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Combination of matrix solid-phase dispersion extraction and direct on-line liquid chromatography-nuclear magnetic resonance spectroscopy-tandem mass spectrometry as a new efficient approach for the rapid screening of natural products: application to the total asterosaponin fraction of the starfish Asterias rubens.
Sandvoss M, Weltring A, Preiss A, Levsen K, Wuensch G. Sandvoss M, et al. Among authors: weltring a. J Chromatogr A. 2001 May 11;917(1-2):75-86. doi: 10.1016/s0021-9673(01)00668-9. J Chromatogr A. 2001. PMID: 11403494