Transformation reactions and recycling of carotenoids and chlorins in the Peru upwelling region (15°S, 75°W)

Details Transformation reactions and recycling of carotenoids and chlorins in the Peru upwelling region (15°S, 75°W) Transformation reactions and recycling of carotenoids and chlorins in the Peru upwelling region (15°S, 75°W)

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.1265r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 48, Issue 6, pp.1265-1277

Physics

3

Scientific paper

Total chlorins and carotenoids were measured in suspended paniculate matter, sediment trap, and zooplankton fecal pellet samples collected in the Peru upwelling region. Individual carotenoids were analyzed by high pressure liquid chromatography and mass spectrometry. Fucoxanthin, diadinoxanthin, diatoxanthin, carotene, and peridinin constitute > 95% of the total carotenoid pigments in suspended paniculate matter samples. However, sediment trap and zooplankton fecal pellet samples contained significant amounts of the carotenoid transformation products fucoxanthinol, fucoxanthin 5'-dehydrate, fucoxanthinol 5'-dehydrate, peridininol and peridininol 5'-dehydrate. These samples were further characterized by high values of the ratio fucoxanthinol/total fucopigments ( f / F t ) and low values of the ratio total carotenoids /total chlorins. Three reactions are proposed to account for the formation of observed products: heterotrophic ester hydrolysis, chemically mediated epoxide rearrangement, and microbially mediated dehydration. The distribution of specific transformation products within the samples suggests that heterotrophic ester hydrolysis is a general transformation pathway operative in the water column on a wide suite of organic esters. Epoxide rearrangement and dehydration appear to occur over a longer time scale and are more typical of sedimentary environments.

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