Calcium Phosphate Transfection: Optimized 2X buffer (50 mM HEPES, 280 mM NaCl, 1.5 mM Na2HPO4; pH 7.05) for forming CaPO4–DNA precipitates in mammalian cells.

Cell Culture Washing and Handling: Maintains physiological ionic strength and near-neutral pH during cell rinses, dilutions, and media exchanges.

Biosensor Running Buffer (SPR/BLI): Used as a base HEPES-saline buffer for protein–ligand interaction studies; often supplemented with surfactant/EDTA as needed.

Immunoassays (ELISA/Western Blot): Wash and dilution buffer where a HEPES-based saline is preferred over phosphate- or Tris-based systems.

Flow Cytometry/Immunostaining: Staining and wash buffer (commonly with BSA/azide) to preserve cell integrity and fluorescence signals.

Protein Purification Workflows: Equilibration/wash buffer for affinity and other chromatographic steps when phosphate-sensitive conditions are required.

Enzyme Assays: Provides stable pH near neutrality for activity measurements and inhibitor screening.

Viral Packaging Workflows: Buffer for transfection-driven production and subsequent washing steps in lentiviral/retroviral systems.