Sodium citrate dihydrate

Sodium citrate dihydrate (CAS No.: 6132-04-3) is a small molecule citrate salt and naturally occurring organic acid derivative that is broadly classified as a biochemical reagent for buffer engineering, metal ion chelation studies, and anticoagulation related experimental systems in life sciences research and early stage drug discovery workflows, with a functional background linked to its presence in citrus derived metabolic chemistry and its established role as a tricarboxylate species that modulates ionic microenvironments, calcium dependent processes, and pH stability in vitro; in mechanistic terms, its best supported research action is physicochemical sequestration of divalent cations, particularly calcium, thereby indirectly influencing calcium dependent coagulation enzyme cascades, cell adhesion behavior, and assay matrix performance rather than acting as a highly selective receptor ligand, and while literature reports also describe effects on tumor cell proliferation, apoptosis associated phenotypes, antimicrobial responses, and oxidative stress related readouts, these observations are generally interpreted as context dependent metabolic and ionic effects requiring model specific validation with no universally confirmed single molecular target or canonical signaling pathway assignment; correspondingly, quantitative potency metrics such as IC50, EC50, or MIC are not consistently standardized across platforms and are often reported across broad millimolar to high micromolar experimental windows depending on cell type, medium composition, and endpoint definition, so it is most appropriately positioned as a multifunctional research excipient and condition modulator in cell based assays, ex vivo blood handling protocols, bioanalytical method development, and formulation screening in which the concentrations or doses used in experiments typically depend on specific experimental designs and research objectives.