The degradation rates of some sterols in a heated sediment

Details The degradation rates of some sterols in a heated sediment The degradation rates of some sterols in a heated sediment

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1663d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 6, pp.1663-1666

Physics

Scientific paper

Samples of a lacustrine sediment characterized by a high content of desmethylstanols, 5 -, 5,22 -desmethylsterols and 4-methylstanols were heated from 12 to 48 hours at 175°C under anoxic conditions in order to measure the thermal degradation rates of the various free sterols. The results show that: i) the thermal degradation of sterols under these conditions follows first order kinetics; ii) desmethylstanols and 5 -desmethylsterols degrade with similar rate constants; iii) 5,22 -desmethylsterols are less stable than desmethylstanols; iv) 4-desmethylstanols are significantly more stable than desmethylsterols with regard to thermal degradation; and v) the fact that the steroidal ketones do not seem to be degraded is due to the balance of their oxidative formation from the sterols and their degradation.

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