NMR studies of structure and dynamics in fruit cuticle polyesters

Yan, Bing; Ray, Anup K.; Chen, Z; Fang, Xiuhua; Garbow, Joel R.

doi:10.1016/s0926-2040(00)00052-7

Cited by 41 publications

(32 citation statements)

References 20 publications

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“…[28] In addition, samples swollen in DMSO-d 6 have enhanced molecular mobility and when combined with MAS (that minimises the effects of chemical shift anisotropy, dipoledipole interactions and magnetic susceptibility line broadening), less mobile soil components become visible. [55][56][57][58][59] Swelling in DMSO-d 6 was also shown to disrupt soil aggregates and provide information on hydrophobic structures that are physically protected by the arrangement of the OM under aqueous conditions. [60] Our results for soil and humin samples swollen in DMSO-d 6 are consistent with a study that showed aromatic moieties in soil are protected within hydrophobic regions that are not accessible by water.…”

Section: Nmr Characterisation Of Whole Soils and Isolated Huminmentioning

confidence: 99%

Analysis of soil organic matter at the solid–water interface by nuclear magnetic resonance spectroscopy

Genest

Simpson

et al. 2014

Environ. Chem.

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Environmental context. Structural and conformational information on organic matter-clay complexes and whole soils was obtained using different NMR methods. The results show that organic matter interactions with clay mineral surfaces determine the accessibility of specific organic matter components at the soil-water interface. This physical conformation may also play a role in soil biogeochemical processes and binding to pollutants in terrestrial environments.Abstract. Organic matter (OM)-mineral interactions play an important role in OM preservation, global carbon cycling and contaminant transport. Studies have indicated that preferential sorption of OM is dependent on mineral type and solution conditions. In this study, 1 H high resolution-magic angle spinning nuclear magnetic resonance (HR-MAS NMR) spectroscopy was employed to examine OM chemistry in organo-clay complexes. Dissolved OM from a forest soil, Leonardite humic acid and Peat humic acid were sorbed to Ca 2þ enriched kaolinite and montmorillonite. As observed using 1 H HR-MAS NMR spectroscopy, kaolinite sorbed mainly long-chain aliphatic compounds such as those from plant cuticles whereas montmorillonite sorbed a mixture of aliphatic components and proteins. These results show the preferential sorption of specific dissolved OM components on clay surfaces. This was tested further using solid-state 13 C and 1 H HR-MAS NMR analysis of whole soils containing kaolinite and montmorillonite as well as a Peat soil for contrast. The species present at the soil-water interface were mainly aliphatic components, carbohydrates and amino acids. Aromatic constituents were present in the soils (observed by solid-state 13 C NMR and by 1 H HR-MAS NMR spectroscopy when a more penetrating solvent was used) which signifies that these compounds likely exist in more hydrophobic domains that are buried and surface inaccessible. This study highlights the important role of OM interactions with clay minerals in the preservation of OM in soils and suggests that OM-OM associations may also play a role in the protection of specific OM components in soil.

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Section: Nmr Characterisation Of Whole Soils and Isolated Huminmentioning

confidence: 99%

Analysis of soil organic matter at the solid–water interface by nuclear magnetic resonance spectroscopy

Genest

Simpson

et al. 2014

Environ. Chem.

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“…By means of AFM, we study the role of such hydroxyl groups in defining a layer growing pattern on the surface of mica and how the conclusions can be extended to the understanding of the genesis and short-range structure of biopolymer cutin. [12][13][14] …”

Section: Introductionmentioning

confidence: 99%

The Role of Hydroxyl Groups in the Self-Assembly of Long Chain Alkylhydroxyl Carboxylic Acids on Mica

et al. 2008

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The adsorption and self-assembly of hydroxylated long chain fatty acids on mica has been studied by AFM. The presence of secondary midchain hydroxyl groups is found to strongly affect the self-assembly process via the reinforcement of lateral interactions between molecules by -OH · · · HO-hydrogen bonding. On the other side, the availability of an exposed terminal hydroxyl group in the acid molecule triggers the formation of a second layer due to the strength of the -OH · · · HOOC-tail-to-head interaction. Surface coverage (θ) data follow a Langmuir-type relationship vs solution concentration (c). The analysis of the slope of 1/θ vs 1/c plots provides a relative estimation of the adsorption enthalpy for the formation of the first and second monolayers. Based on that, both the contribution of molecule-substrate and lateral molecule-molecule energy terms are found to be relevant in the self-assembly of this type of molecule on mica.

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“…For example, detailed through-bond connectivities and assignments of structures in cuticle and algenan, two insoluble plant biopolymers, were generated by HR-MAS NMR (Fang et al, 2001;Deshmukh et al, 2003;Simpson et al, 2003). The quantitative nature of the HR-MAS NMR technique was also confirmed when it was found that the molecular mobility of a swelled cutin sample facilitated reliable quantitative analysis (Stark et al, 2000). HR-MAS NMR analysis has also been successfully applied to study the structural basis for the anti-oxidative behavior of plant extracts (Scheidt et al, 2004) and the quality of agricultural produce (Brescia et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Assessing the fate and transformation of plant residues in the terrestrial environment using HR-MAS NMR spectroscopy

Kelleher

Simpson

2006

Geochimica et Cosmochimica Acta

102

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NMR studies of structure and dynamics in fruit cuticle polyesters

Cited by 41 publications

References 20 publications

Analysis of soil organic matter at the solid–water interface by nuclear magnetic resonance spectroscopy

Analysis of soil organic matter at the solid–water interface by nuclear magnetic resonance spectroscopy

The Role of Hydroxyl Groups in the Self-Assembly of Long Chain Alkylhydroxyl Carboxylic Acids on Mica

Assessing the fate and transformation of plant residues in the terrestrial environment using HR-MAS NMR spectroscopy

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