Polyvinyl Alcohol Pva Podwer 1788 2488 2688

Polyvinyl Alcohol (PVA) is a vinyl polymer joined by only carbon–carbon linkages. The linkage is the same as those of typical plastics such as polyethylene, polypropylene, and polystyrene, and of water-soluble polymers such as polyacrylamide and polyacrylic acid. Among the vinyl polymers produced industrially, PVA is the only one known to be mineralized by microorganisms. PVA is water soluble and biodegradable; hence it is used to make water-soluble and biodegradable carriers, which may be useful in the manufacture of delivery systems for chemicals such as fertilizers, pesticides, and herbicides.

PVA is completely degraded and utilized by a bacterial strain, Pseudomonas O-3, as a sole source of carbon and energy. However, PVA-degrading microorganisms are not ubiquitous within the environment. Almost all the degrading strains belong to the genus Pseudomonas, although some do belong to other genera (Chielliniet et al., 2003). Among the PVA-degrading bacteria reported so far, a few strains showed no requirement for pyrroloquinoline quinone (PQQ). From a PVA-utilizing mixed culture, Pseudomonas sp. VM15C and P. putida VM15A were isolated. Their symbiosis is based on a syntrophic interaction. VM15C is a PVA-degrading strain that degrades and metabolizes PVA, while VM15A excretes a growth factor that VM15C requires for PVA utilization.