Original scientific paper

Studies on the Spectra of Protoberberine Alkaloids. II. Absorption Spectrum of Jatrorrhizine

Z. Gašparec ; Department of Forensic Medicine, Medical Faculty, University of Zagreb, Zagreb, Croatia, Yugoslavia
K. Weber ; Department of Forensic Medicine, Medical Faculty, University of Zagreb, Zagreb, Croatia, Yugoslavia

Abstract

Measurements have been made on the visible and UV absorption
spectra of jatrorrhizine chloride in pure aqueous, methanol,
ethanol a nd propa nol solutions and in the p resence of various
concentrations of e ither hydrochloric acid or potass ium h ydroxid e.
In all the solutions, potassium hydroxide conside rably modifies
the absorption curves. The modifications b ecome manifest in the
disappearance of the absorption maximum and in the appearance
of new bathochromic shifted maxima. In these changes isobestic
points were noticed in the absorption curves. At very high potassium
hydroxide concentrations in ethanol and propanol solutions, the
absorption maximum disappears from the vis ible region of the
spectrum.
It has been suggested that the addition of potassium hydroxide
causes the formation of the quinonoidic form of jatrorrhizine. The
carbinolic form probably appears only in ethanol and propanol
solutions.

Keywords

Hrčak ID:

208083

URI

https://hrcak.srce.hr/208083

Publication date:

15.10.1967.

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