A Synytsya Et Al 13c Cp Mas Nmr

Four distinct spectral regions can be identified by reference to published spectra of lignin himmelsbach barton 1980.

A synytsya et al 13c cp mas nmr. Substance nh 3 2 chemical shift values in ppm from tms c c5 c4 c ch3 ph pbl4 137 6 130 7 127 7 34 1 44 5 ph me pb2i7 137 7 130 8 127 8 34 1 45 0 30 5 peaa 139 99 129 05 128 7126 45 4 39 84 43 24. The observed 13 c nmr signals give rise to a spectral resolution comparable to that of crystalline lysozyme. Modern solid state nmr techniques such as magic angle spinning mas and cross polarisation cp enable conformation study of solid materials according to our knowledge only a few papers 8 10 12 16 17 deal with nmr study of β d glucans in the solid state despite the. A peak fitting analysis in the c 6 region.

Introduction solid state 13c nmr with cross polarization and magic angle sample spinning technique cp mas schaefer and stejskal 1976. 13c cp mas nmr spectra of pectins. Have recorded the 13 c cp mas nmr spectra of a three dimensional crystal of bovine heart cyctochrome c oxidase 66 which is a membrane protein of 400 kda containing 70 detergent molecules per protein. These processes have included pulping haw et al.

1984 hemicellulose kolodziejski et al. The spectra were measured at 17 variable contact times between 5 µs and 15 ms by keeping the recycle delay 3 s the spin speed of 4 mm rotor probe 9 khz the scan times 2400. 13c chemical shifts determined from 13c cp mas nmr spectra and literature. Kim wj koo yk jung mk moon hr kim sm synytsya a yun choi hs kim ys park jk park yi.

The degree of polymerization and the degree of saponification of the pva they employed were 1700 and 99 9 respectively. The authors claim a three phase model of crystalline ordered partially ordered and fully disordered regions with corresponding peak positions in the c4 region between 92 and 80 ppm and use a peak fitting. 16 studied the pva gels by making high resolution solid state 13 c nmr experiments with the cp mas and pst mas methods. 13 c nmr analysis of coal sample.

The 13 c cp mas nmr spectra the region of pyranoid ring carbons c 2 5 87 5 60 ppm of potassium pectate 1 and pectin samples 2 10 containing various amounts of methylester and acetyl groups a. 13c cp mas nmr study of c 6h5ch2ch2nh3 2 ch3nh3 n pb 912 i n3n table 1. 1986 steam explosion taylor et al. Crystallinity values for a series of spun cellulose fibres have been determined by 13 c cp mas solid state nmr by ibbett et al.

Cp mas 13 c ss nmr spectra of coal sample were obtained by an agilent dd2 500 nmr spectrometer at a frequency of 125 77 mhz for carbon and a frequency of 500 12 mhz for proton.