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Phenol Red Sodium Salt; sodium 4-(3-(4-hydroxyphenyl)-1,1-dioxido-3H-benzo[c][1,2]oxathiol-3-yl)phenolate; CAS No.: 34487-61-1;Phenol Red Sodium Salt. PROPERTIES: Phenol Red Sodium Salt is a pink crystalline powder with a molecular formula of C19H14NaO5S and a molecular weight of 370.38 g/mol. It is freely soluble in water, forming reddish solutions. Storage should be at room temperature in a sealed container. Safety precautions include avoiding skin contact and eye exposure due to potential irritation. APPLICATIONS: Phenol Red is a pH indicator widely used in cell culture and biochemical assays. In cell biology research, it serves as a colorimetric pH indicator in culture media, changing color between yellow (pH <6.8) and pink (pH >8.4) (source: In Vitro Cellular & Developmental Biology). The sodium salt form enhances its solubility in aqueous systems. Additionally, it functions as a protein-binding dye in electrophoresis and has been used in studies of lipoprotein metabolism due to its ability to bind plasma proteins (source: Journal of Lipid Research).