Tightly bound aliphatic acids in Lake Biwa sediments: Their origin and stability
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2022, Soil Biology and BiochemistryCitation Excerpt :However, the chemical degradation cannot release all the bound lipids (Lee et al., 2019). The thermal pyrolysis was harsher than the chemical degradation, thereby releasing more tightly-bound lipid biomarkers (Kawamura and Ishiwatari, 1982, 1984; Lee et al., 2019). The full release of bound organics is featured by the maximum amounts of compounds gained at a certain pyrolysis temperature.
Global calibration of novel 3-hydroxy fatty acid based temperature and pH proxies
2021, Geochimica et Cosmochimica ActaCitation Excerpt :Acid digestion is a more appropriate method than saponification to extract them from soil and stalagmite samples (Wang et al., 2016; Yang et al., 2016). So far 3-OH-FAs have been found in soils (Huguet et al., 2019; Wang et al., 2016; Zelles, 1999), speleothems (Blyth et al., 2006; Huang et al., 2008; Wang et al., 2018; Wang et al., 2012), snow (Tyagi et al., 2016; Tyagi et al., 2015), aerosols (Lee et al., 2004), marine dissolved organic matter (DOM) (Wakeham et al., 2003), marine and lake sediments (Kawamura and Ishiwatari, 1984; Volkman et al., 1980; Wakeham, 1999; Wang et al., 2016; Yang et al., 2020; Zhang et al., 2014), and a 3-OH-FA based proxy for sea surface temperature (RAN13) has recently been proposed (Yang et al., 2020) suggesting the potential for wide application if proxies based on 3-OH-FA are available. Because Gram-negative bacteria are ubiquitous, 3-OH-FAs proxies could be applied to diverse archives, providing cross-correlation between speleothems (Wang et al., 2018), lake sediments, palaeosols and marine records (Yang et al., 2020).
Fatty acids and other biomarkers in two Early Jurassic concretions and their immediate host rocks (Lias δ Buttenheim clay pit, Bavaria, Germany)
2018, Organic GeochemistryCitation Excerpt :Saturated C16- and C18 FA – Abundant 16:0 and 18:0 in the kerogen of the concretions point to a second distinctive pool of FA that was not amenable by extraction, including mild alkaline saponification. These FA may represent “tightly bound” FA (cf. Kawamura and Ishiwatari, 1984) that have been encased in the carbonate or in pores of the kerogen and thus escaped extraction, which were only released after pyrolytic disruption of the matrix. Whereas these compounds seem to be linked to the concretions, their source is difficult to elucidate.
Hydroxy fatty acids in marine aerosols as microbial tracers: 4-year study on β- and ω-hydroxy fatty acids from remote Chichijima Island in the western North Pacific
2015, Atmospheric EnvironmentCitation Excerpt :A wide range of hydroxy fatty acids (FAs) are found in lipid fractions isolated from a variety of organisms (Downing, 1961) including bacteria (Wilkinson, 1988), algae (Blokker et al., 1998) and higher plants (Pollard et al., 2008; Molina et al., 2006). Several studies have been carried out to assess the abundances of hydroxy FAs in environmental samples such as lacustrine and marine sediments (Eglinton et al., 1968; Cardoso and Eglinton, 1983; Kawamura and Ishiwatari, 1984 a,b; Kawamura and Ishiwatari, 1982) and lake waters (Kawamura et al., 1987) as well as marine aerosols (Kawamura, 1995). Despite having their wide spread occurrence, unfortunately these compounds have received little attention from atmospheric chemists.
Bound lipid biomarkers in sediments from El Junco Lake, Galápagos Islands
2014, Organic GeochemistryOccurrence and distribution of glycerol dialkyl glycerol tetraethers in a French peat bog
2010, Organic Geochemistry
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Present address: Institute of Geophysics and Planetary Physics, University of California at Los Angeles, Los Angeles, California, U.S.A.