title: Combined use of COSY and double quantum two-dimensional NMR spectroscopy for elucidation of spin systems in polymyxin B.
abstract: Two-dimensional single quantum correlation NMR spectroscopy (COSY) and two-dimensional double quantum NMR spectroscopy (2QT) are used to study spin systems in the 1H NMR spectrum of polymyxin B. Because of different frequency relationships, the two types of two-dimensional NMR experiments are found to be highly complementary. This is demonstrated by combined use of COSY and 2QT spectroscopy to obtain a complete analysis of the complicated spectral overlap which occurs in the 1H NMR spectrum of polymyxin B.
mesh_terms: D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008433:Mathematics; D011112:Polymyxin B; D011113:Polymyxins
chemical_list: D011113:Polymyxins; D011112:Polymyxin B