Efficiency of purging sequences in the long-range heteronuclear shift correlation experiment |
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| Institution: | 1. Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, UK;1. Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China;2. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China;1. First clinical medical college, Guangxi Medical University, Nanning 530021, China;2. Pharmaceutical College, Guangxi Medical University, Nanning 530021, China;3. Guangxi Key Laboratory of Bioactive Molecules Research and Evaluation, Nanning 530021, China;4. Guangxi Beibu Gulf Marine Biomedicine Precision Development and High-value Utilization Engineering Research Center, Nanning 530021, China;5. Guangxi Health Commission Key Laboratory of Basic Research on Antigeriatric Drugs, Nanning 530021, China |
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| Abstract: | The efficiencies of a number of pulse sequences designed to remove directly bonded C-H correlations from long-range C-H shift correlation maps are evaluated. A two-step J filter sequence is shown to give good suppression in 1 D experiments. Its incorporation into the long-range C-H shift correlation experiment with a BIRD sequence at the center of the refocusing period gives the BIRDTRAP sequence, which is shown to yield 2D maps with a few very weak direct correlations and no artifacts. BIRDTRAP has a sensitivity higher than that of FLOCK. |
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