Gao Min, Simoneit Bernd R T, Gantar Miroslav, Jaffé Rudolf
Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199, USA.
Chemosphere. 2007 Dec;70(2):224-36. doi: 10.1016/j.chemosphere.2007.06.056. Epub 2007 Aug 3.
A high abundance of isoprenoid hydrocarbons, the botryococcenes, with carbon numbers from 32 to 34 were detected in the Florida Everglades freshwater wetlands. These compounds were present in varying amounts up to 106microg/gdw in periphyton, 278microg/gdw in floc, and 46microg/gdw in soils. Their structures were determined based on comparison to standards, interpretation of their mass spectra and those of their hydrogenation products, and comparison of Kovats indexes to those reported in the literature. A total of 26 cyclic and acyclic botryococcenes with 8 skeletons were identified, including those with fewer degrees of unsaturation, which are proposed as early diagenetic derivatives from the natural products. This is the first report that botryococcenes occur in the Everglades freshwater wetlands. Their potential biogenetic sources from green algae and cyanobacteria were examined, but neither contained botryococcenes. Thus, the source implication of botryococcenes in this ecosystem needs further study.
在佛罗里达大沼泽地淡水湿地中检测到大量碳数为32至34的类异戊二烯烃——葡萄藻烯。这些化合物在不同物质中的含量各不相同，在附生植物中高达106微克/克干重，在絮凝物中为278微克/克干重，在土壤中为46微克/克干重。通过与标准品比较、对其质谱及其氢化产物的质谱进行解析，以及将科瓦茨指数与文献报道的指数进行比较，确定了它们的结构。总共鉴定出26种具有8种骨架的环状和非环状葡萄藻烯，包括不饱和度较低的那些，它们被认为是天然产物的早期成岩衍生物。这是关于葡萄藻烯存在于大沼泽地淡水湿地的首次报道。研究了它们可能来自绿藻和蓝细菌的生物源，但两者都不含葡萄藻烯。因此，葡萄藻烯在这个生态系统中的来源仍需进一步研究。
