Martin Krappe

Online coupling of pressurized liquid extraction, solid-phase extraction and high-performance liquid chromatography for automated analysis of proanthocyanidins in malt

Menelaos Papagiannopoulos, Benno F. Zimmermann, Annett Mellenthin et al. · Journal of Chromatography A · 2002 · 73 citations

Pharmacy, Food Science, Chromatographic Analysis +16

Supercritical fluid extraction of polycyclic aromatic hydrocarbons (PAH) from native soil and fly ash with pure and modified carbon dioxide and dimethylether

Bernd Wenclawiak, Thomas Paschke, Martin Krappe · Fresenius Journal of Analytical Chemistry · 1997 · 18 citations

Engineering, Chemical Engineering, Environmental Engineering +14

In situ transesterification of the natural pyrethrins to methyl esters by heterogeneous catalysis using a supercritical fluid extraction system and detection by gas chromatography-mass spectrometry

Bernd Wenclawiak, Martin Krappe, A. Otterbach · Journal of Chromatography A · 1997 · 13 citations

Natural Sciences, Chemical Engineering, Chemistry +17

Heterogenic catalytic hydrolysis and analysis of natural pyrethrins in subcritical water coupled with solid phase microextraction (SPME) and GC-MS

Martin Krappe, Steven B. Hawthorne, Bernd Wenclawiak · Fresenius Journal of Analytical Chemistry · 1999 · 12 citations

Natural Sciences, Chemical Engineering, Chemistry +12

Capillary supercritical fluid chromatography of pyrethrins and pyrethroids with positive pressure and negative temperature gradients

Bernd Wenclawiak, A. Otterbach, Martin Krappe · Journal of Chromatography A · 1998 · 11 citations

Pharmacy, Chemistry, Pharmaceutical Analysis +12