P. Schaeffer et al., NOVEL AROMATIC CAROTENOID DERIVATIVES FROM SULFUR PHOTOSYNTHETIC BACTERIA IN SEDIMENTS, Tetrahedron letters, 38(48), 1997, pp. 8413-8416
Novel aromatic carotenoid derivatives 7 and 8 have been identified by
synthesis of reference compounds in a H-2/PtO2-hydrogenated fraction f
rom the organic extract of a lake sediment (lake Cadagno, Switzerland)
. They derive from unreported carotenoids presumably biosynthesized by
purple sulfur photosynthetic bacteria (Chromatiaceae) and represent p
otential biomarkers to establish the occurrence of photic zone anoxia
in ancient ecosystems. (C) 1997 Elsevier Science Ltd.