Abstract：
:A series of C30 branched isoprenoid hydrocarbons with a cyclobotryococcane skeleton were identified in the Florida Coastal Everglades Ecosystem. Nine such C30 alkenes were detected and identified as five-membered ring monocyclic hydrocarbons with an identical parent structure of 7,11-cyclobotryococcane based on their mass spectra and hydrogenation behavior. Previous reports have suggested Botryococcus Braunii or green sulfur bacteria (Chlorobiaceae) as likely sources of these 7,11-cyclobotryococcanes. However, their enriched δ13C values (about -18%) determined in this study and their absence in freshwater marsh environments of the Everglades suggest that an origin from green sulfur bacteria or possibly marine diatoms is more likely. The depth profile of individual C30 cyclobotryococcenes in one sediment core from Florida Bay shows abundant variations in their historical deposition and may indicate long-term changes of their source strength due to variations in local environmental conditions.
journal_name
Chemospherejournal_title
Chemosphereauthors
Xu Y,Jaffé Rdoi
10.1016/j.chemosphere.2010.07.060subject
Has Abstractpub_date
2010-11-01 00:00:00pages
918-24issue
7eissn
0045-6535issn
1879-1298pii
S0045-6535(10)00854-4journal_volume
81pub_type
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