In the course of a quantitative study of the distribution of cytochrome c in cancer tissue a consideration of the available methods of analysis led to the development of an improved method which has been applied to this particular study.l The method has been used under such a variety of conditions that it is believed that it will give satisfactory results if applied to other problems involving ...

This paper proposes new methods for simple and sensitive spectrophotometric and fluorimetric determination of naltrexone (NALT) in tablet and biological fluids. The spectrophotometric method involve addition of a known excess of Ce(IV) to NALT in acid medium, followed by determination of residual Ce(IV) by reacting with a fixed amount of methyl orange, and measuring the absorbance at 510 nm. Fl...

BACKGROUND Ascorbic acid is one of the most important vitamins to monitor in dietary sources (juices and vitamins) and biological liquids. RESULTS Silica and silica-titania xerogels doped with Mo,P-heteropoly compounds (HPC) have been synthesized varying titanium(IV) and HPC content in sol. Their surface area and porosity have been studied with nitrogen adsorption and scanning electron micros...

The spectrophotometric methods M6, M7, M8 and M10 for the determination of Zolmitriptan in pure and dosage forms have been described in this paper. The present methods involve the determination of Zolmitriptan in pharmaceutical dosage at the given optimum conditions. The stock solution (1.0 mg/mL) of Zolmitriptan was prepared by dissolving 100 mg of the drug in 10.0 mL of methanol and made up t...

the acid-base equilibrium of lorazepam was studied by means of potentiometry andmultiwavelengths spectrophotometry. the stoichiometric equilibrium constants were determinedat 25 °c and constant ionic strength 0.1 mol l-1 (nacl). the acidity constants pk1=1.58±0.05and pk2=11.67±0.07 were found by potentiometry, and pk1=1.54±0.02 and pk2=11.61±0.03 bymulti-wavelengths spectrophotometry. potentiom...