« Previous AbstractRust and Thinning Management Effect on Cup Quality and Plant Performance for Two Cultivars of Coffea arabica L    Next AbstractTargeted killing of Streptococcus mutans by a pheromone-guided 'smart' antimicrobial peptide »

J Forensic Sci

Title:		Performance evaluation of the Scent Transfer Unit (STU-100) for organic compound collection and release
Author(s):		Eckenrode BA; Ramsey SA; Stockham RA; Van Berkel GJ; Asano KG; Wolf DA;
Address:		"Federal Bureau of Investigation, Counterterrorism/Forensic Science Research Unit, FBI Academy, Quantico, VA 22135, USA. baeckenrode@fbiacademy.edu"
Journal Title:		J Forensic Sci
Year:		2006
Volume:		51
Issue:		4
Page Number:		780 - 789
DOI:		10.1111/j.1556-4029.2006.00178.x
ISSN/ISBN:		0022-1198 (Print) 0022-1198 (Linking)
Abstract:		"The Scent Transfer Unit (STU-100) is a portable vacuum that uses airflow through a sterile gauze pad to capture a volatiles profile over evidentiary items for subsequent canine presentation to assist law enforcement personnel. This device was evaluated to determine its ability to trap and release organic compounds at ambient temperature under controlled laboratory conditions. Gas chromatography-mass spectrometry (GC-MS) analyses using a five-component volatiles mixture in methanol injected directly into a capture pad indicated that compound release could be detected initially and 3 days after the time of collection. Additionally, 15 compounds of a 39-component toxic organic gaseous mixture (10-1000 parts per billion by volume [p.p.b.(v)]) were trapped, released, and detected in the headspace of a volatiles capture pad after being exposed to this mixture using the STU-100 with analysis via GC-MS. Component release efficiencies at ambient temperature varied with the analyte; however, typical values of c. 10% were obtained. Desorption at elevated temperatures of reported human odor/scent chemicals and colognes trapped by the STU-100 pads was measured and indicated that the STU-100 has a significant trapping efficiency at ambient temperature. Multivariate statistical analysis of subsequent mass spectral patterns was also performed"
Keywords:		Animals Dogs Forensic Medicine/*instrumentation Gas Chromatography-Mass Spectrometry Humans Odorants/*analysis Organic Chemicals/*chemistry Principal Component Analysis Volatilization;
Notes:		"MedlineEckenrode, Brian A Ramsey, Scott A Stockham, Rex A Van Berkel, Gary J Asano, Keiji G Wolf, Dennis A eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2006/08/03 J Forensic Sci. 2006 Jul; 51(4):780-9. doi: 10.1111/j.1556-4029.2006.00178.x"