Induced discoloration of buerger maple during drying process

Gao, Jianmin; Bi-guang, Zhang; Chang, Jianmin

doi:10.1007/s11632-004-0020-6

Cited by 6 publications

(6 citation statements)

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“…Color changes of hornbeam and maple during hot-air drying (60 • C) and high-temperature drying 120 • C are shown in Figure 5. A similar result was evident in [19], where a red coloration of maple wood was discovered when it was exposed to high temperatures.…”

Section: Resultssupporting

confidence: 74%

“…Color changes were more noticeable in sapwood than in red heartwood, and measurements corroborated this observation In [12], where the combination of hot-air drying and high-temperature drying of birch timber was used, the color change of wood during the high-temperature drying of birch timber could be effectively reduced using hot-air drying during the early phase of the drying process. Drying conditions and methods can affect the intensity of color change [13], but so can conditions during the cutting process, such as cutting forces [14,15] sawdust granularity [16,17], and physical properties [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Drying Temperature on Color Change of Hornbeam and Maple Wood Used as Surface and Inner Layers of Wood Composites

et al. 2021

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The thermal treatment of wood changes its structure due to the degradation of wood polymers (cellulose, hemicellulose and lignin), so the physical properties of wood are either improved or degraded. Color changes apply not only to natural wood, but also to such wood composites for which some amount of glue is used in their construction (e.g., plywood, blockboard or laminboard). This article is focused on the analysis of hornbeam and field maple wood color changes influenced by drying temperature. Two types of drying modes were used: hot-air mode where the temperature of the drying environment was 60 °C, and high-temperature mode with a drying temperature of 120 °C. The drying mode was divided into two phases depending on the moisture content of the wood. The compared woods had similar values of color coordinates at the beginning of drying. During hot-air drying, the largest changes in color coordinates occurred during the first 24 h. The total color difference between the color at the end and the beginning of drying was 7.3 for hornbeam and 11.1 for maple. The overall color difference between the compared woods was minimal. During high-temperature drying (120 °C), the color changes of the dried woods were more pronounced. In the case of maple wood, there was a very significant change in color and the value of ΔE* was twice as high as for hornbeam. The total color difference between the color at the end and at the beginning of drying was 8.7 for hornbeam and 18.9 for maple.

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Section: Resultssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

The Influence of Drying Temperature on Color Change of Hornbeam and Maple Wood Used as Surface and Inner Layers of Wood Composites

et al. 2021

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“…During drying this material tends to become red and fuscous (Gao et al, 2004). The authors suggest that high temperature and humidity accelerate the oxidation reaction of polyphenol, leuco-fancy pigment and tannin, which changes the color to red; the hydroxyl (-OH) is oxidized and the carbonyl (-C=O), carboxyl (-COOH), esters and ketone groups discolor Buerger maple.…”

Section: Causes Of Wood Discoloration 41 Heatmentioning

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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“…Numerous studies have shown that color changes of seed coats are the result of polyphenol oxidase enzymes, which oxidize their phenolic substrates to brown compounds (Karadeniz et al, 2000;Chazarra et al, 2001). For example, in Acer buergerianum, higher humidity treatment accelerated polyphenol oxidation of wood during the drying process (Gao et al, 2004). Therefore, the higher RH treatments (T20-HH and T30-HH) might accelerate the oxidation reaction of polyphenol compounds in T. grandis nuts.…”

Section: Discussionmentioning

confidence: 99%

Effect of Temperature and Humidity on Oil Quality of Harvested Torreya grandis cv. Merrillii Nuts During the After-Ripening Stage

Zhang

Jin²,

Suo

et al. 2020

Front. Plant Sci.

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Temperature and relative humidity (RH) influence post-harvest ripening, a crucial stage for quality promotion in some oil plants or fruits. Torreya grandis cv. Merrillii nuts, which are rich in unsaturated fatty acids (UFA), are easily affected by temperature and humidity, and they oxidize quickly during the post-harvest ripening stage, leading to the deterioration of nut quality. In this study, the main nutraceutical components, fatty acid composition, and related metabolic parameters of lipid rancidity under four treatments (20 • C and 70% RH, T20-LH; 30 • C and 70% RH, T30-LH; 20 • C and 90% RH, T20-HH; 30 • C and 90% RH, T30-HH) were measured. The post-harvest ripening process was advanced under HH treatments (T20-HH and T30-HH) compared to LH treatments (T20-LH and T30-LH) and was associated with a shorter time for the seed coat to turn dark black and a faster reduction in starch content. The amount of unsaturated fatty acids significantly increased under the T20-HH treatment, but significantly decreased under the T30-HH treatment from 12 to 16 d of ripening time. The acid value (AV) and lipase activity under the T30-HH treatment remained virtually constant from 12 to 16 d of ripening time, and this was accompanied by a dramatic increase in peroxide value (POV), lipoxygenase (LOX) activity, and relative expression of the LOX2 gene. Meanwhile, a significant positive correlation between LOX activity and POV, malondialdehyde (MDA) content, and O 2 • − content was observed. The results imply that the lower amount of oxidative rancidity induced by the T20-HH treatment is related to the LOX activity induced by down-regulation of the LOX2 gene during the late after-ripening stage. Therefore, the T20-HH treatment not only promoted the postharvest process of T. grandis 'Merrillii' nuts but also delayed lipid oxidation, which was ultimately associated with better oil quality at the late after-ripening stage.

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Induced discoloration of buerger maple during drying process

Cited by 6 publications

References 1 publication

The Influence of Drying Temperature on Color Change of Hornbeam and Maple Wood Used as Surface and Inner Layers of Wood Composites

The Influence of Drying Temperature on Color Change of Hornbeam and Maple Wood Used as Surface and Inner Layers of Wood Composites

Causes of color changes in wood during drying

Effect of Temperature and Humidity on Oil Quality of Harvested Torreya grandis cv. Merrillii Nuts During the After-Ripening Stage

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