Die Einzelkomponenten der Bacteriophäophorbidmethylester von Bacteriochlorophyll c und d / The Individual Components of Bacteriophaeophorbide Methyl Esters from Bacteriochlorophyll c and d

Abstract

<jats:title>Abstract</jats:title><jats:p> 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 <jats:sup>1</jats:sup>H NMR spectra of the pure components are discussed.</jats:p>

Antenna organization in green photosynthetic bacteria. 1. Oligomeric bacteriochlorophyll c as a model for the 740 nm absorbing bacteriochlorophyll c in Chloroflexus aurantiacus chlorosomes

“…Similar oligomers using BChl c from C. aurantiacus have not been reported. C. aurantiacus belongs to a taxonomic group (Chlorofiexaceae) that is only distantly related to the Chlorobiaceae (Gibson et al, 1985), and BChl c from C. aurantiacus is structurally different from BChl c in the Chlorobiaceae (Caple et al, 1978;Gloe & Risch, 1978;Kemmer et al, 1979;Risch et al, 1979;Smith et al, 1980Smith et al, , 1983b. Specifically, BChl c from C. aurantiacus reportedly contains only ethyl and methyl substituents at positions 4 and Gloe and Risch (1978) showing the labeling system used here.…”

Bacteriochlorophylls-d from Chlorobium vibrioforme: chromatographic separations and structural assignments of the methyl bacteriopheophorbides

“…Bmph-c [Pr",Et] (Bands 3 and 4) is an (R,S) mixture, while Bmph-c [Bu',Et] (Band 1) is almost completely (S) . Brockmann had claimed that the configuration at 2a was exclusively (R).9*' 7 It was apparent then that, according to his analytical methods, as much as 10% (Bands 1 and 3) of the (2s) Bmphs-c could go undetected in the homologous mixture. We therefore decided to see whether the Bmphs-d also consisted of a mixture of (R) and (S) diastereoisomers.…”

How green is green chemistry? Chlorophylls as a bioresource from biorefineries and their commercial potential in medicine and photovoltaics

“…20,29,30 The brownish-purple Bchls a 8 and b 9 are bacteriochlorins (7,8,17,18-tetrahydroporphyrins) and are found in photosynthetic purple bacteria (Rhodospirillales). Other compounds are Chl d 6 from cyanobacteria, the green bacteriochlorophylls c, d, and e 7 (which, despite the name, are chlorins, i.e.…”

“…They are found in Chlorobiaceae and Chloroflexaceae and can occur as mixtures of homologs with different peripheral substituents. 20,29,30 The brownish-purple Bchls a 8 and b 9 are bacteriochlorins (7,8,17,18-tetrahydroporphyrins) and are found in photosynthetic purple bacteria (Rhodospirillales). 31 Other examples are Bchl g from heliobacteria and many of the (bacterio)chlorophylls occur with different esterified alcohols.…”