Bruker Biospin Gmbh

Karlsruher Institut Fur Technologie

Pss Polymer Standards Service Gmbh

Gisela Guthausen

Arne Kasten

Andreas Kamlowski

Markus Cudaj

Manfred Wilhelm

Thorsten Hofe

An analysis system () for the analysis of a sample, comprises a gel permeation chromatograph () that is coupled with a nuclear magnetic resonance (=NMR) spectrometer. The chromatograph () has a gel permeation chromatography (=GPC) separating column system () that is filled with porous particles (). The NMR spectrometer is configured as a low-field NMR spectrometer () with a permanent magnet system () for generating a Bfield of the NMR spectrometer. The low-field NMR spectrometer () comprises a shim system () with which homogeneity of the Bfield of at least 0.5 ppm can be achieved in a right circular cylindrical sample volume () having a diameter of at least 5 mm and a length of at least 15 mm. The system permits the quantitative and qualitative chemical analysis of samples containing substances of different molecular size using a less expensive apparatus.

Analysis system with GPC and NMR spectroscopy coupling, in particular for the analysis of samples having polymers

A description is given of a method for determining the content of a first component of a sample, which first component provides a first NMR signal and has a first self-diffusion coefficient D, the sample additionally containing at least one further component which provides a further NMR signal and has a larger self-diffusion coefficient D, in particular for determining the fat content of a hydrous sample, with the aid of a low-resolution nuclear magnetic resonance (NMR) pulse spectrometer, the sample being excited by a radio-frequency (RF) excitation pulse and being exposed to a magnetic gradient field and to a sequence of further refocusing RF pulses for generating spin echo signals, the spin echo signals being detected and their amplitude values being determined, from which a value for the content of the first component of the sample is determined. The magnetic gradient field is not switched off during the sequence of further refocusing RF pulses.

Method and apparatus for determining the fat content

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Rheinstetten, Germany

Gisela Guthausen