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Your search keyword '"I. V. Persiyanova"' showing total 3 results
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3 results on '"I. V. Persiyanova"'

1. Syntheses in the purine derivative series

Author

I. V. Persiyanova, I. M. Ovcharova, E. S. Golovchinskaya, O. V. Kozlova, and L. A. Nikolaeva

Subjects
Pharmacology, Purine, chemistry.chemical_compound, Biochemistry, Chemistry, Drug Discovery, Pharmacology toxicology, Organic chemistry, Purine derivative
Published
1974
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2. Ionization constants of a number of alkaloids used in medicine

Author

I. E. Kopylova, I. V. Persiyanova, M. E. Perel'son, and T. S. Semenova

Subjects
Inorganic chemistry, Potentiometric titration, chemistry.chemical_element, Protonation, Plant Science, General Chemistry, Nitrogen, General Biochemistry, Genetics and Molecular Biology, chemistry.chemical_compound, Ultraviolet visible spectroscopy, Chelerythrine, chemistry, Ionization, Chelidonine, Sanguinarine
Abstract

The pKa values of a number of alkaloids in water or in aqueous ethanol have been measured by the potentiometric titration method: nuphleine — 4.59, 6.98; brevicolline — 5.17, 8.02; chelidonine — 6.40; sanguinarine — 7.32; chelerythrine — 7.53; stepharine — 8.48; d-pseudoephedrine — 9.49. For nuphleine and brevicolline, each of which has two nitrogen atoms capable of protonation, assignments have been made of pKa values to the corresponding atoms on the basis of the results of UV spectroscopy.

Published
1984
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