Preparation of Phosphate-Buffered Saline (PBS): Component for making PBS and other phosphate buffers at defined pH for biological and biochemical workflows.

pH Adjustment and Titration: Used to adjust and stabilize solution pH in the physiological range for assays and reagent prep.

Enzyme Assays: Provides a stable phosphate buffer system for enzymes that require phosphate at acidic to neutral pH.

Protein Purification: Employed as equilibration, wash, and elution buffer in ion-exchange and affinity workflows requiring phosphate buffering.

Nucleic Acid Workflows: Included in wash and resuspension buffers for DNA/RNA extraction and clean-up procedures.

Immunoassays (ELISA/Western Blot): Basis for PBS and PBST wash and blocking buffers to maintain antigen–antibody interactions.

Cell and Tissue Handling: Used to formulate isotonic phosphate buffers for cell rinsing, dissociation, and sample preparation.

Microbial Culture Media: Buffers and supplies phosphate in defined media (e.g., M9) for growth of Escherichia coli and Bacillus subtilis.

Dialysis and Desalting: Serves as a stable external buffer for removing salts or exchanging buffers while maintaining protein integrity.

Chromatography and HPLC: Utilized as a reproducible inorganic buffer in preparative workflows and as a mobile phase component where compatible.

Histology and IHC: Provides consistent PBS-based washes for tissue section staining and antibody labeling.

General Sample Storage: Short-term storage of proteins and biomolecules at controlled pH when phosphate is compatible with the target.