Extractive components responsible for the discoloration of Ilomba wood (Pycnanthus angolensis Exell)

Yazaki, Y.; Bauch, J.; Endeward, R.

doi:10.1007/bf02607902

Cited by 20 publications

(11 citation statements)

References 6 publications

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“…Work by McDonald et al (1997) showed that chromophores in milled radiata pine wood lignin (310 nm) were similar to chromophores in heated hot water extracts from radiata pine. In addition, the presence of tannins in the waterinsoluble fractions of extract A3 may also contribute to KBS since catechin, epi-catechin, and ellagitannins have been associated with discolorations in other wood species (Yazaki et al 1985;Charrier et al 1995). In addition, the presence of tannins in the waterinsoluble fractions of extract A3 may also contribute to KBS since catechin, epi-catechin, and ellagitannins have been associated with discolorations in other wood species (Yazaki et al 1985;Charrier et al 1995).…”

Section: Discussionmentioning

confidence: 99%

The Chemical Nature of Kiln Brown Stain in Radiata Pine

McDonald¹,

Fernández²,

Kreber³

et al. 2000

Holzforschung

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This paper presents results of a study on the chemical nature of kiln brown stain (KBS) that develops in kiln dried radiata pine (Pinus radiata D. Don) sapwood. KBS is a chocolate brown discolouration which develops approximately 0.5 mm under the timber surface. Stain free radiata pine was achieved during drying trials on "green" radiata pine sapwood which had been treated to extensive cold and hot water extraction. Differences in chemical composition between the sap and hot water extract were observed. Chemical analyses (of the water-soluble extracts) by a combination of chromatographic and spectroscopic techniques, demonstrated that carbohydrates, cyclitols, amino acids, protein, and phenolics were the main compound classes present. The presence of reducing sugars (glucose and fructose) and amino acids (glutamic acid) in the sap and hot water extracts support the theory that Amadori-Maillard type reactions significantly contribute to the formation of colour in KBS. Furthermore, lignin was also detected and is suspected to contribute to KBS formation. The relative contributions of colour formation to KBS intensity from either phenolics or Maillard-Amadori mechanisms is unknown. KeywordsAmino acids Kiln brown stain Kiln drying Maillard reaction Radiata pine Reducing sugars Sap Brought to you by |

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Section: Discussionmentioning

confidence: 99%

The Chemical Nature of Kiln Brown Stain in Radiata Pine

McDonald¹,

Fernández²,

Kreber³

et al. 2000

Holzforschung

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“…The reddish-brown discoloration in the heart of white birch (B. papyrifera) is due to oxidation products of phenolic extractives (Siegle, 1967). Furthermore, catechin isomers have been shown to play a role in the discoloration of Ilomba wood (Yazaki et al, 1985) and western hemlock (Tsuga heterophylla) (Hrutfi ord et al, 1985).…”

Section: Role Of Phenolic Compoundsmentioning

confidence: 97%

“…Korean pine has been replanted extensively during the past several decades, but pine sapwood is usually highly susceptible to dark discoloration caused by sap staining fungi. Ilomba wood (Pycnanthus angolensis) has been attributed to reactions of phenolic extractives caused by microorganisms or enzymes (Yazaki et al, 1985;Hon and Minemura, 1991). Chen and Workman (1980) and Kubinsky and Ifju (1973) studied the effect of steaming on the color of press-extracted wood fluids, concluding that extractives in wood fl uids are largely wood pigments.…”

Section: Microorganismsmentioning

confidence: 99%

Causes of color changes in wood during drying

et al. 2010

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The forest industry operates in a dynamic and global market where change and competition are the rule rather than the exception. The color of wood is one of the most attractive features for the modern wood industry. Even when wood is chosen for its structural qualities, attractive and decorative colors are usually an important factor. In many applications, particularly in furniture, decorative products, decorative veneers and fl ooring, accurate matching of the color of different samples is required. Wood attributes and properties are important because they have a direct bearing on market opportunities and consumer acceptance for many types of manufactured wood products. The aim of this review is to identify causes of wood discoloration and advances in drying technology to overcome this problem. Wood discoloration is a complex phenomenon, mainly affected by heat, light, physiological and biochemical reactions, as well as from attack by microorganisms.

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“…Zimmermann (1974) pense aussi que la coloration brune observee chez l'erable (Acer pseudoplatanus) proviendrait de Toxydation biologique des leucoanthocyanidines. De meme, Yazaki et al (1985) precisent que les composes phenoliques responsables de la coloration brune du bois tropical Homba (Pycnanthus angolensis Exell) seraient constitues par des leucoanthocyanidines et des proanthocyanidines.…”

Section: Discussionunclassified

Chimie de la Couleur du Bois. Etude Comparative des Constituants Polyphénoliques dans le Chêne Sain et le Chêne Coloré

Haluk¹,

Schloegel²,

Metche³

1991

Holzforschung

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ResumeLa «discoloration» du ebene constitue un phdnomöne indesirable qui entraine une diminution considerable de la qualite" du bois. Les mocanismes d'oxydation impliquos dans la «discoloration» et encore mal connus fönt intervenir des substances polyph£noliques plus particulierement les gallotanins et les ellagitanins dans le cas du ebene. Nous avons procedc ä une Serie d'extractions et de fractionnements sur gel simultanoment ä partir de la sciure de ebene sain (CS) et de ebene colore (CC), provcnant de placages industriels ayant subi le traitement du sechage. Les techniques chromatographiques et les analyses chimiques ont pcrmis de mettre en e"vidence des differences qualitatives et quantitatives au niveau des substances polyphinoliques des fractions de CS et de CC. La sciure de ebene colore contient des polymeres polyphe"noliques colores et des esters plus complexes, les hcxahydroxydiphe'noylesters, en quantito beaucoup plus importante que dans la sciure de ebene sain. L'acide gallique est vraisemblablement implique dans la coloration brune obtenue que resulterait de rdactions de couplage oxydatif entre unites galloylees des structures galloylglucose.

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Extractive components responsible for the discoloration of Ilomba wood (Pycnanthus angolensis Exell)

Cited by 20 publications

References 6 publications

The Chemical Nature of Kiln Brown Stain in Radiata Pine

The Chemical Nature of Kiln Brown Stain in Radiata Pine

Causes of color changes in wood during drying

Chimie de la Couleur du Bois. Etude Comparative des Constituants Polyphénoliques dans le Chêne Sain et le Chêne Coloré

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