13C magnetic resonance and structural studies on the mannose-containing polysaccharides of some Pichia and Hansenula spp.

1972 ◽  
Vol 18 (11) ◽  
pp. 1709-1715 ◽  
Author(s):  
P. A. J. Gorin ◽  
J. F. T. Spencer
Keyword(s):  
Magnetic Resonance ◽  
Cell Walls ◽  
Proton Magnetic Resonance ◽  
Structural Type ◽  
Structural Studies ◽  
Structural Investigations ◽  
Magnetic Resonance Spectra

Mannose-containing polysaccharides were isolated from the cell walls of six Pichia and Hansenula species. These species were chosen from a group of 24 yeasts having polysaccharides with a similar spectrum, each giving proton magnetic resonance spectra with signals at τ4.24 and τ4.36. The polysaccharides were equated or distinguished by their 13C magnetic resonance (c.m.r.) spectra into three groups based on differing structures. The validity of this technique was borne out by conventional structural determinations. The polysaccharides were found to represent a new structural type, being predominantly linear and containing predominant (1 → 6)-linked α-D-mannopyranose units with (1 → 2)-linked units distributed regularly along the main chains.Some of the signals of the Hansenula capsulata mannan could be assigned to certain carbons indicating that the c.m.r. technique may have uses in structural investigations.

Mass spectra and proton magnetic resonance spectra of some tetrahydroprotoberberine alkaloids

1968 ◽  
Vol 46 (15) ◽  
pp. 2501-2506 ◽  
Author(s):  
C.-Y. Chen ◽  
D. B. MacLean
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Mass Spectra ◽  
Structural Studies ◽  
New Members ◽  
Magnetic Resonance Spectra

The mass spectra and the proton magnetic resonance spectra of tetrahydroprotoberberine alkaloids, oxygenated at the 9- and 10-positions, show marked differences from the spectra of those oxygenated at the 10- and 11-positions. These differences may be useful in structural studies on new members of this group of alkaloids.

Structures of yeast mnnans containing both α- and β-linked D-mannopyranose units

1969 ◽  
Vol 47 (9) ◽  
pp. 1499-1505 ◽  
Author(s):  
P. A. J. Gorin ◽  
J. F. T. Spencer ◽  
S. S. Bhattacharjee
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Main Chain ◽  
Specific Rotation ◽  
Substantial Proportion ◽  
Side Chains ◽  
Structural Investigations ◽  
Magnetic Resonance Spectra

Several mannans from yeasts give proton magnetic resonance spectra with distinctive H-1 signals at higher field than τ 4.55. A number of these mannans were investigated polarimetrically and each has a specific rotation corresponding to a mixture of α- and β-D-linkages. Four were partially hydrolyzed and shown to have most of the α-linkages in the main chains and the β-linkages in the side chains. Detailed structural investigations showed that the Pichiapastoris mannan probably has an α-(1→6)-D-manno-pyranosyl main-chain substituted in the 2-positions with a substantial proportion of O-α-D-mannopy-ranosyl-(1→2)-O-β-D-mannopyranosyl-(1→2)-O-β-D-mannopyranosyl-(1→2)-O-α-mannopyranosyl side-chains (1). The related mannan from Citeromycesmatritensis has a similar main-chain, which is substituted in the 2-positions by α-D-mannopyranosyl units and β-(1→2)-pyranose-linked D-mannotriosyl and perhaps mannobiosyl side-chains (2).

The preparation of 2-Fluoro-5-nitrobenzonitrile and the proton magnetic resonance spectra of some compounds containing the N-(2-Cyano-4-nitrophenyl) group

1967 ◽  
Vol 20 (8) ◽  
pp. 1663 ◽  
Author(s):  
JFK Wilshire
Keyword(s):  
Amino Acids ◽  
Magnetic Resonance ◽  
Nitro Group ◽  
Proton Magnetic Resonance ◽  
Cyano Group ◽  
Aromatic Nucleus ◽  
Heteroaromatic Compounds ◽  
Magnetic Resonance Spectra

2-Fluoro-5-nitrobenzonitrile, an analogue of 1-fluoro-2,4- dinitrobenzene, in which the 2-nitro group has been replaced by a cyano group, has been prepared and made to react with several amines, amino acids, and NH-heteroaromatic compounds. The proton magnetic resonance spectra of some of the resultant N-(2-cyano-4-nitrophenyl) derivatives were compared with the spectra of the corresponding N-(2,4- dinitrophenyl) derivatives and furnish further evidence that the ortho nitro group of the latter derivatives is rotated out of the plane of the aromatic nucleus.

scholarly journals Proton Magnetic Resonance Spectra of Porcine and Bovine Insulin and of the A and B Chain of Bovine Insulin

1967 ◽  
Vol 242 (11) ◽  
pp. 2637-2645
Author(s):  
Børge Bak ◽  
Erik Jonas Pedersen ◽  
F. Sundby
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Bovine Insulin ◽  
Magnetic Resonance Spectra

Investigation and Identification of the Bromination Products of Dimethoxyamphetamines

1976 ◽  
Vol 59 (5) ◽  
pp. 1162-1169
Author(s):  
Keith Bailey ◽  
Denise R Gagné ◽  
Richard K Pike
Keyword(s):  
Magnetic Resonance ◽  
Qualitative Analysis ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Infrared Spectra ◽  
Proton Magnetic Resonance ◽  
Positive Identification ◽  
Aromatic Bromination ◽  
Layer Chromatography ◽  
Magnetic Resonance Spectra

Abstract The qualitative analysis of the aromatic bromination products of the 6 isomeric dimethoxyamphetamines and their hydrochloride or hydrobromide salts is described. Their ultraviolet, mass, and proton magnetic resonance spectra are not sufficiently different for distinction but infrared spectra allow a positive identification to be made and reference spectra are provided for the bromination products of 2,4-, 2,5-, 2,6-, 4,5-, and 3,5-dimethoxyamphetamines. The application of gas-liquid and thin layer chromatography for the analysis of these products is discussed. The bromination of 2,3-dimethoxyamphetamine consistently gave mixtures which could not be separated satisfactorily; spectra are included for completeness of the comparison of products.

Metal complexing properties and proton magnetic resonance spectra of 5-halo-8-quinolinols

1969 ◽  
Vol 41 (8) ◽  
pp. 1003-1008 ◽  
Author(s):  
R. G. Beimer ◽  
Quintus. Fernando
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Complexing Properties ◽  
Magnetic Resonance Spectra
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