Premium
THE INFLUENCE OF pH ON THE SPECTROSCOPIC CHARACTERISTICS OF SOME PHENANTHRENIC ALKALOIDS
Author(s) -
Chakraborty S.,
Nandi R.,
Maiti M.,
Achari B.,
Bandyopadhyay S.
Publication year - 1989
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1989.tb04327.x
Subject(s) - fluorescence , chemistry , aristolochic acid , absorption (acoustics) , absorption spectroscopy , glucoside , photochemistry , materials science , biology , medicine , genetics , physics , alternative medicine , pathology , quantum mechanics , composite material
— The absorption and fluorescence characteristics of aristolochic acid, aristololactam, N‐ methyl aristololactam and aristololactam‐ß‐D‐glucoside have been studied at neutral pH. Absorption and fluorescence characteristics of the alkaloids have been evaluated from their UV‐visible spectra, the fluorescence emission and excitation spectra, and quantum yields. The effect of pH in the range 1.0–14.0 on the structure of the alkaloids has also been investigated. A pH dependent reversible change in the absorption and fluorescence spectra is obtained with aristololactam and aristololactam‐ß‐D‐glucoside. It is suggested that the pH dependent properties of aristololactam and aristololactam‐ß‐D‐glucoside are due to the formation of lactam ⇄ lactim and phenanthrenic lactam ⇄ amino phenanthrenic acid, respectively.