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Porphyrin and chlorin distributions in a Late Pliocene lacustrine sediment

Authors
Journal
Geochimica et Cosmochimica Acta
0016-7037
Publisher
Elsevier
Volume
58
Issue
17
Identifiers
DOI: 10.1016/0016-7037(94)90159-7
Disciplines
  • Biology

Abstract

Abstract The tetrapyrroles in a highly immature Late Pliocene lacustrine sediment (Willershausen, Germany) show a simple distribution of both chlorin and porphyrin components as the free bases. The major components are C32 desoxophylloerythroaetioporphyrin (DPEP), a C33 bicycloalkano porphyrin, the chlorin analogue of the latter, and desoxophylloerythrin and its chlorin counterpart. The structure of the novel bicycloalkano chlorin was determined using a combination of two-dimensional phase-sensitive COSY NMR and nOe studies. Measurements of δ13C and other data indicate that DPEP and the bicycloalkano porphyrin were derived from the chlorophyll(s) of photosynthetic organisms utilising a common source of CO2, probably diatoms. The occurrence of DPEP and other minor alkyl porphyrins indicates that the chlorophyll defunctionalisation pathway leading to these components can occur at low temperature and was probably biologically mediated, as was the condensation reaction leading to the fused ring components.

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