FORMATION OF MESOPYROPHAEOPHORBIDE A DURING ANAEROBIC BACTERIAL-DEGRADATION OF THE MARINE PRYMNESIOPHYTE EMILIANIA- HUXLEYI

J M Getliff, M A Teece, N Spooner, R J Parkes, J W Leftley, P G Harris, J R Maxwell

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Abstract

The transformations undergone by chlorophyll a under anoxic conditions have been simulated by using the widespread marine prymnesiophyte Emiliania huxleyi as a substrate for a mixed bacterial community by incubation in a sediment slurry under sulphate reducing conditions. This resulted in the formation of pyrophaeophytin a after 77 days, along with smaller amounts of phaeophorbide a, pyrophaeophorbide a and mesopyrophaeophorbide a, from an original pigment distribution comprising mainly phaeophytin a, with a lower abundance of chlorophyll a. Mesopyrophaeophorbide a has not been reported previously as a product of any chlorophyll a defunctionalization study. Its formation under the conditions used suggests that the reduction of the C-3 vinyl substituent, required for transformation of chlorophyll a to a number of sedimentary porphyrins and chlorins, is a process which involves anaerobic bacterial communities.
Original languageEnglish
Pages (from-to)225-229
Number of pages5
JournalORG GEOCHEM
Volume22
Issue number1
Publication statusPublished - 1995

Keywords

  • Geochemistry & Geophysics
  • LACUSTRINE CHLOROPHYLL DIAGENESIS
  • HERBIVORE
  • SEDIMENTS

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