DTNB (Ellman's Reagent) is a chemical used for quantifying the amount or concentration of sulfhydryl groups. It is often used to detect free sulfhydryl groups. DTNB is also an allosteric inhibitor of dengue virus protease (NS2B-NS3Pro) and Streptomyces protease.
| Molecular Weight | 396.35 |
| Formula | C14H8N2O8S2 |
| CAS Number | 69-78-3 |
| Solubility (25°C) | DMSO ≥ 60 mg/mL |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
| Species | Mouse | Rat | Rabbit | Guinea pig | Hamster | Dog |
| Weight (kg) | 0.02 | 0.15 | 1.8 | 0.4 | 0.08 | 10 |
| Body Surface Area (m2) | 0.007 | 0.025 | 0.15 | 0.05 | 0.02 | 0.5 |
| Km factor | 3 | 6 | 12 | 8 | 5 | 20 |
| Animal A (mg/kg) = Animal B (mg/kg) multiplied by | Animal B Km |
| Animal A Km |
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.
[3] Joshua B Owen, et al. Methods Mol Biol. Measurement of oxidized/reduced glutathione ratio
[4] M R Toon, et al. Biochim Biophys Acta. Binding of DTNB to band 3 in the human red cell membrane
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