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Unusual fatty acids in the fat body of the early nesting bumblebee, Bombus pratorum.

Authors
  • Cvacka, Josef
  • Kofronová, Edita
  • Vasícková, Sona
  • Stránský, Karel
  • Jiros, Pavel
  • Hovorka, Oldrich
  • Kindl, Jirí
  • Valterová, Irena
Type
Published Article
Journal
Lipids
Publication Date
May 01, 2008
Volume
43
Issue
5
Pages
441–450
Identifiers
DOI: 10.1007/s11745-008-3174-5
PMID: 18365265
Source
Medline
License
Unknown

Abstract

Unusual fatty acids with 24, 26, and 28 carbon atoms were found in triacylglycerols (TAGs) isolated from fat body tissue of bumblebee Bombus pratorum. The most abundant one was (Z,Z)-9,19-hexacosadienoic acid. Its structure was determined by mass spectrometry after derivatization with dimethyl disulfide and by infrared spectroscopy. ECL (equivalent chain length) values of its methyl ester were determined on both DB-1 and DB-WAX capillary columns. (Z,Z)-9,19-Hexacosadienoic acid is quite rare in nature. So far it has been identified only in marine sponges, and this work is the first evidence of its occurrence in a terrestrial organism. HPLC/MS analysis of the bumblebee TAGs showed that (Z,Z)-9,19-hexacosadienoic acid is present in one third of all TAG molecular species. As it was found in all sn-TAG positions, it is likely that (Z,Z)-9,19-hexacosadienoic acid is transported to tissues. Interestingly, labial gland secretion of B. pratorum was found to contain (Z,Z)-7,17-pentacosadiene, a hydrocarbon with markedly similar double bond positions and geometry. Possible biosynthetic relationships between these two compounds are discussed.

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