Cell Culture and Tissue Handling: Isotonic, pH 7.0 buffer for washing, dilution, and resuspension of mammalian cells; endotoxin tested and sterile for sensitive applications.

Calcium Phosphate Transfection (HBS): Used as HEPES-buffered saline in DNA–calcium phosphate transfection protocols.

Surface Plasmon Resonance (SPR/Biacore): Serves as a running and sample buffer to maintain stable ionic strength and pH.

ELISA and Immunoassays: Employed as a sample/wash buffer to reduce nonspecific binding and preserve antigen–antibody interactions.

Protein Purification: Used in affinity purification and size-exclusion chromatography for equilibrating, washing, and eluting proteins under physiological conditions.

Buffer Exchange and Dialysis: Provides a defined endpoint buffer for desalting, diafiltration, and dialysis workflows.

Enzyme Assays and Protein Stability: Maintains neutral pH and physiological salt for activity measurements and storage.

Flow Cytometry: Used as a staining and resuspension buffer to preserve cell integrity and fluorescence signals.

Microscopy and Live-Cell Imaging: Supports imaging of live cells by maintaining osmolarity and pH during acquisition.

Lysate Preparation and Clarification: Diluent for protein lysates, including from Escherichia coli, to standardize ionic strength prior to downstream analysis.