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Stable isotope analysis of human hair and nail samples: the effects of storage on samples

Fraser, Isla and Meier-Augenstein, Wolfram and Kalin, Robert M. (2008) Stable isotope analysis of human hair and nail samples: the effects of storage on samples. Journal of Forensic Sciences, 53 (1). pp. 95-99.

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    When submitting samples for analysis, maintaining sample integrity is essential. Appropriate packaging must be used to prevent damage, contamination or loss of sample. This is particularly important for stable isotope analysis by isotope ratio mass spectrometry as this technique is capable of detecting subtle differences in isotopic composition with great precision. In a novel study, scalp hair and fingernail samples were placed in five different types of packaging, routinely used in forensic laboratories and stored for 6 weeks and 6 months. Samples were subsequently cleaned and submitted for 13C/12C, 15N/14N, 2H/1H and 18O/16O analysis. Results from 13C analysis indicate that type of packaging can cause slight changes in 13C abundance over time. Differences were noted in the 15N isotope signatures of both hair and nail samples after 6-week storage, but not after 6 months. This apparent discrepancy could be a result of the packaging not being properly sealed in the 6 weeks study. Fewer differences were noted when analyzing samples for 2H and 18O abundance.

    Item type: Article
    ID code: 28982
    Keywords: forensic science , isotope ratio, mass spectometry, coatings, hair, Forensic Medicine. Medical jurisprudence. Legal medicine , Physical and theoretical chemistry, Genetics, Pathology and Forensic Medicine
    Subjects: Medicine > Public aspects of medicine > Forensic Medicine. Medical jurisprudence. Legal medicine
    Science > Chemistry > Physical and theoretical chemistry
    Department: Faculty of Science > Pure and Applied Chemistry
    Faculty of Engineering > Civil and Environmental Engineering
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      Depositing user: Pure Administrator
      Date Deposited: 29 Mar 2011 14:38
      Last modified: 05 Sep 2014 13:08

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