Abstract
In cold extracts of senescent leaves of the Lime tree (Tilia cordata), two colorless nonfluorescent chlorophyll catabolites (NCCs) were identified, named Tc-NCC-1 and Tc-NCC-2, as well as a polar yellow chlorophyll catabolite (YCC), named Tc-YCC. The constitution of the two NCCs was determined by spectroscopic means. In addition, a tentative structure was derived for Tc-YCC. The three chlorophyll degradation products exhibited tetrapyrrolic structures, as are typical of NCCs or YCCs, and turned out to be rather polar, due to a glucopyranosyl group at their 82-position. At their 3-positions, the more polar Tc-NCC-1 carried a 1,2-dihydroxyethyl group and the less polar Tc-NCC-2 a vinyl group. Tc-YCC was identified as the product of an oxidation of Tc-NCC-1.
Highlights
Introduction. – Chlorophyll biosynthesis and chlorophyll breakdown are fascinating natural life processes on earth [1], which can be observed from outer space [2]
Several recent observations suggested the existence of divergent pathways of chlorophyll breakdown in higher plants
Structures of Nonfluorescent Chlorophyll Catabolites Found in Senescent Leaves of Higher Plants
Summary
Introduction. – Chlorophyll biosynthesis and chlorophyll breakdown are fascinating natural life processes on earth [1], which can be observed from outer space [2]. Structures of Nonfluorescent Chlorophyll Catabolites Found in Senescent Leaves of Higher Plants (the labels R1 to R4 refer to the general constitutional formula of NCCs in the Scheme; atoms numbered according to their original position in chlorophyll a) – In a cold MeOH extract of yellow (senescent) fall leaves of a lime tree (Tilia cordata), two polar colorless and nonfluorescent chlorophyll catabolites (NCCs) and a yellow chlorophyll catabolite (YCC) were provisionally identified by analytical HPLC, on the basis of their characteristic UV-absorbance properties (see Fig. 1) [24] [32].
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