1H and 13C solid-state NMR of Gossypium barbadense (Pima) cotton

Taylor, Robert E.; French, Alfred D.; Gamble, Gary R.; Himmelsbach, David S.; Stipanovic, Robert D.; Thibodeaux, Devron P.; Wakelyn, Phillip J.; Dybowski, Cecil

doi:10.1016/j.molstruc.2007.08.006

Cited by 25 publications

(23 citation statements)

References 30 publications

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“…Nor are the 2D spectra consistent with models in which the Iα and Iβ crystalline forms are concentric (4,56). The results were consistent with a model in which well ordered cellulose forms the core of each microfibril and much of the less ordered cellulose is at the surface, as has been suggested previously on the basis of NMR experiments (6,15,58).…”

Section: Resultssupporting

confidence: 89%

“…Information on the spatial disposition of cell-wall polymers can be extracted from NMR experiments measuring proton spin diffusion (15,55,56). Proton magnetization gradients are first set up by allowing partial spin relaxation, which occurs at different rates in rigid and mobile domains.…”

Section: Resultsmentioning

confidence: 99%

“…The proton magnetization is then allowed to reequilibrate between domains by spin diffusion and measured through the 13 C spectrum. The length of time required for proton spin diffusion between two domains depends on the square of the distance between them (55,56).…”

Section: Resultsmentioning

confidence: 99%

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Nanostructure of cellulose microfibrils in spruce wood

Fernandes

Thomas

Altaner

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

635

693

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The structure of cellulose microfibrils in wood is not known in detail, despite the abundance of cellulose in woody biomass and its importance for biology, energy, and engineering. The structure of the microfibrils of spruce wood cellulose was investigated using a range of spectroscopic methods coupled to small-angle neutron and wide-angle X-ray scattering. The scattering data were consistent with 24-chain microfibrils and favored a "rectangular" model with both hydrophobic and hydrophilic surfaces exposed. Disorder in chain packing and hydrogen bonding was shown to increase outwards from the microfibril center. The extent of disorder blurred the distinction between the I alpha and I beta allomorphs. Chains at the surface were distinct in conformation, with high levels of conformational disorder at C-6, less intramolecular hydrogen bonding and more outward-directed hydrogen bonding. Axial disorder could be explained in terms of twisting of the microfibrils, with implications for their biosynthesis.crystallinity | infrared | deuterium exchange | nuclear magnetic resonance | spin diffusion

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

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Nanostructure of cellulose microfibrils in spruce wood

Fernandes

Thomas

Altaner

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

635

693

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“…The region in the chemical shift interval 60-90 ppm is indicative of the presence of carbohydrates with the largest contribution due to celluloses and hemicelluloses (Schmidt et al, 2000;Lemma et al, 2007;Taylor et al, 2008). In particular, the shoulders at 68 and 84 ppm can be due to carbon 6 and 4 respectively, while the signal at 72 ppm is usually assigned to carbons in positions 2, 3 and 5 in cellobiose units.…”

Section: Cpmas 13c Nmr Spectramentioning

confidence: 99%

Adsorption of dissolved organic matter on clay minerals as assessed by infra-red, CPMAS 13C NMR spectroscopy and low field T1 NMR relaxometry

Conte

Abbate

Baglieri

et al. 2011

Organic Geochemistry

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This is an author version of the contribution published on:Questa è la versione dell 'autore dell'opera: Organic Geochemistry 42 (2011) 972-977 2011,http://dx.doi.org/10.1016/j.orggeochem.2011 ABSTRACTDissolved organic matter (DOM) is a very important environmental constituent due to its role in controlling factors for soil formation, mineral weathering and pollutant transport in the environment. Prediction of DOM physical-chemical properties is achieved by studying its chemical structure and spatial conformation. In the present study, dissolved organic matter extracted from compost obtained from the organic fraction of urban wastes (DOM-P) has been analysed by FT-IR, CPMAS 13C NMR spectroscopy and 1H T1 NMR relaxometry with fast field cycling (FFC) setup. While the first two spectroscopic techniques revealed the chemical changes of dissolved organic matter after adsorption either on kaolinite (DOMK) or montmorillonite (DOM-S), the latter permitted the evaluation of the conformational variations as assessed by longitudinal relaxation time (T1) distribution at the fixed magnetic field of 500 mT. Alterations of T1 distributions from DOM-P to DOM-K and DOM-S were attributed to a decreasing molecular complexity following DOM-P adsorption on the clay minerals. This study applied for the first time solid state 1H T1 NMR relaxometry to dissolved organic matter from compost obtained from the organic fraction of urban wastes and revealed that this technique is very promising for studying environmentally relevant natural organic systems.

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“…The interaction of water with cellulose and its influence on the nuclear spin dynamics in Gossypium barbadense (Pima) cotton were investigated by 1H and 13C solid-state NMR techniques. 1H spin diffusion results from a Goldman-Shen experiment indicate that the water is multilayered (105).…”

Section: Molecular and Supramolecular Physicalmentioning

confidence: 99%

Cotton

Wakelyn¹,

Condon²,

Thibodeaux³

2010

Encyclopedia of Polymer Science and Technology

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Cotton is both a fiber and a food crop that is grown in about 130 countries in the world. About 60 countries cultivate at least 5000 ha and use about 2.5% of the world's total arable land area. In 2009/2010 in the world, about 103 million 217.7‐kg (480‐lb) bales [∼22.4 million metric tons (24.7 million tons)] of cotton fiber and 32.4 million metric tons (35.8 million tons) of cottonseed were produced. Cotton is the most important natural fiber (about 35% of the textile fiber consumed in the world in 2008) used to produce apparel, home furnishings, and industrial products. Cottonseed is one of the world's important oilseeds, used for vegetable oil, animal feed, and linters. About 95% of the world's cotton production is derived from varieties of upland cotton ( Gossypium hirsutum ) and about 5% is extra long staple cotton (“ELS”; G. barbadense ). In 2010 biotech varieties make up more than 60% of the cotton grown in the world. Commercial cottons are white. There has been some interest in organic cotton (∼0.6% of world production) and naturally colored cottons (shades of brown and green are the main colors; only a trace is produced). The demand for more “sustainable” / “ecofriendly” cotton and cotton textiles continues to increase. The origin, biosynthesis, biology, development, production, harvesting, ginning, classification, physical properties, textile processing, morphology, physical structure, chemistry, reactivity, economic aspects, utilization, and health and safety are reviewed.

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1H and 13C solid-state NMR of Gossypium barbadense (Pima) cotton

Cited by 25 publications

References 30 publications

Nanostructure of cellulose microfibrils in spruce wood

Nanostructure of cellulose microfibrils in spruce wood

Adsorption of dissolved organic matter on clay minerals as assessed by infra-red, CPMAS 13C NMR spectroscopy and low field T1 NMR relaxometry

Cotton

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