Chemical Name: 4,4′-Dithiodipyridine
CAS: 2645-22-9

Appearance: white or pale yellow powder
Molar absorptivity: ≥14,000 at 235 nm
MW: 220.32, C10H8N2S2

Storage Condition : ambient temperature
Shipping Condition: ambient temperature


Product Description
2-PDS and 4-PDS are used for the photometric determination of thiol groups in biological samples. These compounds react with the thiol groups at pH 5 to form mercaptopyridine. The maximum wavelengths of 2-Mercaptopyridine and 4-Mercaptopyridine are 343 nm and 324 nm, respectively.

1) D. R. Grassetti, et al., Determination of Sulfhydryl Groups with 2, 2 E or 4, 4 EDithiodipyridine. Arch Biochem Biophys. 1967;119:41-49.
2) R. E. Humphrey, et al., Spectrophotometric Determination of Sulfite with 4, 4 EDithiodipyridine and 5, 5 EDithiobis-(2-nitrobenzoic acid). Anal Chem. 1970;42:698-702.
3) R. E. Humphrey, et al., Spectrophotometric Determination of Cyanide with Organic Disulphides. Talanta. 1971;18:491-497.
4) T. Uete, et al., Spectrophotometric Micromethod for Measuring Cholinesterase Activity in Serum or Plasma. Clin Chem. 1972;18:454-458.

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