Dean, J. Cunningham and E. Stewart and S. Ewen Smith. Deneckere, P. Vandenabeele and L. Hargreaves and Howell G. Witkowski and Mary W.
Brewster and Royston Goodacre. Undetected location. NO YES. Infrared and Raman Spectroscopy in Forensic Science. Selected type: Hardcover.
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This book will provide a survey of the major areas in which information derived from vibrational spectroscopy investigations and studies have contributed to the benefit of forensic science, either in a complementary or a unique way. This is highlighted by examples taken from real case studies and analyses of forensic relevance, which provide a focus for current and future applications and developments. Permissions Request permission to reuse content from this site.www.atletismoextremo.com/components/map5.php
Université du Québec à Trois-Rivières - Département de chimie, biochimie et physique
Hargreaves 1. Hargreaves 2. The use of SERS requires the presence of a roughened surface made of metals or colloids 13, The advantage of SERS is the minute quantity of sample required, often seen at crime scenes. This also results in minimal damage to the original sample. In the present study we compare data obtained from various OTC and presciption medications using the two techniques. The powdered drug sample was placed onto the ATR crystal and pressure of 75psi was evenly applied and the sample spectrum was collected.
The sample was then cleaned from the crystal surface and an additional spectrum was collected for the next sample. A spectral range of — cm -1 was employed. The video camera was focused onto the slide and the laser was focused and applied twice for ten second intervals. The FT-IR and Raman spectra for the three compounds Caffeine, Acetaminophen and Aspirin contained peaks some overlapping corresponding to the functional groups present in their structures Fig 1, 2, 3.
Figure 1 Fig. Similarly data for Acetaminophen showed distinguishing peaks for N-H stretching at cm -1 along with peaks corresponding to the presence of OH group cm -1 and C-O stretching at cm -1 Fig 2a,b. Figure 2 Fig. Finally for Aspirin, the presence of a broad peak at cm -1 indicated the presence of a carboxylic group Fig. Figure 3 Fig. One difference between the spectra was the sharpness of the Raman peaks as compared to the FT-IR spectra.
Raman peaks tended to be narrower than their IR counterparts. Additionally, hydroxyl OH and carbonyl groups asymmetric, dipolar bonds showed stronger infrared IR peaks cm -1 and cm Figure 4 Fig. Similarly the C-H stretch of the methyl groups at cm -1 and the OH stretch of the carboxyl group at cm -1 could be attributed to similar peaks in Caffeine and Aspirin respectively.
When comparing the data obtained from both the techniques, the Raman spectra exhibited fewer peaks than the IR spectra Fig 4a and b.
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Additionally, since double bonds and aromatic structures are frequently present in narcotics as compared to the diluents and cutting agents, Raman spectra may provide more information in these mixtures. The Raman peaks also appear to be sharper and narrower than the IR peaks making it easier to resolve peaks in mixtures. The advantages of using FT-IR and Raman spectrosopy for detection of prescription drugs are that they give rapid data, are easy to use and are easily adaptable to the portable mode.
Even though both methods probe vibrations in molecules and showed similar profiles, striking differences were observed when comparing the spectra. The Raman spectra had the advantage of providing sharper peaks for symmetric bonds in aromatic compounds and those that contain double bonds often present in narcotics , while FT-IR showed stronger peaks for asymmetric hydroxyl and carbonyl groups. In addition fewer peaks of interest in Raman spectra may facilitate mixture analysis. Abstract One major issue faced by law enforcement is drug related crimes. Introduction According to the Federal Bureau of Investigation FBI , drugs are becoming more and more prominent as motivations for crimes.
Conclusions The advantages of using FT-IR and Raman spectrosopy for detection of prescription drugs are that they give rapid data, are easy to use and are easily adaptable to the portable mode. References 1. Impacts of Drugs on Society. National drug threat assessment Williams, J. Patel, V.
Holland, R. Scrivens, J. The use of recently described ionization techniques for the rapid analysis of some common drugs and samples of biological origin. Rapid Comm in Mass Spectrometry; ; Phinney, K. Edwards, Howell G. Wiley InterScience Online service.
Bibliography Includes bibliographical references and index. Summary This book will provide a survey of the major areas in which information derived from vibrational spectroscopy investigations and studies have contributed to the benefit of forensic science, either in a complementary or a unique way. This is highlighted by examples taken from real case studies and analyses of forensic relevance, which provide a focus for current and future applications and developments.
Subject Forensic sciences.
Infrared spectroscopy. Raman spectroscopy. Criminal investigation. Bibliographic information.