were 1× isothermal amplification buffer, 1.4m mol·L
−1 deoxyribonucleoside triphosphates (dNTPs), and 10
mmol·L−1 MgSO4 from New England
Biolabs, and 0.4 mol ·L −1 betaine from
Sigma-Aldrich. In some cases, where indicated, 0.8
mol·L−1 betaine was used. These reaction
buffer components were prepared in appropriate ratios in bulk and stored at
−20 °C between experiments. Enzymes and DNA intercalating
dye were added separately to this buffer mix for a complete master mix that
was freshly prepared for each experiment. The RT-LAMP enzymes used in the
reaction were 0.64 U· µL
−1Bst 2.0 DNA polymerase and 0.08
U· µL−1 AMV reverse transcriptase fro m
New Engl and Biolabs. 1× EvaGreen from Biotium, a double-stranded
DNA (dsDNA) intercalating dye, was included in the reaction for the
detection of reaction products.