Giner, J. L.. State University of New York-ESF,
Boyer, G. L.. State University of New York-GSF,

The brown tide algae Aureococcus anophagefferens and Aureoumbra lagunensis are picoplanktonic algae responsible for "brown tides" along the New York and Texas coasts respectively. These algae are members of the newly described taxon Pelagophyceae. To date, only members of this class have been shown to contain the rare marine sterol 24-propylidenecholesterol. This sterol has a high molecular weight that makes it a useful biomarker for GC-MS analysis. This sterol accounts for 44% of the total sterols of Aureococcus anophagefferens, and 35% in Aureoumbra lagunensis. In Aureococcus anophagefferens, 24-propylidenecholesterol is found as 3:1 mixture of the E- and Z- double bond isomers, while in Aureoumbra lagunensis it is found almost exclusively in the E-form. A related rare sterol, 24-propylcholesterol, is found in Aureoumbra lagunensis. The stereochemistry of 24-propylcholesterol has not yet been determined. These rare sterols, as well as the remaining sterol profile, provide desirable biomarkers for automated GCMS analysis for identification and quantification of these algae.
Day: Thursday, Feb. 4
Time: 04:45 - 05:00pm
Location: Sweeney Center
Code: SS36TH0445S