Solid-state 13C and 1H spin diffusion NMR analyses of the microfibril structure for bacterial cellulose

Solid State Nuclear Magnetic Resonance
Kenji MasudaFumitaka Horii

Abstract

To obtain further information about the cause for the rather large splitting of the C4 resonance line into the downfield (C4D) and upfield (C4U) lines in CP/MAS 13C NMR spectra for native cellulose, 13C and 1H spin diffusion measurements have been conducted by using different types of bacterial cellulose samples. In 13C spin diffusion measurements, the C4D resonance line is selectively inverted by the Dante pi pulse sequence and the 13C spin diffusion is allowed to proceed from the C4D carbons to other carbons including the C4U carbons with use of the 13C4-enriched bacterial cellulose sample. The analysis based on the simple spin diffusion theory for the process experimentally observed reveals that the C4U carbons may be located at distances less than about 1 nm from the C4D carbons. In 1H spin diffusion measurements, poly(vinyl alcohol) (PVA) films in which ribbon assemblies of bacterial cellulose are dispersed are employed and the 1H spin diffusion process is examined from the water-swollen PVA continuous phase to the dispersed ribbon assemblies by the 13C detection through the 1H-13C CP technique. As a result, it is found that the C4D and C4U carbons are almost equally subjected to the 1H spin diffusion from the PVA phase, i...Continue Reading

References

Jun 1, 1992·International Journal of Biological Macromolecules·J F RevolD G Gray
Jul 21, 2000·Solid State Nuclear Magnetic Resonance·R H Newman
Jan 20, 1984·Science·R H Atalla, D L Vanderhart

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Citations

Nov 24, 2012·Plant Physiology·Lynne H ThomasMichael C Jarvis
Sep 4, 2012·Carbohydrate Polymers·Tetsuya MoriJun Kikuchi
Mar 5, 2014·Current Opinion in Biotechnology·Marcus Foston
Jun 29, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Ganesh GuhadosJeffrey L Hutter
Feb 3, 2012·Journal of Agricultural and Food Chemistry·Marcus FostonArthur J Ragauskas

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