Fractionation and characterization of polysaccharides from abaca fibre

Sun, Run‐Cang; Fang, Junyan; Goodwin, Andy A; Lawther, J. M.; Bolton, A. J.

doi:10.1016/s0144-8617(98)00046-0

Cited by 95 publications

(53 citation statements)

References 25 publications

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“…1 • 25 Besides the presence of acetyl groups, another special feature of sugar beet pectins is that they contain ferulic acid and p-coumaric acid. The presence of such hydroxycinnamic acids has been reported in Monocotyledons, including Graminaceae such as wheat straw, 26 oil palm trunks, 27 and abaca fiber, 28 and Chenopodiacees such as spinach and sugar beet. 5 • 29 Our results showed that ferulic acid in pectin samples extracted by HCI (pH 1.5, 1 h), EDT A (pH 3.3, I h), and AO (pH 3.3, 4 h) was comparatively higher (0.59% and 0.69%) than those isolated in other procedures.…”

Section: Yield and Chemical Compositionmentioning

confidence: 92%

Extraction and Physico-Chemical Characterization of Pectins from Sugar Beet Pulp

Sun

Hughes

1998

Polym J

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ABSTRACT:Sugar beet pulb (SBP) pectins were isolated from the proteolysis hydrolysates or extracted by HCI (pH 1.5, 85°C for l-6h and pH 1.5, 4h at 40--90°C), ethylenediamine tetraacetate (EDTA, 0.2%, pH 3.3, 85°C, 1, 4h), ammonium oxalate (AO, 0.2%, pH 3.3, 4h), and sodium hexametaphosphate (SHP, 0.2%, pH 3.3, 4h). An optimal HCI extraction (pH 1.5, 85°C, 4h) yielded 16.94% pectin from the dewaxed and protein-free SBP. The HCI extracted pectin contained 84.61% galacturonic acid and low ash, 2.69%. The degree of methylation was over 60% in all the pectin samples, indicating that the sugar beet pectin is a high methoxy pectin. The degree of acetylation ranged between 10.80% and 14.78%, resulting in poor gelling capacity of the pectins. The pectins also contained 7.21 % to 10.73% neutral sugars, which were mainly arabinose and galactose. The molecular-average weights ranged between around 60000 and 90000 Da. It was found that lignin in SBP cell walls is tightly associated with pectin. Besides the esterified ferulic acid, seven other phenolic monomers, principally vanillin and p-hydroxybenzoic acid, were initially identified in the alkaline nitrobenzene oxidation of bound lignin in the isolated pectin samples.KEY WORDS Sugar Beet Pulp / Pectin / Galacturonic Acid / Sugars / Molecular Weight / Extraction / Ferulic Acid / Phenolics / Lignin / Sugar beet pulp (SBP) is a by-product of the sugar refining industry, and it is used as animal feed at relatively low price. It consists mainly of polysaccharides (approximately 70% of the dry matter), of which pectin (25%), arabinan (21 %), and cellulose (24%) prevail. It is therefore a potentially rich source. 1 • 2 The pectins of sugar beet are complex heteropolysaccharides containing galacturonic acid, rhamnose, arabinose, and galactose as the major sugar constituents. They are characterized by a backbone of ix-(l -4)-linked galacturonic acid residues, forming long smooth regions which may be interrupted by hairy regions, consisting of a 1 : 1 ratio of galacturonic acid and (l-2)-linked rhamnose residues in the backbone, and a high degree of substitution of the rhamnogalacturonan. Some rhamnose residues carry side chains, consisting mainly of (l-5)-linked a-arabinans with branches attached to position 3, (l-4)-linked /J-galactans of low polymerization degree, and highly branched (l-3,6)-linked galactans. 3 • 4 Beet pectins, however, differ from pectins isolated from apple or citrus by their high rhamnose content, 5 by the presence of acetyl groups linked to the a-o-galacturonic acid and by the presence of ferulic acid; which is associated almost exclusively with the pectic side chains and is found ester-linked to either the C-2 of arabinofurance or to the C-6 of galactopyranose residue. 6 • 7 Further studies suggest that the ferulic acid is distributed about equally between the arabinan and galactan moieties of SBP. 4 • 8 Due to the low molecular weight and the presence of acetyl groups, the pectins of SBP have poor gelling properties and low viscosity which limit its use a...

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Section: Yield and Chemical Compositionmentioning

confidence: 92%

Extraction and Physico-Chemical Characterization of Pectins from Sugar Beet Pulp

Sun

Hughes

1998

Polym J

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“…2008). The water-soluble matter, pectin, hemicellulose, and cellulose content of the kenaf fibers that were treated and untreated were determined using the method described by Sun et al (1998).…”

Section: Chemical Composition Determinationmentioning

confidence: 99%

Effect of Steam Pressure on Chemical and Structural Properties of Kenaf Fibers during Steam Explosion Process

Zhang¹,

Han²,

Jiang³

et al. 2016

BioResources

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The chemical and structural properties of kenaf fibers that were treated at different steam pressures during the steam explosion process were investigated. With increased steam pressure, a higher percentage of cellulose and acid-insoluble lignin and a lower content of hemicellulose and pectin were obtained. This result was further confirmed by Fourier transform infrared (FTIR) spectroscopy. X-ray diffraction (XRD) studies revealed that the steam-exploded kenaf fibers were more crystalline than the raw kenaf fibers, and that excessive steam pressure above 3 MPa damaged the cellulose crystalline structure. Scanning electron microscopy (SEM) analysis showed a change in the surface morphology of the treated kenaf fibers. The lower content of gums and the effective defibrillation of steam-exploded kenaf fibers demonstrated the potential of steam explosion treatment in applications of kenaf fibers.

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“…20,23 It is also shown that carbonyl groups occur abundantly with the methyl and acetyl ester groups in pectin, the acetyl ester groups in xylan, and in the oxidative products of cellulose. [24][25][26] However, the wood species used in this experiment, Chinese tallow tree (Triadica sebifera syn. Sapium sebiferum), is not rich in pectin, 12 and the most profound effects of cellulose oxidation occurred at 2508C, 26 which is far beyond the temperature used in this experiment.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

Characterization of liquefied wood residues from different liquefaction conditions

Pan

Shupe

Hse

2007

J of Applied Polymer Sci

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ABSTRACT:The amount of wood residue is used as a measurement of the extent of wood liquefaction. Characterization of the residue from wood liquefaction provides a new approach to understand some fundamental aspects of the liquefaction reaction. Residues were characterized by wet chemical analyses, Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The Klason lignin content of the residues decreased, while the holocellulose and a-cellulose contents increased as the phenol to wood ratio (P/W) increased. A peak at 1735 cm-', which was attributed to the ester carbony1 group in xylan, disappeared in the FTIR spectra of the residues from liquefied wood under a sealed reaction system, indicating significantly different effects of atmospheric versus sealed liquefaction. The crystallinity index of the residues was higher than that of the untreated wood particles and slightly increased with an increase in the P/W ratio. The SEM images of the residues showed that the fiber bundles were reduced to small-sized bundles or even single fibers as the P/W ratio increased from 1/1 to 3/1, which indicated that the lignin in the middle lamella had been dissolved prior to the cellulose during liquefaction. 63 2007 Wiley Periodicals, Inc.

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Fractionation and characterization of polysaccharides from abaca fibre

Cited by 95 publications

References 25 publications

Extraction and Physico-Chemical Characterization of Pectins from Sugar Beet Pulp

Extraction and Physico-Chemical Characterization of Pectins from Sugar Beet Pulp

Effect of Steam Pressure on Chemical and Structural Properties of Kenaf Fibers during Steam Explosion Process

Characterization of liquefied wood residues from different liquefaction conditions

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