5-Sulfosalicylic Acid Dihydrate丨CAS 5965-83-3

5-Sulfosalicylic acid dihydrate is widely used as an analytical reagent, pharmaceutical intermediate, and specialty chemical in laboratory and industrial applications. In analytical chemistry, it is commonly employed for protein precipitation and detection, particularly in biochemical and clinical analyses where selective protein removal or quantification is required. The compound is also used in metal ion analysis due to its strong chelating ability, forming stable complexes with iron, aluminum, and other metal ions for colorimetric and spectroscopic determination. In pharmaceutical and chemical research, it serves as an intermediate in the synthesis of sulfonated aromatic compounds and functional excipients. Additionally, it is applied in dye and pigment chemistry, electroplating processes, and surface treatment formulations, where its acidic and chelating properties are beneficial.

5-Sulfosalicylic acid dihydrate offers several advantages derived from its multifunctional aromatic structure. The presence of sulfonic acid, carboxylic acid, and phenolic hydroxyl groups provides strong acidity, excellent water solubility, and effective metal-binding capability. These properties enable high sensitivity and selectivity in analytical applications, especially for protein precipitation and metal ion detection. The dihydrate form enhances handling and stability, ensuring consistent performance during storage and use. Its compatibility with aqueous systems and common laboratory conditions allows easy integration into analytical protocols, industrial formulations, and research workflows, delivering reliable and reproducible results.