Journal: Scientific Reports
Article Title: Two-phase wash to solve the ubiquitous contaminant-carryover problem in commercial nucleic-acid extraction kits
Figure Lengend Snippet: Evaluation of TPW for different silica-column NA extraction kit protocols on pure water samples using ( a – c ) qPCR and ( d – f ) LAMP. All reactions were spiked with 5 × 10 4 copies λ phage DNA and primers. By manufacturer protocol, the ( a , d ) Zymo Quick-DNA/RNA Viral Kit and ( b , e ) Zymo ZR Viral DNA/RNA Kit do not include the dry spin (+dry spin) whereas the ( c , f ) Qiagen QIAquick PCR Purification Kit does. The left of each graph shows high dilution and the right shows low dilution. Each bar represents the result from a single qPCR or LAMP measurement. We ran 27 silica-column extractions (3 silica columns × 3 conditions × 3 extraction protocols) and the kit extract was shared between high and low dilutions of both qPCR and LAMP. Dashed lines show the C q or TTP for a reaction without inhibitors (“No Extract”). Samples marked N.D. were not detected within either 40 cycles or 40 min. ( a – f ) We asked whether the manufacturer protocol replicates (“No Dry Spin for Zymo kits, “+dry spin” for Qiagen kit) fell within the 95% CI of the corresponding +1-undecanol condition for the low kit extract dilution case. The number of replicates that lie outside the 95% CI are indicated by the number of + (above) and - (below).
Article Snippet: Kit extractions We tested three different silica-column kits: Zymo ZR Viral DNA/RNA Kit (outdated protocol, D7021), Zymo Quick-DNA/RNA Kit (updated protocol, D7021), and the QIAquick PCR Purification Kit (28104, Qiagen).
Techniques: Real-time Polymerase Chain Reaction, Polymerase Chain Reaction, Purification