Gradient BIRDR: a method to select uncoupled magnetization.
The gradient-BIRD-method is an effective way to select 13C-bound protons. By changing the phase of the proton pi-pulse, the same sequence can be used to select protons attached to 12C atoms, i.e., for filtering out the 13C-bound protons. These filters, consisting of single or double gradient-BIRDR clusters (BIRD inversion for remote protons) have considerable filtering bandwidth. Because of the efficient suppression of the coupled magnetization, we implemented the gradient-BIRDR filter in HMBC to replace the conventional low-pass filter.
Institute of Biotechnology, University of Helsinki, FIN-00014, Finland.
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Heikkinen
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Kilpeläinen
D002247:Carbon Isotopes; D005947:Glucose / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008280:Magnetics; D008962:Models, Theoretical; D011522:Protons
D002247:Carbon Isotopes; D011522:Protons; D005947:Glucose