The stereochemistry of 2- and 3-hydroxy fatty acids in a Recent lacustrine sediment
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Hydroxy fatty acids in the surface Earth system
2024, Science of the Total EnvironmentInsoluble prokaryotic membrane lipids in a Sphagnum peat: Implications for organic matter preservation
2016, Organic GeochemistryCitation Excerpt :β-Hydroxy FAs are widespread and typically generated from the oxidation of monocarboxylic acids (Volkman et al., 1998). However, the short chain counterparts (C14–C18) are likely associated with bacterial cell walls (Cranwell, 1981) and are found in most recent sediments (Kawamura and Ishiwatari, 1982; Cardoso and Eglinton, 1983). A lower diversity of compounds was identified in the non-extractable fractions (BHy and AMe; Fig. 2).
Bound lipid biomarkers in sediments from El Junco Lake, Galápagos Islands
2014, Organic GeochemistryCitation Excerpt :A similar distribution of α-hydroxy acids was also found in the H+ labile fractions (Fig. 1b). Although α-hydroxy acids with chain lengths greater than C20 were attributed to α-oxidation of fatty acids in sediments (Cranwell, 1981b), they may also have a microalgal origin. Indeed, C26 (2-hydroxy hexacosanoic acid) to C30 (2-hydroxy triacontanoic acid) α-hydroxy acids were identified in some freshwater eustigmatophytes (Volkman et al., 1998), and C22–C30 α-hydroxy acids were reported in 30 species of freshwater green microalgae from the genus Choricystis (Fawley and Metzger, unpublished data).
Water column distribution of phospholipid-derived fatty acids of marine microorganisms in the Humboldt Current system off northern Chile
2009, Deep-Sea Research Part II: Topical Studies in OceanographyHydroxy fatty acids in marine dissolved organic matter as indicators of bacterial membrane material
2003, Organic GeochemistryCitation Excerpt :Because acid hydrolysis is required to free amide-bound moieties (e.g., Ramadas Bhat and Carlson, 1992), hydroxy acids thus recovered, whether in particulate matter or sediments, are attributed to bacterial LPS. Cranwell (1981) suggested that extractable hydroxy acids in sediments are formed by oxidative degradation of fatty acids (Lehninger, 1975), while bound hydroxy acids derive directly from bacterial membranes. Goossens et al. (1986) therefore proposed that sedimentary β-hydroxy-acids recovered by acid hydrolysis represent an exclusively bacterial origin, and indeed, β-hydroxy-acids had already been used as an assay for Gram negative bacteria in sediments (Parker et al., 1982).