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Thomas A. Briellmann – One of the best experts on this subject based on the ideXlab platform.

  • Isolation of Δ9-THCA-A from hemp and Analytical aspects concerning the determination of Δ9-THC in cannabis products
    Forensic Science International, 2005
    Co-Authors: Franz E. Dussy, Cornelia Hamberg, Marco Luginbühl, Thomas Schwerzmann, Thomas A. Briellmann

    Abstract:

    A simple procedure based on a common silica gel column chromatography for the isolation of Delta9-tetrahydrocannabinolic acid A (Delta9-THCA-A) from hemp in a multi-milligram scale is presented. Further, the decarboxylation reaction of Delta9-THCA-A to the toxicologically active Delta9-tetrahydrocannabinol (Delta9-THC) at different Analytical and under-smoking conditions is investigated. Maximal conversion in an optimised Analytical Equipment yields about 70% Delta9-THC. In the simulation of the smoking process, only about 30 % of the spiked substance could be recovered as Delta9-THC.

  • isolation of δ9 thca a from hemp and Analytical aspects concerning the determination of δ9 thc in cannabis products
    Forensic Science International, 2005
    Co-Authors: Franz E. Dussy, Cornelia Hamberg, Marco Luginbühl, Thomas Schwerzmann, Thomas A. Briellmann

    Abstract:

    Abstract A simple procedure based on a common silica gel column chromatography for the isolation of Δ 9 -tetrahydrocannabinolic acid A (Δ 9 -THCA-A) from hemp in a multi-milligram scale is presented. Further, the decarboxylation reaction of Δ 9 -THCA-A to the toxicologically active Δ 9 -tetrahydrocannabinol (Δ 9 -THC) at different Analytical and under-smoking conditions is investigated. Maximal conversion in an optimised Analytical Equipment yields about 70% Δ 9 -THC. In the simulation of the smoking process, only about 30 % of the spiked substance could be recovered as Δ 9 -THC.

D. Benanou – One of the best experts on this subject based on the ideXlab platform.

  • Characterization of volatile and semivolatile compounds in waste landfill leachates using stir bar sorptive extraction–GC/MS
    Analytical and Bioanalytical Chemistry, 2009
    Co-Authors: L. Badoil, D. Benanou

    Abstract:

    Stir bar sorptive extraction in combination with thermal desorption coupled online to capillary gas chromatography–mass spectrometry was applied to investigate volatile and semivolatile fractions in two waste leachate samples: old and fresh ones. The present study helps to improve our knowledge of waste leachate organic composition. The aim is to then make use of this knowledge afterwards in order to generate more reliable and specific treatment processes for waste leachates and thus to respect the environmental statute law regarding their rejection. The volatile and semivolatile compounds appeared to be mainly anthropogenic in origin. Moreover, lactic acid and cyclic octaatomic sulfur could potentially be used as microbiological activity indicators, since they occur during organic matter degradation processes within waste leachates. Figure TDU-CGC-MS Analytical Equipment

Myoung Choul Choi – One of the best experts on this subject based on the ideXlab platform.

  • Development of Wien filter for small ion gun of surface analysis.
    Review of Scientific Instruments, 2016
    Co-Authors: Jungbae Bahng, Jonggi Hong, Myoung Choul Choi

    Abstract:

    The gas cluster ion beam (GCIB) and liquid metal ion beam have been studied in the context of ion beam usage for Analytical Equipment in applications such as X-ray photoelectron spectroscopy and secondary ion mass spectroscopy (SIMS). In particular, small ion sources are used for the secondary ion generation and ion etching. To set the context to this study, the SIMS project has been launched to develop ion-gun based Analytical Equipment for the Korea Basic Science Institute. The objective of the first stage of the project is the generation of argon beams with a GCIB system [A. Kirkpatrick, Nucl. Instrum. Methods Phys. Res., Sect. B 206, 830–837 (2003)] that consists of a nozzle, skimmer, ionizer, acceleration tube, separation system, transport system, and target. The Wien filter directs the selected cluster beam to the target system by exploiting the velocity difference of the generated particles from GCIB. In this paper, we present the theoretical modeling and three-dimensional electromagnetic analysis …

  • Development of Wien filter for small ion gun of surface analysis.
    Review of Scientific Instruments, 2016
    Co-Authors: Jungbae Bahng, Myoung Choul Choi, Jonggi Hong, Mi-sook Won, Byoung-seob Lee

    Abstract:

    The gas cluster ion beam (GCIB) and liquid metal ion beam have been studied in the context of ion beam usage for Analytical Equipment in applications such as X-ray photoelectron spectroscopy and secondary ion mass spectroscopy (SIMS). In particular, small ion sources are used for the secondary ion generation and ion etching. To set the context to this study, the SIMS project has been launched to develop ion-gun based Analytical Equipment for the Korea Basic Science Institute. The objective of the first stage of the project is the generation of argon beams with a GCIB system [A. Kirkpatrick, Nucl. Instrum. Methods Phys. Res., Sect. B 206, 830-837 (2003)] that consists of a nozzle, skimmer, ionizer, acceleration tube, separation system, transport system, and target. The Wien filter directs the selected cluster beam to the target system by exploiting the velocity difference of the generated particles from GCIB. In this paper, we present the theoretical modeling and three-dimensional electromagnetic analysis of the Wien filter, which can separate Ar(+) 2500 clusters from Ar(+) 2400 to Ar(+) 2600 clusters with a 1-mm collimator.