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NCJ Number: NCJ 179740     Find in a Library
Title: Trace Evidence Analysis of Human Hair by On-line Supercritical Fluid Extraction-Gas Chromatography/Mass Spectrometry: A Feasibility Study (NIJ Report 600-99)
Author(s): Bruce A. Benner Jr. ; Jeffrey A. Degrasse
Corporate Author: National Institute of Standards and Technology (NIST)
United States of America
Date Published: 12/1999
Page Count: 43
Sponsoring Agency: US Dept of Justice
National Institute of Justice
Office of Science and Technology
United States of America
Contract Number: 94-IJ-R-004;
Sale Source: NCJRS Photocopy Services
Box 6000
Rockville, MD 20849-6000
United States of America

National Law Enforcement and Corrections Technology Center (NLECTC)
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Bldg. 181, Room 1L30
Gaithersburg, MD 20879
United States of America
Document: PDF 
Type: Report (Technical)
Language: English
Country: United States of America
Annotation: The surface components of small samples of human hair were analyzed in a preliminary study to determine the feasibility of using on-line supercritical fluid extraction-gas chromatography/mass spectrometry (SFE-GC/MS) for analyzing such samples.
Abstract: The study took place because SFE-GC/MS has been proposed as a method for characterizing samples that consist of only micrograms to 1 milligram of sample of material. The methods offers a number of benefits. These include increased sensitivity compared with liquid extraction methods, as well as higher recoveries of volatile species that would be lost during a multistep liquid extraction and concentration. SFE-GC/MS may be the only way of obtaining qualitative and semiquantitative chemical information from a sample in some sample-limited cases. The current research used hair samples of 100 micrograms to 1 milligram of hair collected from 20 volunteers by a procedure approved by the National Institute of Standards and Technology Human Ethics Research Board. The research sought to distinguish children's hair from adults' hair by the relative abundances of squalene and cholesterol, to determine of analyses produced consistent profiles of individuals' hairs and distinguished them from the hair of other individuals, and to use a blind procedure to match blind samples with hair samples from the same individuals. Results suggested that analysis of the surface components of small hair samples by SFE-GC/MS may help match hair samples taken at a crime scene with those of specific individuals. Findings support the desirability of further study of a number of factors that could influence the chemical profile of the surface components from an individual's hair, as well as the reproducibility of that chemical profile. Figures, tables, footnotes, 6 suggested readings, and appended SFE-GC/MS chromatograms of the 20 hair samples
Main Term(s): Science and Technology
Index Term(s): Trace evidence ; Victim identification ; Suspect identification ; Hair and fiber analysis ; Scientific techniques
   
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https://www.ncjrs.gov/App/Publications/abstract.aspx?ID=179740

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