PMA qPCR live bacteria detection kit – E. coli (uidA)

PMA qPCR live bacteria detection kit provides an effective method for detecting bacterial viability. The kit includes PMA dye and a SYBR Green-based qPCR mix. PMA is a high-affinity DNA-binding dye that primarily binds to double-stranded DNA and emits bright fluorescence upon binding. Since PMA cannot penetrate cell membranes, it only modifies the DNA of dead cells with damaged membranes. After exposure to blue light (~464 nm), the photosensitive azide groups on PMA are converted into highly reactive nitrene radicals, forming stable covalent nitrogen-carbon bonds, which result in permanent modification of the DNA, making it insoluble and lost during subsequent genomic DNA extraction. Unbound PMA decomposes into non-crosslinking hydroxylamine compounds under strong light and no longer binds to DNA. Thus, leveraging PMA's properties, the PMA-qPCR method combines PMA with qPCR technology for a novel detection approach, used for live bacterial screening. This method has been validated in various bacteria, yeasts, fungi, viruses, and parasites.