Contrasted distributions of triterpene derivatives in the sediments of Lake Caçó reflect paleoenvironmental changes during the last 20,000 yrs in NE Brazil
Lipid fractions extracted from sediment layers deposited in a small Brazilian lake during the
last 20,000 yrs were investigated by gas chromatography–mass spectrometry. Considerable
differences in the distribution and the amount of triterpene derivatives in the aliphatic as well
as in the aromatic fractions were observed all along the series. Although no precise
identification of these compounds was undertaken, our interpretation of mass spectral data
allowed us to discriminate between des-A-triterpenes, mono-and triaromatic derivatives of …
last 20,000 yrs were investigated by gas chromatography–mass spectrometry. Considerable
differences in the distribution and the amount of triterpene derivatives in the aliphatic as well
as in the aromatic fractions were observed all along the series. Although no precise
identification of these compounds was undertaken, our interpretation of mass spectral data
allowed us to discriminate between des-A-triterpenes, mono-and triaromatic derivatives of …
以上显示的是最相近的搜索结果。 查看全部搜索结果