Microbial phospholipid fatty acid distribution associated with pig fatty tissue buried in oil palm plantation soil
2018
Nur Anisah Daud | Siti Sofo Ismail
Estimation of postmortem interval (PMI) is one of the challenges faced in forensic investigations. Such difficulty is caused by the influence of environmental factors towards decomposition process. Thus, it is crucial to conduct this study to investigate the concentration of phospholipid fatty acids in associated carrion soils as one of the forensic markers. A simulated burial experiment was carried out in controlled laboratory. The fatty flesh of a commercial pig (Sus scrofa) was buried in an oil palm plantation soil, mimicking a burial in a shallow grave. The fatty flesh was allowed to decompose for 365 days of burial period. The associated soil was collected at each designated sampling point, representing each decomposition stage. The associated soil was analysed in an attempt to identify the concentration of phospholipids fatty acids in the soil. The saturated fatty acid (SAFA) was found to have the highest concentration, i.e. 312.94 mg/g soil dry weight. Furthermore, the associated soils demonstrated a significant different (p<0.05) in the concentration of phospholipids fatty acids (PLFAs) between decomposition days. The saturated PLFAs of palmitic acid (C16:0) demonstrated the highest concentration, followed by stearic acid (C18:0) acids. These PLFA components also exhibited a significant different (p≤0.05) in concentration between decomposition days. The concentration of microbial PLFAs in burial environments may indicate the potential of microbial PLFAs to be developed as a useful tool to estimate post-mortem interval.
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