Sewoong Heo

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The rapid increase in the number of new psychoactive substances and their abuse is the most recent drug abuse issue worldwide. Although abuse of synthetic cannabinoids is highly restricted in South Korea, the rapid increase in the number of new substances is forcing the legal regulation authority to continuously improve the drug regulation act. As a result(More)
Shortly after we reported the seizure of the amphetamine derivative N,α-diethylphenethylamine (NADEP) as bulk powder, we have identified NADEP in preworkout supplements branded as “Craze” and sold via the Internet. A gas chromatography–mass spectrometry method was validated and used to quantitate NADEP in the supplements. The authentic NADEP sample of the(More)
A crystalline powder was found in an unclaimed lost article shipped from Vietnam to South Korea, and it was seized by narcotics agents as an item of suspicious trade. The chemical was suspected to be methamphetamine crystals, and was sent to the National Forensic Service for forensic identification. Elucidation of the chemical structure was carried out(More)
Four herbal incense products were seized from suspected drug abusers in Korea. The major ingredients in the herbal incense samples were purified, and their structures were elucidated using gas chromatography–electron ionization–mass spectrometry (GC–EI–MS), liquid chromatography–time-of-flight–mass spectrometry (LC–TOF–MS), and 1D and 2D nuclear magnetic(More)
A rapid and simple gas chromatography-mass spectrometry (GC-MS) method was developed and validated to identify and quantify synthetic cannabinoids in the materials seized during drug trafficking. Accuracy and reproducibility of the method were improved by using deuterated JWH-018 and JWH-073 as internal standards. Validation results of the GC-MS method(More)
Some methamphetamine (MA) crystals contain pharmaceutical impurities. They often come from the co-ingredients of cold drugs used for extracting ephedrine or pseudoephedrine. Though these impurities are not so commonly encountered, they reflect the trends in precursor chemicals and manufacturing sources. As a result of monitoring impurities in the MA(More)
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