Abstract
A new type of chlorophyll catabolite was isolated from extracts of de-greened primary leaves of barley (Hordeum vulgare cv. Lambic). Its constitution was elucidated by one-dimensional and two-dimensional [(1)H,(13)C]-homo- and heteronuclear NMR spectroscopic techniques and by high resolution mass spectroscopy. The isolated catabolite, a water-soluble, colorless, and nonfluorescent linear tetrapyrrole, resembles urobilinogen in which one of the propionic side chains forms a five membered isocylic ring system, indicating its origin from the chlorophylls.
Highlights
A new type of chlorophyll catabolite was isolated from extracts of de-greened primary leaves of barley
This work focuses on the isolation and determination of the constitution of a new type of chlorophyll catabolite by spectroscopic methods and discusses the origin and relevance in the catabolic pathway of the chlorophylls in plants
The similarity of the structures of the red Chl catabolites (3, 4) isolated from the green alga Chlorella protothecoides with the colorless catabolites isolated from higher plants (5–7) suggest a close relationship in the basic skeleton
Summary
A new type of chlorophyll catabolite was isolated from extracts of de-greened primary leaves of barley This work focuses on the isolation and determination of the constitution of a new type of chlorophyll catabolite by spectroscopic methods and discusses the origin and relevance in the catabolic pathway of the chlorophylls in plants. The first structures of Chl catabolites isolated from a green alga and a higher plant were published in 1991 (3, 4).
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