Used for detecting and quantifying polyphosphate kinase (PPX) enzyme activity in microbial samples through an enzyme-linked immunosorbent assay (ELISA) format. This kit enables researchers to assess microbial polyphosphate metabolism, which plays a key role in cellular energy storage, stress response, and phosphate regulation in bacteria and other microorganisms. It is commonly applied in environmental microbiology to study wastewater treatment processes, where polyphosphate-accumulating organisms are involved in biological phosphorus removal. Also used in research on bacterial persistence, biofilm formation, and pathogenesis, as PPX activity is linked to virulence and survival under nutrient-limited conditions. The assay provides a sensitive and specific method for high-throughput screening of PPX activity in lab cultures or environmental isolates.