Abstract
Sterols were detected in Lake Mendota, Wisconsin and Torch Lake. Michigan. water and sediment and in Lake Wingra. Wisconsin, sediment. These sterols included compounds with gas chromatographic retention times equal to those for coprostanol, cholesterol, stigmasterol and β-sitosterol as well as other, unidentified compounds. In addition, cholestanol and perhaps other saturated sterols were present in Lake Mendota sediment. Sterol concentrations were 0.8 μg cholesterol/1 and 3 μg β-sitosterol/1 in Lake Mendota water and 0.7 μg cholesterol/1 and 2 μg β-sitosterol/1 in Torch Lake water. Analysis of sediment sterols was probably not quantitative; however, the minimum concentration in Torch Lake sediment was about 3 ppm sterols on a dry weight basis. Both free sterols and sterol esters were present in Lake Mendota sediment, the sterols present as esters comprising roughly 10% of the total sterol content.
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