@article{12940,
  abstract     = {Desorption electrospray ionization (DESI), easy ambient sonic-spray ionization (EASI) and low-temperature plasma (LTP) ionization are powerful ambient ionization techniques for mass spectrometry. However, every single method has its limitation in terms of polarity and molecular weight of analyte molecules. After the miniaturization of every possible component of the different ion sources, we finally were able to embed two emitters and an ion transfer tubing into a small, hand-held device. The pen-like interface is connected to the mass spectrometer and a separate control unit via a bundle of flexible tubing and cables. The novel device allows the user to ionize an extended range of chemicals by simple switching between DESI, voltage-free EASI, or LTP ionization as well as to freely move the interface over a surface of interest. A mini camera, which is mounted on the tip of the pen, magnifies the desorption area and enables a simple positioning of the pen. The interface was successfully tested using different types of chemicals, pharmaceuticals, and real life samples. Moreover, the combination of optical data from the camera module and chemical data obtained by mass analysis facilitates a novel type of imaging mass spectrometry, which we name “interactive mass spectrometry imaging (IMSI)”.},
  author       = {Meisenbichler, Christina and Kluibenschedl, Florian and Müller, Thomas},
  issn         = {0003-2700},
  journal      = {Analytical Chemistry},
  keywords     = {Analytical Chemistry},
  number       = {21},
  pages        = {14314--14318},
  publisher    = {American Chemical Society},
  title        = {{A 3-in-1 hand-held ambient mass spectrometry interface for identification and 2D localization of chemicals on surfaces}},
  doi          = {10.1021/acs.analchem.0c02615},
  volume       = {92},
  year         = {2020},
}

@article{13383,
  abstract     = {Two novel donor–acceptor Stenhouse adducts (DASAs) featuring the catechol moiety were synthesized and characterized. Both compounds bind strongly to the surfaces of magnetite nanoparticles. An adrenaline-derived DASA renders the particles insoluble in all common solvents, likely because of poor solvation of the zwitterionic isomer generated on the nanoparticle surfaces. Well-soluble nanoparticles were successfully obtained using dopamine-derived DASA equipped with a long alkyl chain. Upon its attachment to nanoparticles, this DASA undergoes an irreversible decoloration reaction owing to the formation of the zwitterionic form. The reaction follows first-order kinetics and proceeds more rapidly on large nanoparticles. Interestingly, decoloration can be suppressed in the presence of free DASA molecules in solution or at high nanoparticle concentrations.},
  author       = {Ahrens, Johannes and Bian, Tong and Vexler, Tom and Klajn, Rafal},
  issn         = {2367-0932},
  journal      = {ChemPhotoChem},
  keywords     = {Organic Chemistry, Physical and Theoretical Chemistry, Analytical Chemistry},
  number       = {5},
  pages        = {230--236},
  publisher    = {Wiley},
  title        = {{Irreversible bleaching of donor-acceptor stenhouse adducts on the surfaces of magnetite nanoparticles}},
  doi          = {10.1002/cptc.201700009},
  volume       = {1},
  year         = {2017},
}