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The cyclic nature of soil chemistry: Forensic analysis with the aid of ultra-high performance liquid chromatography. TALANTA OPEN 2022. [DOI: 10.1016/j.talo.2022.100126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Evaluating geostatistical methods along with semi-destructive analysis for forensic provenancing organic-rich soils in humid subtropical climate. Forensic Sci Int 2022; 341:111508. [DOI: 10.1016/j.forsciint.2022.111508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 09/30/2022] [Accepted: 10/30/2022] [Indexed: 11/07/2022]
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Norazwani binti Ali, Lee LC, Ishak AA. Evaluation of Row-wise Manipulations for the Forensic Differentiation of Malaysian Soils based on Ultra-performance Liquid Chromatographic Profiles. JOURNAL OF ANALYTICAL CHEMISTRY 2022. [DOI: 10.1134/s1061934822030029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Lee LC, Ishak AA, Nai Eyan AA, Zakaria AF, Kharudin N, Noor NAM. Forensic profiling of non-volatile organic compounds in soil using ultra-performance liquid chromatography: a pilot study. Forensic Sci Res 2021; 7:761-773. [PMID: 36817254 PMCID: PMC9930814 DOI: 10.1080/20961790.2021.1899407] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
Soil is of particular interest to the forensic community because it can be used as valuable associative evidence to link a suspect to a victim or a crime scene. Liquid chromatography is a powerful analytical tool for organic compound analysis. Recently, high-performance liquid chromatography (HPLC) has proven to be an efficient method for forensic soil analysis, especially in discriminating soils from proximity locations. However, ultra-performance liquid chromatography (UPLC), which is much more sensitive than HPLC, has never been explored in this context. This study proposed a UPLC method for profiling non-volatile organic compounds in three Malaysian soils (red, brown and yellowish-brown soils). The three soils were analysed separately to assess the effects of individual chromatographic parameters: (a) elution programme (isocratic vs. two gradient programmes); (b) flow rate (0.1 vs. 0.2 mL/min); (c) extraction solvent (acetonitrile vs. methanol) and (d) detection wavelength (230 vs. 254 nm). The injection volume and total run time were set to 5 µL and 35 min, respectively. Consequently, each soil sample gave 24 different chromatograms. Results showed that the most desirable chromatographic parameters were (a) isocratic elution; (b) flow rate at 0.2 mL/min and (c) acetonitrile extraction solvent. The proposed UPLC system is expected to be a feasible method for profiling non-volatile organic compounds in soil, and is more chemical-efficient than a comparable HPLC system.
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Affiliation(s)
- Loong Chuen Lee
- Program of Forensic Sciences, Centre for Diagnostic, Therapeutic & Investigative Studies, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Bangi, Malaysia,Institute of IR 4.0, Universiti Kebangsaan Malaysia, Bangi, Malaysia,CONTACT Loong Chuen
| | - Ab Aziz Ishak
- Program of Forensic Sciences, Centre for Diagnostic, Therapeutic & Investigative Studies, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Bangi, Malaysia
| | - Ameeta A/P Nai Eyan
- Program of Forensic Sciences, Centre for Diagnostic, Therapeutic & Investigative Studies, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Bangi, Malaysia
| | - Anas Fahmi Zakaria
- Program of Forensic Sciences, Centre for Diagnostic, Therapeutic & Investigative Studies, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Bangi, Malaysia
| | - Nurul Syahiera Kharudin
- Program of Forensic Sciences, Centre for Diagnostic, Therapeutic & Investigative Studies, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Bangi, Malaysia
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McCulloch G, Dawson LA, Ross JM, Morgan RM. The discrimination of geoforensic trace material from close proximity locations by organic profiling using HPLC and plant wax marker analysis by GC. Forensic Sci Int 2018; 288:310-326. [PMID: 29778501 DOI: 10.1016/j.forsciint.2018.02.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 01/08/2018] [Accepted: 02/12/2018] [Indexed: 11/15/2022]
Abstract
There is a need to develop a wider empirical research base to expand the scope for utilising the organic fraction of soil in forensic geoscience, and to demonstrate the capability of the analytical techniques used in forensic geoscience to discriminate samples at close proximity locations. The determination of wax markers from soil samples by GC analysis has been used extensively in court and is known to be effective in discriminating samples from different land use types. A new HPLC method for the analysis of the organic fraction of forensic sediment samples has also been shown recently to add value in conjunction with existing inorganic techniques for the discrimination of samples derived from close proximity locations. This study compares the ability of these two organic techniques to discriminate samples derived from close proximity locations and finds the GC technique to provide good discrimination at this scale, providing quantification of known compounds, whilst the HPLC technique offered a shorter and simpler sample preparation method and provided very good discrimination between groups of samples of different provenance in most cases. The use of both data sets together gave further improved accuracy rates in some cases, suggesting that a combined organic approach can provide added benefits in certain case scenarios and crime reconstruction contexts.
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Affiliation(s)
- G McCulloch
- UCL Department of Security and Crime Science, 35 Tavistock Square, London WC1H 9EZ, United Kingdom; UCL Centre for the Forensic Sciences, 35 Tavistock Square, London WC1H 9EZ, United Kingdom
| | - L A Dawson
- James Hutton Institute, Craigiebuckler, Aberdeen AB15 8QH, United Kingdom; Forensic Soil Science Group, Aberdeen AB15 8QH, United Kingdom
| | - J M Ross
- James Hutton Institute, Craigiebuckler, Aberdeen AB15 8QH, United Kingdom; Forensic Soil Science Group, Aberdeen AB15 8QH, United Kingdom
| | - R M Morgan
- UCL Department of Security and Crime Science, 35 Tavistock Square, London WC1H 9EZ, United Kingdom; UCL Centre for the Forensic Sciences, 35 Tavistock Square, London WC1H 9EZ, United Kingdom.
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Kirby M. Forensic sciences at 50: past, present and future? AUST J FORENSIC SCI 2018. [DOI: 10.1080/00450618.2018.1438770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Michael Kirby
- Honorary Life Member and Former President of the Academy
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