Andreas Helfrich

Size characterisation of Au nanoparticles by ICP-MS coupling techniques

Andreas Helfrich, Wolfram Brüchert, Jörg Bettmer · Journal of Analytical Atomic Spectrometry · 2006 · 101 citations

Nanoparticles, Engineering, Nanocluster +18

Analysis of gold nanoparticles using ICP-MS-based hyphenated and complementary ESI-MS techniques

Andreas Helfrich, Jörg Bettmer · International Journal of Mass Spectrometry · 2011 · 66 citations · Full text

Nanoparticles, Chemical Engineering, Engineering +8

Determination of phytic acid and its degradation products by ion-pair chromatography (IPC) coupled to inductively coupled plasma-sector field-mass spectrometry (ICP-SF-MS)

Andreas Helfrich, Jörg Bettmer · Journal of Analytical Atomic Spectrometry · 2004 · 34 citations

Engineering, Ion-pair Chromatography, Biological Mass Spectrometry +20

Gel Electrophoresis Coupled to Inductively Coupled Plasma−Mass Spectrometry Using Species-Specific Isotope Dilution for Iodide and Iodate Determination in Aerosols

Wolfram Brüchert, Andreas Helfrich, Nico Zinn et al. · Analytical Chemistry · 2007 · 30 citations

Determination of phosphorylation degrees in caseins by on-line gel electrophoresis coupled to ICP-SFMS

Andreas Helfrich, Jörg Bettmer · Journal of Analytical Atomic Spectrometry · 2007 · 20 citations

Biological Mass Spectrometry, Peptide Science, Analytical Ultracentrifugation +17