The relationship between acetyl content and sugar composition in expanding leaves of beech (<i>Fagus sylvatica</i> L.)

Bacon, J. S. D.

doi:10.1042/bj1850405

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…Table 3) may not reach the necessary threshold value. The analysis of the constituent sugars by hydrolysis and subsequent separation of the alditol acetates derived from them is further described and discussed by Bacon (1980). Analysis of the sugar composition of light and heavy fractions from separations of unmilled cell walls on light petroleum/carbon tetrachloride den-sity gradients showed xylose as a proportion of the total neutral sugar to be higher (34%) in the light fraction than in the heavier (27%), there being a compensating difference in the proportion of glucose.…”

Section: Chemical Analyses On Fractions From Density Gradientsmentioning

confidence: 99%

Fractionation of cell-wall preparations from grass leaves by centrifuging in non-aqueous density gradients

Gordon¹,

Bacon²

1981

Biochemical Journal

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1. Dried preparations of cell walls from perennial-ryegrass (Lolium perenne) and Italian-ryegrass (L. multiflorum) leaves were suspended in mixtures of carbon tetrachloride with light-petroleum (b.p. 45--50 degrees C) or alcohols and layered on density gradients formed from the same solvents. 2. On centrifugation, the cell walls become distributed throughout a suitably chosen gradient. Fractions corresponding to various regions of the gradient were separated, examined under the microscope and analysed. 3. Cell-wall preparations made from leaf material ground in liquid N2, or in a triple roll mill, showed considerable heterogeneity in particle size, and their behaviour in the density gradient was variable, although there was a general indication that walls derived from vascular bundles were less dense than those from sclerenchyma. 4 Treatment in a vibratory ball mill decreased the size of the particles and produced a more uniform material, but made it impossible to distinguish the origins of the particles. This material behaved more reproducibly in the density gradient. 5. Some fractionations were also made by successive centrifugation in media of increasing relative density. 6. Analyses of the fractions obtained by each method indicated that the less dense had a greater proportion of xylose in the polysaccharide components, and higher contents of acetyl groups and lignin, confirming the close relationship between these components in plant cell walls. 7. The results show that there are differences in polysaccharide composition between the cell-wall types in the grass leaf, the vascular tissue being richer in hemicellulose relative to cellulose than the sclerenchyma.

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Section: Chemical Analyses On Fractions From Density Gradientsmentioning

confidence: 99%

Fractionation of cell-wall preparations from grass leaves by centrifuging in non-aqueous density gradients

Gordon¹,

Bacon²

1981

Biochemical Journal

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Influence of chemical and biological pretreatments on the degradation of lignocellulosic material by biological systems

Morrison

1988

J Sci Food Agric

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A B S T R A C TA highly lignified lignocellulosic substrate, barley straw, was modified by treatment with a variety of chemical and biological reagents. These reagents had specific effects on different components of the cell wall. The residual materials after the treatments were analysed for their composition and degradability by two biological pretreatments, rumen liquor and pepsinlcellulase. The biological pretreatments (cellulase and hemicellulase) gave residues with decreased degradability . Reagents which primarily attack the hemicellulose component gave residues with slightly increased degradabilities. When the treatments primarily hydrolysed the phenolic acidlacetic acid ester bonds, the degradabilities were also slightly increased, but only reagents which primarily attack the core lignin component of the cell wall gave residues with greatly increased degradabilities. Similar results were obtained with both biological systems, but the rumen liquor system was always more efficient than the pepsinlcellulase system.

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Comparative analytical and antioxidant activity studies on a series ofFagus sylvaticaL. leaves extracts

Pîrvu¹,

Grigore²,

Bubueanu³

et al. 2013

Journal of Planar Chromatography – Modern TLC

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The relationship between acetyl content and sugar composition in expanding leaves of beech (Fagus sylvatica L.)

Cited by 3 publications

References 15 publications

Fractionation of cell-wall preparations from grass leaves by centrifuging in non-aqueous density gradients

Fractionation of cell-wall preparations from grass leaves by centrifuging in non-aqueous density gradients

Influence of chemical and biological pretreatments on the degradation of lignocellulosic material by biological systems

Comparative analytical and antioxidant activity studies on a series ofFagus sylvaticaL. leaves extracts

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