Conversion of sedimentary fatty acids from extractable (unbound + bound) to tightly bound form during mild heating |
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| Authors: | Kimitaka Kawamura Ryoshi Ishiwatari |
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| Institution: | Department of Chemistry, Faculty of Science, Tokyo Metropolitan University, 2-1-1 Fukazawa, Setagaya, Tokyo, Japan |
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| Abstract: | Prolonged heating (1–248 days) of a recent sediment was conducted under mild conditions (65 and 83°C) to understand the thermal behavior of extractable (unbound and bound) fatty acids (C12C32). In the course of the heating, the concentrations of saturated and monounsaturated fatty acids first decreased, and then increased. This indicates that extractable fatty acids can be converted to a tightly bound form upon heating, before fatty acids are extensively released from sediment matrices. Changes in molecular distributions of extractable fatty acids upon heating were also observed. The higher molecular weight fatty acids (?C20) are more likely to become tightly bound than are lower molecular weight (<C20). Monounsaturated fatty acids (C16:1 and C18:1) are more easily converted to the tightly bound form than polyunsaturated fatty acids (C18:2 and C18:3). These differences probably reflect their mode of occurrence in sediments, which are closely related to their origin. |
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| Keywords: | sediment fatty acids heating experiment conversion of existing forms extractable tightly bound |
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