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- W2017090251 abstract "Free fatty acids and sterols were assessed in fresh manure and anaerobic lagoon sludge from swine production facilities in North Carolina. Eight free fatty acids and five sterols were identified and quantified in both manure and sludge samples. Compound identification was performed by gas chromatography/mass spectroscopy (GC-MS), and compound quantities were determined by gas chromatography after solid phase extraction with a 50:50 mixture of diethyl ether and hexane. The free fatty acids occurring in greatest abundance in both fresh manure and lagoon sludge were palmitic, oleic, and stearic. Free fatty acid content in fresh manure ranged from approximately 3 μ g g−1 dry weight (dw) to over 45 μ g g−1 dw. In lagoon sludge, free fatty acid content ranged from about 0.8 μ g g−1 dw to nearly 4 μ g g−1 dw. Coprostanol and epicoprostanol were the sterols in largest concentrations in fresh manure and lagoon sludge samples. Total sterol content ranged from approximately 0.5 μ g g−1 dw to around 11 μ g g−1 dw in fresh manure and from 3.5 μ g g−1 dw to almost 9 μ g g−1 dw in lagoon sludge. Fresh manure and lagoon sludge both had high levels of inorganic cations (e.g., Ca, Mg, Fe) capable of binding free fatty acids and forming insoluble complexes, thereby potentially reducing fatty acid biodegradation. In anaerobic lagoons, sterols are an organic fraction of sludge that are resistant to bacterial degradation. In the case of fresh manure, fatty acids could represent a potential source of energy via the manufacture of biodiesel fuel, if efficient means for their extraction and transesterification can be devised." @default.
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- W2017090251 date "2006-01-01" @default.
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- W2017090251 title "Free Fatty Acids and Sterols in Swine Manure" @default.
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- W2017090251 doi "https://doi.org/10.1080/03601230500234877" @default.
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