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Accumulation of Explosives in HairPart 3: Binding Site Study

NCJ Number
Journal of Forensic Sciences Volume: 57 Issue: 3 Dated: May 2012 Pages: 623-635
Jimmie C. Oxley Ph.D.; James L. Smith Ph.D.; Louis J. Kirschenbaum Ph.D.; Suvarna Marimiganti Ph.D.; Irene Efremenko Ph.D.; Raya Zach; Yehuda Zeiri Ph.D.
Date Published
May 2012
13 pages
This study extends previous work on the sorption of explosives to the hair matrix.
This study extends previous work on the sorption of explosives to the hair matrix. Specifically, the researchers have studied the interaction of 2,4,6-trinitrotoluene (TNT) and triacetone triperoxide (TATP) as a function of chemical pretreatment with acetonitrile, neutral and alkaline hydrogen peroxide, methanolic KOH and potassium permanganate, and the morphological changes that accompany these treatments. While differences in vapor pressure can account for quantitative differences between TNT and TATP sorption, both are markedly affected by the chemical rinses. Examination of the hair surface shows different degrees of smoothening following rinsing, suggesting that the attachment to hair is largely a surface phenomenon involving the 18-methyleicosanoic acid lipid layer. Density functional theory calculations were employed to explore possible nucleation sites of TATP microcrystals on the hair. The researchers conclude that some of the sites on melanin granular surfaces may support nucleation of TATP microcrystals. Moreover, the calculations support the experimental finding that dark hair adsorbs explosives better than light hair. Abstract published by arrangement with John Wiley & Sons.