| | 2 | Author
| Thorsten Kemmer, Hans Brockmann, Nikolaus Risch | Requires cookie* | | | Title
| Die Einzelkomponenten der Bacteriophäophorbidmethylester von Bacteriochlorophyll c und d The Individual Components of Bacteriophaeophorbide Methyl Esters from Bacteriochlorophyll c and d  | | | | Abstract
| The preparative column chromatographic separation on small grained silica gel of the bacteriophaeophorbide-c-and -d-methyl esters into their homologous and isomeric components is described. The influence of particular regions of the molecule, which carry different alkyl-substituents, on the chromatographic separability is selectively enhanced through the variation of the eluent. Mass and ifl NMR spectra of the pure components are discussed. Einführung Von den in Chlorobiaceae vorkommenden Bacterio-chlorophyllen c und d ist schon seit den Untersuchun-gen von Holt und Mitarbeitern [1, 2] bekannt, daß sie in der Natur als komplexe Gemische isomerer und homologer Verbindungen vorkommen. Eine Trennung in die einzelnen Komponenten ist für die aus den Chlorophyllen durch Hydrolyse leicht zu-gänglichen Phäophorbide durch Verteilen zwischen Ether und Salzsäure an Celite-Säulen beschrieben worden [3-5]. Wieweit dabei die einzelnen Kompo-CH3 nenten wirklich in reiner Form erhalten wurden, ist heute schwer zu überprüfen; bei den sich anschlie-ßenden physikalischen und chemischen Untersu-chungen wurden nämlich zum Teil widersprüchliche Resultate erhalten [6, 7]. Dennoch konnten Holt und Mitarbeiter [1, 2] aus ihren Untersuchungs-ergebnissen die Konstitutionsformeln 1 und 2 für die Bacteriochlorophylle c und d ableiten, die trotz zeitweiliger Kritik [7-9] durch neuere Arbeiten nur bestätigt wurden [10, 11]. Chlorobium-Bacteriochlorophylle cd) und d(2) | | | |
Reference
| Z. Naturforsch. 34b, 633—637 (1979); eingegangen am 10. August 1978 | | | |
Published
| 1979 | | | |
Keywords
| Chromatography, Separation, Bacteriochlorophylls, X H NMR | | | |
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| default:Reihe_B/34/ZNB-1979-34b-0633.pdf | | | | Identifier
| ZNB-1979-34b-0633 | | | | Volume
| 34 | |
| 3 | Author
| Steiner, W. Schäfer, I. Bios, H. W. Ieschhoff, H. Scheer | Requires cookie* | | | Title
| R | | | | Abstract
| Bacteriochlorophyll b (bchl b) has been isolated from the halophilic photosynthetic bacterium, Ectothiorhodospira halochloris. The pigment and a series o f derivatives thereof are different from Bchl b from Rhodopseudomonas viriais by HPLC analysis, but similar by uv-vis spectroscopy. The chromatographic difference originates in different esterifying alcohols in the two pigments. The one from Rp. viridis (Bchl bp) is esterified with zl2-phytaenol (phytol), that from E. halochloris (Bchl b42,io) with zf2,10-phytadienol. The structure o f the latter has been established by isolation of the alcohol from the purified pigment, followed by (i) gaschromatography-mass spectroscopy and (ii) ozonolysis and dinitrophenylhydrazon-formation o f the cleavage products, which were identified by gaschromatography-mass spectroscopy as 6-methyl-heptan-2-one, and 4-methyl-nona-1,8-dione. | | | |
Reference
| Z. Naturforsch. 36c, 417 (1981); received February 26 1981 | | | |
Published
| 1981 | | | |
Keywords
| Photosynthesis, Photosynthetic Bacteria, Halophilic Bacteria, Bacteriochlorophylls, Diterpenoid Alcohols | | | |
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| default:Reihe_C/36/ZNC-1981-36c-0417.pdf | | | | Identifier
| ZNC-1981-36c-0417 | | | | Volume
| 36 | |
| 4 | Author
| R. Steiner, E. Cm, H. Scheer | Requires cookie* | | | Title
| Chemistry of Bacteriochlorophyll b: Identification of Some (Photo)Oxidation Products | | | | Abstract
| Photoreactions o f bacteriochlorophyll b have been studied. They all arise from reactions at the A8,8' double-bond. The A7,8-isom erisation product 3 is formed under anaerobic conditions. Irradiation in the presence o f oxygen leads to three products arising from an autoxidation reaction involving singlet oxygen. The structures o f two o f them (4, 5) have been established from their m ethylpheophorbides 10 and 11 containing an 8-acetyl and 8-(m eth)oxyethyl-substituent, respectively, in addition to the isom erized A7,8-double bond. | | | |
Reference
| Z. Naturforsch. 38c, 748—7 (1983); received June 15 1983 | | | |
Published
| 1983 | | | |
Keywords
| Bacteriochlorophyll, Ethylidene Group, Isomerisation, O xidation, Photosynthesis | | | |
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| default:Reihe_C/38/ZNC-1983-38c-0748.pdf | | | | Identifier
| ZNC-1983-38c-0748 | | | | Volume
| 38 | |
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