Compositional similarities of non-solvent extractable fatty acids from recent marine sediments deposited in differing environments

Journal Article · Mon Jun 01 00:00:00 EDT 1987 · Geochim. Cosmochim. Acta; (United States)

DOI:https://doi.org/10.1016/0016-7037(87)90321-8· OSTI ID:6894520

Nishimura, M; Baker, E W

Five recent sediment samples from a variety of North American continental shelves were analyzed for fatty acids (FAs) in the solvent-extractable (SOLEX) lipids as well as four types of non-solvent extractable (NONEX) lipids. The NONEX lipids were operationally defined by the succession of extraction procedure required to recover them. The complete procedure included (i) very mild acid treatment, (ii) HF digestion and (iii) saponification of the sediment residue following exhaustive solvent extraction. The distribution pattern and various compositional parameters of SOLEX FAs in the five sediments were divided into three different groups, indicating the difference of biological sources and also diagenetic factors and processes among the three groups of samples. Nevertheless, the compositions of the corresponding NONEX FAs after acid treatment were surprisingly very similar. This was also true for the remaining NONEX FA groups in the five sediment samples. The findings implied that most of the NONEX FAs reported here are derived directly from living organisms. It is also concluded that a large part of NONEX FAs are much more resistant to biodegradation than the authors have thought, so that they can form the large percentage of total lipids with increasing depth of water and sediments.

• Research Organization: Florida Atlantic Univ., Boca Raton (USA)
• OSTI ID: 6894520
• Journal Information: Geochim. Cosmochim. Acta; (United States), Vol. 51:6
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
59 BASIC BIOLOGICAL SCIENCES
CONTINENTAL SHELF
SEDIMENT-WATER INTERFACES
SEDIMENTS
BIOGEOCHEMISTRY
DIAGENESIS
CARBOXYLIC ACIDS
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
LIPIDS
SOLVENT EXTRACTION
CHEMISTRY
CONTINENTAL MARGIN
EXTRACTION
GEOCHEMISTRY
INTERFACES
ORGANIC ACIDS
ORGANIC COMPOUNDS
SEPARATION PROCESSES
580400* - Geochemistry- (-1989)
550200 - Biochemistry