Wenxin (Shirley) Xu
Bruker BioSpin GmbH, China
Dr. Wenxin (Shirley) Xu joined Bruker Biospin in Shanghai, China in March 2011 as NMR application scientist. She is responsible for the pre- and post-sale technology support for Bruker NMR instrument. From 2000 to 2005, she did her Bachelor degree in clinical medicine at Wuhan University. From 2005 to 2010 she did her Doctor’s degree in analytical chemistry in Wuhan institute of physics and mathematics, Chinese academy of science.
Full-automated high resolution 1H-NMR spectroscopy offers unique screening capabilities for food quality and safety by combining non-targeted and targeted screening in one analysis (15 - 20 minutes from acquisition to report). Full-automated high resolution 1H-NMR (400 MHz) has found its way into the quality control of food and beverages over the last years. The advantage of full-automated high resolution 1H-NMR is its absolute reproducibility and transferability for laboratory to laboratory, which is not equaled by other methods currently used in food analysis. NMR reproducibility allows statistical investigations e.g. for detection of variety, mixing of varieties, geographical origin and adulterations, where smallest changes of many ingredients at the same time must be recorded. Reproducibility and transferability of the solutions shown are user-, instrument- and laboratory-independent. Sample preparation, measurement and processing are based on strict standard operation procedures which are substantial for this fully automated solution. The non-targeted approach to the data allows detecting even unknown deviations, if they are visible in the 1H-NMR spectra of e.g. fruit juice, wine, edible oils or honey. The same data acquired in high throughput mode are also subjected to quantification of multiple compounds. The fully automated 1H-NMR methodology will shortly be introduced and then results on fruit juices, wine and edible oils will be presented and the advantages of the fully automated 1H-NMR solutions shown. The method has been proven on fruit juices and wine, where so far unknown frauds could be detected. In addition conventional targeted parameters are obtained in the same analysis. This technology has additionally the advantage that NMR is completely quantitative and concentration calibration only has to be done once for all compounds.