Summary
The ionization constants of the 4′- and 7-OH groups in quercetin and of the 3-, 4′-, 5′-, and 7-OH groups in kaempferol have been determined by the spectrophotometric method. The sequence of their ionization has been established.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
Literature cited
N. A. Tyukavkina, N. N. Pogodaeva, and V. I. Lutskii, Khim. Prirodn. Soedin., 24 (1970).
N. A. Tyukavkina and N. N. Pogodaeva, Khim. Pirodn. Soedin., 11 (1971).
N. A. Tyukavkina and N. N. Pogodaeva, Khim. Prirodn. Soedin., 173 (1972).
V. A. Nazarenko, E. A. Biryuk, R. V. Ravitskaya, and V. P. Antonovich, Ukr. Khim. Zh.,34, 115 (1968).
K. S. R. Jagasia and B. C. Haldar, J. Indian Chem. Soc.,40, 287 (1963).
M. H. Fletcher, Analyt. Chem.,37, 550 (1965).
A. B. Blank and I. I. Mirenskaya, Zh. Anal. Khim.,27, 1883 (1972).
N. A. Tykavkina, K. I. Lapteva, L. D. Modonova, V. A. Larina and V. A. Pentegova, Phenolic Compounds and Their Biological Functions [in Russian], Moscow (1968), p. 72.
V. M. Peshkova and M. I. Gromova, Practical Handbook on Spectrophotometry and Colorimetry [in Russian], Moscow (1961), p. 41.
N. P. Komar', Tr. In-ta Khimii, KhGU,8, 57 (1951).
K. Doerfel', “Beurteilung von Analyseverfahren und.-ergibnisse”, Z. Anal. Chem.,185, 1–98 (1962) [Russian translation, as a book, Moscow (1969), pp. 29, 111].
Additional information
Irkutsk Institute of Organic Chemistry, Siberian Branch of the Academy of Sciences of the USSR. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 708–711, November–December, 1975.
Rights and permissions
About this article
Cite this article
Tyukavkina, N.A., Pogodaeva, N.N. Ultraviolet absorption of flavonoids VIII. Ionization constants of kaempferol and quercetin. Chem Nat Compd 11, 741–743 (1975). https://doi.org/10.1007/BF00568459
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00568459