Comparative study of water-soluble and alkali-soluble hemicelluloses from perennial ryegrass leaves (Lolium peree)

Xu, Feng; Sun, Jifeng; Geng, Z. C.; Liu, Chuanfu; Ren, Junli; Sun, Run‐Cang; Fowler, Paul A.; Baird, Mark S.

doi:10.1016/j.carbpol.2006.04.014

Cited by 87 publications

(56 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The previous result indicated that this run probably contained β-glucan, starch, arabinogalactan, highly substituted arabinoxylans, and the pectic polysaccharides. Similar results have been found in the previous studies on the low molecular weight, highly substituted polysaccharides obtained by extraction with distilled water from wheat straw, and rye leaves (Lawther et al 1995;Xu et al 2007). As shown in Table 2, the monosaccharide of the alkali-organic and alkali-soluble hemicelluloses (H 2 -H 6 ) were mainly composed of xylose, arabinose, glucuronic acid, and glucose, which suggested that substantial proportions of the hemicelluloses in the cell walls of sweet sorghum probably consisted of glucuronoarabinoxylans and β-(1→3)(1→4)-glucans, which need to be further confirmed by FT-IR and NMR spectra.…”

Section: Yield and Sugar Composition Of Hemicellulosessupporting

confidence: 79%

Fractional Separation and Structural Features of Hemicelluloses From Sweet Sorghum Leaves

Peng¹,

Bian²,

Peng³

et al. 2012

BioResources

View full text Add to dashboard Cite

Six hemicellulosic samples were isolated from cell wall material of dewaxed sweet sorghum (Sorghum bicolor (L.) Moench) leaves by sequential extractions with distilled water, alkali, and organic alkali solvent. The samples were treated with water, 1% NaOH, and 60% ethanol. The organic alkali samples were treated with 1%, 3%, 5%, and 8% NaOH, which yielded 8.3%, 5.4%, 1.0%, 5.6%, 2.5%, and 4.9% hemicelluloses based on the dry initial sweet sorghum leaves, respectively, and resulted in a total release of 81% of all hemicelluloses originally present in the cell wall. The results indicated that water-soluble hemicelluloses contained noticeable amounts of glucose, arabinose, galactose, and xylose, and had a relatively lower molecular weight (17300 g/mol). The four alkali-soluble hemicellulosic fractions, rich in xylose, were more linear, and had higher molecular weights (48500-128000 g/mol) than those of the alkali organic-soluble hemicellulosic fraction. With an increase of NaOH concentration from 1% to 8%, the ratio of arabinose to xylose decreased from 0.29 to 0.01, which implied that the hemicelluloses obtained by the higher concentration of alkali appeared to be more linear. Based on the sugar analysis, Fourier transform infrared (FT-IR), and nuclear magnetic resonance (NMR) results, 4-O-methylglucuronoarabinoxylans were the major constituents of the hemicellulosic polymers.

show abstract

Section: Yield and Sugar Composition Of Hemicellulosessupporting

confidence: 79%

Fractional Separation and Structural Features of Hemicelluloses From Sweet Sorghum Leaves

Peng¹,

Bian²,

Peng³

et al. 2012

BioResources

View full text Add to dashboard Cite

show abstract

“…Higher xylose content means lower residual mass (see Tables 3, 4), which is related to the linear structure of xylose and its thermal instability. According to Xu et al (2007), degradation of hemicelluloses occurs at low temperatures (220-315°C) because they are amorphous and have random structure. Thus, lignin with a low percentage of xylose could be considered purer and, consequently, presents more difficulty to be thermally degraded, which means a great residual mass.…”

Section: Composition Of the Black Liquorsmentioning

confidence: 99%

Composition and structure of organosolv lignins from four eucalypt species

et al. 2014

View full text Add to dashboard Cite

Lignins were extracted from different species using organosolv process (ethanol/water). Obtained organosolv lignins were characterised by various methods to determine their composition, structure and functional groups with the purpose of evaluating their potential use for obtaining value-added compounds. The purity of organosolv lignins was determined. The total phenols content and the antioxidant power were analysed in order to know the reactivity of lignins. The ratio S/G was determined by nitrobenzene oxidation. In addition, molecular weight distribution, infrared spectroscopy and thermo gravimetrical analysis were carried out in order to determine the physical and chemical properties of organosolv lignins. Obtained organosolv lignins have very high purity and low sugar and inorganic contamination. All organosolv lignins samples have high polydispersity, and lignin from grey ironbark wood had the highest molecular weight average. Among the organosolv lignins, lemon-scented gum showed the highest average value of S/G ratio and the lowest average value of total phenols.

show abstract

“…In the plant cell walls, hemicelluloses are associated with cellulose and lignin by hydrogen bonds and covalent bonds (mainly ether and ester linkages), respectively. Therefore, isolation of hemicelluloses in a pure form from plant cell walls involves hydrolysis of ester and ether linkages followed by extraction of them into aqueous media (Xu et al 2007). It has been recently observed in tomato tissue that hemicellulose polymers are present at cell junctions, imparting a role in cell adhesion (Ordaz-Ortiz et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Soluble Polysaccharides Isolation and Characterization from Rabbiteye Blueberry (Vaccinium ashei) Fruits

Deng

Shi

et al. 2012

BioResources

View full text Add to dashboard Cite

Five soluble polysaccharide fractions were sequentially extracted with water, EDTA, Na 2 CO 3 , 4% KOH, and 14% KOH solutions at room temperature for 4 h from cell wall material of rabbiteye blueberry (Vaccinium ashei) fruits, and their physicochemical properties were examined. The sequential treatments yielded a total 36.02% soluble polysaccharides of the dry cell wall material. HPAEC and spectroscopy (FT-IR, NMR) analyses indicated that water-, EDTA-, and Na 2 CO 3 -soluble polysaccharide fractions were mainly composed of pectins, followed by lower amounts of arabinogalactans and glucans, while the two KOH-soluble fractions were mainly composed of hemicelluloses. Homogalacturonan was proven to be the predominant component in the isolated blueberry fruit pectic substance. The isolated blueberry fruit hemicelluloses could be defined as a linear β-(1→4)-linked-xylopyranosyl, in which xylose was the predominant neutral sugar (69.98 to 77.16%), followed by lower amounts of galactose, glucose, arabinose, and mannose. Keywords INTRODUCTIONBlueberry (Vaccinium ashei) fruits are known for their health-promoting substances and are thus gaining wide popularity with the public (Lila 2004;. Like other berry fruits, blueberry fruits are rich sources of bioactive compounds with antimicrobial activities against human pathogens (Puupponen-Pimiä et al. 2001, 2005. These bioactive compounds include flavonoids, such as flavonols (Häkkinen and Törrönen 2000), anthocyanins, and others , all having antioxidant activity. It has been shown that dietary supplementation with blueberry fruit extracts may decrease the enhanced vulnerability to oxidative stress that accompanies aging (Joseph et al. 2005). Joseph reported that treatments with extracts from blueberries reduced oxidative stress and age-related declines in normal function in vitro and in vivo (Joseph et al. 1998). In recent decades, consumer consciousness of food nutritional value has increased and this awareness has increased the popularity of blueberries.Pectins are an important family of heterogeneous polysaccharides in fruit cell walls (Bansal et al. 2011). The major pectic polysaccharide is homogalacturonan (HG), a linear homopolymer consisting of α-(1→4)-bound galacturonic acid (GalA) residues. The carboxyl moieties of the polymer are esterified to a certain degree with methanol at C-6 (Voragen et al. 2009). The degree and pattern of the methoxylation are important parameters for pectin functionality (Willats et al. 2006). Next to HG, two types of (Lv et al. 2010). In the plant cell walls, hemicelluloses are associated with cellulose and lignin by hydrogen bonds and covalent bonds (mainly ether and ester linkages), respectively. Therefore, isolation of hemicelluloses in a pure form from plant cell walls involves hydrolysis of ester and ether linkages followed by extraction of them into aqueous media (Xu et al. 2007). It has been recently observed in tomato tissue that hemicellulose polymers are present at cell junctions, imparting a role in cell adhesion (Ordaz-Ortiz ...

show abstract

Comparative study of water-soluble and alkali-soluble hemicelluloses from perennial ryegrass leaves (Lolium peree)

Cited by 87 publications

References 31 publications

Fractional Separation and Structural Features of Hemicelluloses From Sweet Sorghum Leaves

Fractional Separation and Structural Features of Hemicelluloses From Sweet Sorghum Leaves

Composition and structure of organosolv lignins from four eucalypt species

Soluble Polysaccharides Isolation and Characterization from Rabbiteye Blueberry (Vaccinium ashei) Fruits

Contact Info

Product

Resources

About