𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Carotenoids of Rhizobia. IV. Isolation and structure elucidation of the carotenoids of a mutant of Rhizobium lupini

✍ Scribed by Peter Beyer; Hans Kleinig; Gerhard Englert; Walter Meister; Klaus Noack

Publisher
John Wiley and Sons
Year
1979
Tongue
German
Weight
505 KB
Volume
62
Category
Article
ISSN
0018-019X

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The structures of the main carotenoid pigments from the mutant 1‐207 of Rhizobium lupini were elucidated by spectroscopic techniques (UV./VIS., CD., 270 MHz ^1^H‐NMR., and MS.). Ten carotenoids were identified, namely β,β‐carotene (1), β,β‐caroten‐4‐one (echinenone, 2), β,β‐carotene‐4,4′‐dione (canthaxanthin, 3), (3__S__)‐3‐hydroxy‐β,β‐caroten‐4‐one ((3__S__)‐3‐hydroxyechinenone, 4), (2__R__, 3__R__)‐β,β‐carotene‐2,3‐diol (5), (3__S__)‐3‐hydroxy‐β,β‐carotene‐4,4′‐dione ((3__S__)‐adonirubin, 6), (2__R__, 3__S__)‐2,3‐dihydroxy‐β,β‐caroten‐4‐one (7), (2__R__, 3__S__)‐2,3‐dihydroxy‐β,β‐caroten‐4,4′‐dione (8), (2__R__, 3__S__, 2′R, 3′R)‐2,3,2′,3′‐tetrahydroxy‐β,β‐caroten‐4‐one (9) and the corresponding (2__R__, 3__S__, 2′R, 3′S)‐4,4′‐dione (10). Structures 5, 7, 8 and 10 have not been reported before. From the observed carotenoid pattern it is concluded that in this mutant the oxidation to 4‐oxo compounds is favoured compared to the hydroxylation at C(3) and C(2).

📜 SIMILAR VOLUMES

Carotenoids of Rhizobia. I. New Caroteno
Carotenoids of Rhizobia. I. New Carotenoids from Rhizobium lupini
✍ Hans Kleinig; Wolfram Heumann; Walter Meister; Gerhard Englert 📂 Article 📅 1977 🏛 John Wiley and Sons 🌐 German ⚖ 371 KB

## Abstract The main pigments of __Rhizobium lupini__ were 2,3,2′,3′‐di‐__trans__‐tetrahydroxy‐β,β‐caroten‐4‐one and 2,3,2′,3′‐di‐__trans__‐tetrahydroxy‐β,β‐carotene. As minor components 7,8,7′,8′‐tetrahydro‐ψ, ψ‐carotene (ζ‐carotene), β, β‐carotene (β‐carotene), and tentatively, a 2,3,2′(or 3′)‐tr

Structural elucidation by 1D and 2D NMR
Structural elucidation by 1D and 2D NMR of three isomers of a carotenoid lysophosphocholine and its synthetic precursors
✍ Bente Jeanette Foss; Jostein Krane 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 248 KB

## Abstract A carotenoic acid was used to obtain a long‐chain unsaturated lysophosphocholine. The carotenoid lysophosphocholine was synthesized by two methods. The first method resulted in mixtures of regioisomers for each step in the synthetic route. Homo‐ and heteronuclear 1D and 2D NMR methods w