Andreas Helfrich

Size characterisation of Au nanoparticles by ICP-MS coupling techniques

J. Bettmer, Andreas Helfrich, Wolfram Brüchert, 2006 .

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

J. Bettmer, Andreas Helfrich, 2007 .

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)

J. Bettmer, Andreas Helfrich, 2004 .

Do polymorphic compounds make good cocrystallizing agents? A structural case study that demonstrates the importance of synthon flexibility

A. Beatty, C. Aakeröy, Andreas Helfrich, 2003 .

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

J. Bettmer, Andreas Helfrich, 2011 .

Gel electrophoresis coupled to inductively coupled plasma-mass spectrometry using species-specific isotope dilution for iodide and iodate determination in aerosols.

N. Zinn, T. Hoffmann, J. Bettmer, 2007, Analytical chemistry.