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- W2356576704 abstract "Peak overlap is one of the major factors complicating the analysis of NMR spectra. For glucosamine compounds,such as N-acetyl-D-glucosamine and D-glu-cosamine hydrochloride,anomerization occurs readily and leads to a mixture of α and β anomers in aqueous solution. As a result,peaks overlap seriously in1 H NMR spectra. A selective excitation NMR technique,one dimensional total correlation spectroscopy( 1D TOCSY) offers a robust approach to resolving seriously overlapped spectra. In 1D TOCSY experiment,one of anomeric protons in glucosamines( for compound 383: δH5. 39,4. 89; for compound 170: δH5. 13,4. 64) was selectively excited,and the corresponding signal was transferred to protons within the same spin system in a stepwise process with an increased mixing time( 10-200 ms) of the shaped pulse( Gaussian pulse). Through a series of these proton-relay spectra,the peaks and conformations of each anomer were assigned. As a set of suitable spectra including13 C NMR,DEPT135,HSQC and HMBC were obtained,the structural elucidation of these anomeric components were achieved. A rapid NMR method for the structure assignment of α and β anomers mixture of glucosamines was established." @default.
- W2356576704 created "2016-06-24" @default.
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- W2356576704 date "2015-01-01" @default.
- W2356576704 modified "2023-09-27" @default.
- W2356576704 title "1D TOCSY Technique for Sequential Structure Assignment of Glucosamines in Aqueous Solution" @default.
- W2356576704 hasPublicationYear "2015" @default.
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