Carbohydrates in Rubberwood<i>(Hevea brasiliensis</i>Muell.)

Kadir, Azizol Abdul; Sudin, Rahim

doi:10.1515/hfsg.1989.43.3.173

Cited by 13 publications

(6 citation statements)

References 3 publications

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“…Previous studies about the chemical properties of untreated rubber wood can help explain this behavior. According to Kadir and Sudin [ 26 ] this species presents high fructose, glucose, sucrose, maltose and starch contents in cellular lumen. However, these compounds are relatively low at the central part of the stem (regions where occurs the juvenile wood) and great in the periphery (regions where occurs the mature wood).…”

Section: Resultsmentioning

confidence: 99%

Changes in the Chemical Composition and Decay Resistance of Thermally-Modified Hevea brasiliensis Wood

et al. 2016

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In this study the effect of thermal treatment on the equilibrium moisture content, chemical composition and biological resistance to decay fungi of juvenile and mature Hevea brasiliensis wood (rubber wood) was evaluated. Samples were taken from a 53-year-old rubber wood plantation located in Tabapuã, Sao Paulo, Brazil. The samples were thermally-modified at 180°C, 200°C and 220°C. Results indicate that the thermal modification caused: (1) a significant increase in the extractive content and proportional increase in the lignin content at 220°C; (2) a significant decrease in the equilibrium moisture content, holocelluloses, arabinose, galactose and xylose content, but no change in glucose content; and (3) a significant increase in wood decay resistance against both Pycnoporus sanguineus (L.) Murrill and Gloeophyllum trabeum (Pers.) Murrill decay fungi. The greatest decay resistance was achieved from treatment at 220°C which resulted in a change in wood decay resistance class from moderately resistant to resistant. Finally, this study also demonstrated that the influence of thermal treatment in mature wood was lower than in juvenile wood.

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Section: Resultsmentioning

confidence: 99%

Changes in the Chemical Composition and Decay Resistance of Thermally-Modified Hevea brasiliensis Wood

et al. 2016

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“…For freshly cut rubberwood, the total amount of free sugars, starch and amino acids is estimated as c. 5-10% (Simatupang & Schmitt 1994) with values c. 9% for starch and c. 2% for free sugars (Kadir & Sudin 1989). For aspen wood, the amount of starch is c. 2.4% and the amount of free sugars 1.5% (Witt & Sauter 1994).…”

Section: Discussionmentioning

confidence: 99%

Degradation of the Gelatinous Layer in Aspen and Rubberwood by the Blue Stain Fungus Lasiodiplodia Theobromae

Encinas¹,

Daniel²

1997

IAWA J

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Studies on the degradative ability of the blue stain fungus Lasiodiplodia theobromae (Pat.) Griffon ' Maublanc have shown several strains to cause significant weight losses (c. 20%) in wood of temperate and tropical species, aspen (Populus tremula) and rubberwood (Hevea brasiliensis), both species that commonly form tension wood. In addition to the consumption of soluble carbohydrates, major changes occurred in the ultrastructure of fibre cell walls, with a rapid attack of the G-layer of the gelatinous fibres. Following G-layer degradation, earlywood fibres of both species showed true cell wall degradation with pronounced erosion attack, suggesting that prior destruction of the G-layer afforded greater accessibility and ease of attack of the outer secondary cell wall layers.

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“…Previous studies about the chemical properties of untreated rubber wood can help explain this behavior in dimensional stability showed in our study. According to Kadir & Sudin (1989), this species contains high fructose, glucose, sucrose, maltose, and starch contents in cellular lumen. However, these compounds are relatively low at the central part of the stem (regions where the juvenile wood occurs) and are greater in the periphery (regions where the mature wood occurs).…”

Section: -7mentioning

confidence: 99%

“…Moreover, juvenile wood is characterized by high lignin content when compared with mature wood and consequently presents an adverse effect on thermal modification (Calonego et al, 2014;Calonego et al, 2016;Severo et al, 2012). H. brasiliensis presents opposite behavior (Severo et al, 2016) due to sugar content in the cell lumen of mature wood (Kadir & Sudin, 1989).…”

Section: Introduction and Objectivesmentioning

confidence: 99%

Physical Properties of Thermally Modified Juvenile and Mature Wood of Hevea brasiliensis (Euphorbiaceae)

et al. 2020

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Exposing timber to temperatures approaching 200 °C causes thermal modification and changes its characteristics. This study evaluates the effect of various levels of thermal treatment on the physical properties of juvenile and mature wood from rubber tree (Hevea brasiliensis). Boards taken from 53-year-old rubber trees were thermally modified at up to 220 °C. Thermal treatment caused decreases on the oven-dried density, equilibrium moisture content, and swellings on juvenile and mature woods of H. brasiliensis. Influence of thermal modification at 180-200 °C in juvenile wood was lower than in mature wood, whereas the treatment at 220 °C caused a greater variation in properties of juvenile wood. The thermally modified wood is a suitable product for use in environments with high levels of relative humidity.

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Carbohydrates in Rubberwood(Hevea brasiliensisMuell.)

Cited by 13 publications

References 3 publications

Changes in the Chemical Composition and Decay Resistance of Thermally-Modified Hevea brasiliensis Wood

Changes in the Chemical Composition and Decay Resistance of Thermally-Modified Hevea brasiliensis Wood

Degradation of the Gelatinous Layer in Aspen and Rubberwood by the Blue Stain Fungus Lasiodiplodia Theobromae

Physical Properties of Thermally Modified Juvenile and Mature Wood of Hevea brasiliensis (Euphorbiaceae)

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