Scent Fraction Analysis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F22%3A43924456" target="_blank" >RIV/60461373:22340/22:43924456 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Scent Fraction Analysis

Popis výsledku v původním jazyce

Human scent is a material, which is constantly and uncontrollably emitted into the air. This fact makes thescent trace suitable for evidence in criminal trials. For scent identification in police practice, an olfactorymethod is used. This method is based on the comparison of trace collected on the crime scene to the scentcollected from a suspect, using specially trained canines. However, the olfactory method is subjectivewhich means the method is loaded with random error. That is why there has been an effort to analyse the scenttrace using laboratory instrumentation as an objective method. For this purpose, GC×GC–MS/TOF is used,because this instrumentation has achieved the best possible resolution so far.In our study1 there was an effort to combine both of these methods to reveal new information about thecontent of the scent trace. After collection and extraction, the scent was fractionated into six fractions (F1– F6) by PFC with increasing volatility level.2 By means of the olfactory method, each fraction was comparedto the full scent of the same origin. In this experiment, the phenomenon of the multiplicity of the scentsignature was confirmed which means that the canines were able to identify the full scent with more than onefraction of the same origin.1 Unfortunately, a particular fraction(s) has not yet been found that would be moresignificant for identification than any of the others. However, these experiments are ongoing, so much morecan be discovered in future studies.

Název v anglickém jazyce

Scent Fraction Analysis

Popis výsledku anglicky

Human scent is a material, which is constantly and uncontrollably emitted into the air. This fact makes thescent trace suitable for evidence in criminal trials. For scent identification in police practice, an olfactorymethod is used. This method is based on the comparison of trace collected on the crime scene to the scentcollected from a suspect, using specially trained canines. However, the olfactory method is subjectivewhich means the method is loaded with random error. That is why there has been an effort to analyse the scenttrace using laboratory instrumentation as an objective method. For this purpose, GC×GC–MS/TOF is used,because this instrumentation has achieved the best possible resolution so far.In our study1 there was an effort to combine both of these methods to reveal new information about thecontent of the scent trace. After collection and extraction, the scent was fractionated into six fractions (F1– F6) by PFC with increasing volatility level.2 By means of the olfactory method, each fraction was comparedto the full scent of the same origin. In this experiment, the phenomenon of the multiplicity of the scentsignature was confirmed which means that the canines were able to identify the full scent with more than onefraction of the same origin.1 Unfortunately, a particular fraction(s) has not yet been found that would be moresignificant for identification than any of the others. However, these experiments are ongoing, so much morecan be discovered in future studies.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10406 - Analytical chemistry

Projekt

<a href="/cs/project/VJ01010123" target="_blank" >VJ01010123: Identifikace pachatele pomocí forenzní analýzy pachových a dotykových stop zajištěných na místě činu</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů