title: Occurrence of 12-methyltridecanal in microorganisms and physiological samples isolated from beef.
abstract: 12-Methyltridecanal (MT) smelling tallowy, beef-like was formed from plasmalogens when beef was boiled. To clarify the origin of MT, its concentration was determined by a stable isotope dilution assay in bacteria and protozoa isolated from the rumen of bovine animals as well as in the plasma, erythrocytes, and other physiological samples. The highest amounts of MT were found in bacteria followed by protozoa. The MT content of the erythrocytes was small. The results support the hypothesis that microorganisms are the main source of MT of which a small amount is resorbed by the animal and transported to the muscular tissue where MT is incorporated into plasmalogens.
authors.affiliation: Deutsche Forschungsanstalt für Lebensmittelchemie (DFA), Lichtenbergstrasse 4, D-85748 Garching, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Kerscher
authors.forename: K
authors.initials: K
authors.lastname: Nürnberg
authors.forename: J
authors.initials: J
authors.lastname: Voigt
authors.forename: P
authors.initials: P
authors.lastname: Schieberle
authors.forename: W
authors.initials: W
authors.lastname: Grosch
mesh_terms: D000018:Abomasum; D000447:Aldehydes / Q000032:analysis* / Q000097:blood; D000821:Animal Feed; D000818:Animals; D001419:Bacteria / Q000737:chemistry / Q000302:isolation & purification*; D002417:Cattle; D004912:Erythrocytes / Q000737:chemistry; D056890:Eukaryota / Q000737:chemistry / Q000302:isolation & purification*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D005766:Gastrointestinal Contents / Q000737:chemistry / Q000382:microbiology / Q000469:parasitology; D007421:Intestine, Small; D008297:Male; D012417:Rumen / Q000737:chemistry* / Q000382:microbiology / Q000469:parasitology
chemical_list: D000447:Aldehydes; C095952:12-methyltridecanal