Photolysis of thiochrome in aqueous solution: A kinetic study.

The photolysis of thiochrome (THC), an oxidation product of thiamine (vitamin B) (THE), used for its fluorimetric assay, has been studied in the pH range 7.0-12.0.

Validation of a UV Spectrometric Method for the Assay of Tolfenamic Acid in Organic Solvents.

The present study has been carried out to validate a UV spectrometric method for the assay of tolfenamic acid (TA) in organic solvents. TA is insoluble in water; therefore, a total of thirteen commonly used organic solvents have been selected in which the drug is soluble. Fresh stock solutions of TA in each solvent in a concentration of 1 × 10(-4 )M (2.