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Application of capillary electrophoresis in the analysis of coloring matter on paper

100%
Król M.
Nowa kodyfikacja prawa karnego
|
2017
|
vol. 44
23-40
EN
Modern law enforcement agencies are constantly struggling with crimes against documents. Due to increasing quality of counterfeit documents and different physicochem­ical properties of inks, such crimes are becoming harder to detect. This situation obliges forensic laboratories for the development and implementation of testing procedures with the use of some modern techniques of chemical analysis. CE opens up numerous possibilities for various analytical applications, mainly due to its numerous advantages, the diversity of its modes and the compatibility with different detection systems. This study focuses on discussing two modes of CE: CZE and MECC and three different detection systems: DAD, LIF and MS. By using them information about substances exhibiting absorption, fluorescence and about molecular mass of analyzed compound can be received. In the Laboratory for Forensic Chemistry many different coloring matters were examined, including ballpoint, fountain pen, gel and stamp pad inks in most popular colors as well as a large group of branded and off-brand printing inks. The obtained results showed the great applicability of CE-DAD method. It has been proved that LIF and MS detections improve the discriminating possibilities of CE provid­ing additional information on samples.
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Azotan MDMA (3,4-metylenodioksymetamfetaminy) – nietypowa postać soli czy nowy trend na rynku narkotyków?

72%
dr Bachliński R., Galarda M.
Problemy Kryminalistyki
|
2017
|
issue 296
37-45
PL
W niniejszym artykule przedstawiony został przypadek wystąpienia na nielegalnym rynku narkotykowym nietypowej postaci 3,4-metylenodioksymetamfetaminy (MDMA) w formie azotanu. Związek taki bardzo dobrze można zidentyfikować jedynie poprzez zastosowanie metod analitycznych, których nie wykorzystuje się rutynowo w badaniach kryminalistycznych tego typu substancji – elektroforezy kapilarnej (CE) czy skaningowej mikroskopii elektronowej (SEM). Należy więc być bardzo czujnym w przypadkach, gdy badania metodą chromatografii gazowej sprzężonej ze spektrometrią masową (GC-MS) jednoznacznie identyfikują badaną substancję, ale już badania w spektrofotometrii w podczerwieni tego nie potwierdzają.
EN
The article presents a case involving an appearance of an atypical 3,4-methylenedioxymethamphetamine (MDMA) in the form of nitrate on the illicit drug market. This compound can be identified only by using such analytical methods as capillary electrophoresis (CE) or scanning electron microscopy (SEM), which are not routinely applied to forensic analyses of this type of substances. Therefore, particular caution should be exercised whenever a gas chromatography-mass spectrometry (GC-MS) method unambiguously identifies a substance, yet infrared spectroscopy fails to confirm this result.
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