@article{fdi:010042255,
  title = {{P}entacyclic triterpene methyl ethers in recent lacustrine sediments ({L}agoa do {C}aco, {B}razil)},
  author = {{J}acob, {J}. and {D}isnar, {J}.{R}. and {B}oussafir, {M}. and {A}lbuquerque, {A}.{L}.{S}. and {S}ifeddine, {A}bdelfettah and {T}urcq, {B}runo},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he lipid extracts of sediments collected from the {Q}uaternary filling of a tropical lacustrine series ({L}agoa do {C}aco, {B}razil) were investigated using gas chromatography-mass spectrometry ({GC}-{MS}). {V}arious pentacyclic triterpene 3-methyl ethers ({PTME}s) were present in the neutral fraction. {C}omparison of retention times and mass spectra with available standards allowed us to confirm the presence of olean-12-en-3beta-ol {ME} (beta-amyrin {ME}), olean-18-en-3beta-ol {ME} (miliacin), taraxer- 14-en-3beta-ol {ME} (crusgallin), fern-9(l {I})-en-3beta-ol {ME} (arundoin) and arbor-9(11)-en-3beta-ol {ME} (cylindrin). {T}he following other compounds could also be tentatively identified from their {GC}-{MS} characteristics: urs-12-en-3beta-ol {ME}, bauer-7-en-3beta-ol {ME} and fern-8-en-3beta-ol {ME}. {O}ther compounds such as possible 3alpha isomers of the {PTME}s as well as di- or tri-unsaturated counterparts might be {PTME} diagenetic derivatives. {A}ccording to previous chemotaxonomic studies, all these compounds most probably originate from {G}ramineae that used to colonize the savanna of {N}orthern {B}razil at the time of deposition. ({C}) 2004 {E}lsevier {L}td. {A}ll rights reserved.},
  keywords = {},
  booktitle = {},
  journal = {{O}rganic {G}eochemistry},
  volume = {36 (3)},
  numero = {},
  pages = {449--461},
  ISSN = {0146-6380},
  year = {2005},
  DOI = {10.1016/j.orggeochem.2004.09.005},
  URL = {https://www.documentation.ird.fr/hor/fdi:010042255},
}