Phosphate Buffered Saline pH 7.4 - Physiological Applications
PBS pH 7.4 (standard physiological formulation) provides optimal isotonic buffering supporting mammalian cell culture, ELISA protocols, and protein biochemistry applications.Mammalian cell culture laboratories wash monolayers and harvest suspension cultures using PBS pH 7.4. Physiological osmolarity prevents blebbing while neutral pH maintains receptor-mediated endocytosis pathways.ELISA laboratories prepare sample dilutions and wash buffers using 1X PBS pH 7.4. Optimal ionic strength reduces non-specific binding while phosphate buffering maintains HRP/TAP enzyme conjugate stability.Western blot laboratories block membranes using 5% milk-PBS preventing high background. Physiological tonicity maintains protein transfer efficiency while calcium-compatible formulation supports serum blocking agents.Quality control confirms osmolarity (285-315 mOsm/kg), pH stability (7.3-7.5), and endotoxin absence (<0.03 EU/mL). Sterile filtration prevents microbial contamination compromising cell viability assays.10X liquid formulation enables rapid working buffer preparation. Protease/DNase-free production prevents sample degradation during supernatant processing and nucleic acid purification.Storage maintains stability through 2-8°C refrigeration preventing phosphate precipitation. Light protection prevents riboflavin degradation compromising fluorescent detection systems.Safety classification simplifies hazardous materials handling and shipping. Secondary pouches prevent cross-contamination between immunoassay platforms and cell culture incubators.ISO 13485 manufacturing verifies electrolyte concentrations, sterility assurance, and performance consistency. USP/EP compliance supports diagnostic laboratory accreditation requirements across global networks.
