Plant Preservative Mixture (PPM) is a broad-spectrum biocide for plant tissue culture. PPM™ is the ultimate solution for the endless fight against airborne, waterborne and endogenous microbial contamination. PPM™ is a heat-stable biocide/preservative that can be used to effectively prevent or reduce microbial contamination in plant tissue culture. At optimal dosages, PPM™, which stands for Plant Preservative Mixture™, is an extremely effective preservative/biocide but does not affect in vitro seed germination, callus proliferation, or callus regeneration.
PPM™ prevents the germination of bacterial and fungal spores. It is heat stable and can therefore be autoclaved with the media. PPM™ can and should be used as a standard ingredient in plant tissue culture media, and is also substantially less expensive than commonly used antibiotics. While PPM™ is primarily designed to inhibit air pollution, water pollution, and contamination introduced by human contact, it can also, in many cases, be used to reduce endogenous contamination. Despite the stricter use of sterile techniques, contamination of plant cell and tissue cultures remains a persistent problem that can result in losses ranging from a small number of cultures to the loss of entire batches.