection. This article was published in Biotechniques and referenced in Journal of Antivirals & Antiretrovirals

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