Their structures were elucidated by means of a combination of homo- and heteronuclear 2D-NMR techniques (COSY, TOCSY, NOESY, ROESY, HSQC, and HMBC), and by FAB-MS. The new compounds were characterized as (3β,16α)-28-{[O-β-D-glucopyranosyl-(1→3)-O-β-D-xylopyranosyl-(1→4)-O...
1 NMR structural determination of evybactin in DMSO-d6. a, 1H. b, 13C. c, COSY. d, ROESY. e, 1H-13C HSQC. f, 1H-13C HMBC. Extended Data Fig. 2 2D NMR key correlations for evybactin structural assignment. All correlations were measured in DMSO-d6 except for the HMBC ...
Their structures were elucidated by means of a combination of homo- and heteronuclear 2D-NMR techniques (COSY, TOCSY, NOESY, ROESY, HSQC, and HMBC), and by FAB-MS. The new compounds were characterized as (3β,16α)-28-{[O-β-D-glucopyranosyl-(1→3)-O-β-D-xylopyranosyl-(1→4)-O...
4A). COSY analysis traced spin systems from the H-1” of each pentose sugar product. In the case of the reduced pentose, the spin system traced the entire five-carbon network. Coupling values, measured via 1H-NMR and using spectrum resulting from a 2D-J-resolved pulse sequence, as well ...
Twenty-six baccharane-type triterpenoid glycosides, bearing a rare baccharane skeleton, were isolated and identified by chemical derivatization, 2D NMR techniques (1H–1H COSY, HMQC, HMBC, ROESY), and rapid-resolution liquid chromatography coupled with electrospray ionization quadrupole time-of-flight ...
COSY correlations from NMR analysis were employed to identify vicinal relationships among the aromatic protons in each para-substituted phenolic ring. Coupling between H6 and H8 was also established. The trans Hα to Hβ relationship was based upon the magnitude of the vicinal coupling constant (...
Part of 1H-1H 2D-NMR COSY spectrum acquired on a 14.3Teslas spectrometer of total O-glycans isolated from gastric mucin of (c) wild-type and (d) Fut2-null mice Muc5ac mucin. (e) Extended part of the wild-type even COSY spectrum showing the chemical shifts zone of H6/H5 correlation...
Combined DEPT 1D and INEPT DQF COSY 2D Experiments in 29Si NMR Spectroscopy of Alkoxysilane Polymers. 1—New Polarization Transfer NMR Methods The polarization transfer in the DEPT experiment is analysed as a function of transfer time Δ and variable pulse angle θ for a spin system InIm′Ip′...
All engineered TV residues participate in binding to a structured loop region on CD98hc that lies adjacent to the α/β barrel structure, except for TVAla442, which was mutated to prevent the incorporation of a gly- cosylation motif (Fig. 2b). Surface complementarity at the complex interface...
salina LEGE 06099 suggests the presence of bartoloside A (1)-palmitic acid esters. b Key HMBC and COSY correlations obtained from 1D and 2D NMR analysis of bartoloside A palmitate 7a purified from S. salina LEGE 06099 cells. c Bartoloside esters found in cells from a 30-day old culture...