title: Fingerprinting of yogurt products by laser desorption spray post-ionization mass spectrometry.
abstract: Yogurt and related products have been directly analyzed using laser desorption spray post-ionization mass spectrometry (LDSPI-MS) in positive ion mode. Assignments are made for some of the abundant diagnostic peaks through LDSPI-MS/MS analysis in comparison with authentic compounds. It is demonstrated that different yogurt products can be reliably differentiated according to their LDSPI-MS spectra. Principal component analysis (PCA) is further used to clearly show the capability of LDSPI-MS fingerprinting for rapid sorting of yogurt products. We believe that this sample-preparation-free technique can be a very useful product screening tool in the dairy industry because of its simplicity, reliability and high throughput.
authors.affiliation: Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
authors.forename: Jia
authors.initials: J
authors.lastname: Liu
authors.forename: Bo
authors.initials: B
authors.lastname: Qiu
authors.forename: Hai
authors.initials: H
authors.lastname: Luo