Andreas Helfrich

Size characterisation of Au nanoparticles by ICP-MS coupling techniques

Andreas Helfrich, Wolfram Brüchert, Jörg Bettmer · Journal of Analytical Atomic Spectrometry · 2006 · 102 citations

Natural Sciences, Chemistry, Materials Science +17

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

Andreas Helfrich, Jörg Bettmer · International Journal of Mass Spectrometry · 2011 · 67 citations · Full text

Natural Sciences, Chemistry, Materials Science +11

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

Natural Sciences, Chemistry, Food Science +17

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

Natural Sciences, Chemistry, Analytical Chemistry +16

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

Life Sciences, Biochemistry, Mass Spectrometric Analysis +15