Title: | Chemical characteristics of surface colour of birch veneer (Betula pendula) |
Author(s): | Yamamoto, Akio |
Date: | 2015 |
Language: | en |
Pages: | 62 + app. 60 |
Department: | Puunjalostustekniikan laitos Department of Forest Products Technology |
ISBN: | 978-952-60-6508-3 (electronic) 978-952-60-6507-6 (printed) |
Series: | Aalto University publication series DOCTORAL DISSERTATIONS, 182/2015 |
ISSN: | 1799-4942 (electronic) 1799-4934 (printed) 1799-4934 (ISSN-L) |
Bibid: | 721490 | Availability info (Aalto-Finna) |
Supervising professor(s): | Vuorinen, Tapani, Prof., Aalto University, Department of Forest Products Technology, Finland |
Thesis advisor(s): | Kontturi, Eero, Prof., Aalto University, Department of Forest Products Technology, Finland |
Subject: | Paper technology |
Keywords: | Silver birch, Plywood, Veneer, Proanthocyanidins, Soaking, Colour change |
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Abstract:This thesis investigates the discoloration of veneer produced from silver birch (Betula pendula) logs by means of biochemical and chemical analyses on the veneer and sap obtained from wood which was soaked at varying temperatures (20-70 ˚C). Drastic colour development was confirmed from the sap squeezed from green birch wood. The results from biochemical tests on the sap by sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE) showed the presence of polyphenol oxidases (PPO) which might form quinonoid intermediates in sap. Further chemical analysis by gas chromatography coupled with mass spectrometry revealed that the major phenol, which acts as a substrate for PPO, was epicatechin (EC). Control of the discoloration by either sodium sulphite (Na2SO3), or ethylenediaminetetraacetic acid (EDTA) was demonstrated.
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Description:Julkaistu vain painettuna, saatavuus katso Bibid. Published only in printed form, availability see Bibid
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Parts:[Publication 1]: Yamamoto A, Rohumaa A, Kontturi E, Hughes M, Saranpää P, Andberg M, Vuorinen T (2013). Colorimetric behaviour and seasonal characteristic of xylem sap obtained by mechanical compression from silver birch (betula pendula). ACS Sustainable Chemistry & Engineering 1:1075-1082. DOI: 10.1021/sc400090a View at Publisher [Publication 2]: Yamamoto A, Rohumaa A, Kontturi E, Hughes M, Vuorinen T (2015). Chemical characteristics of squeezable sap of hydrothermally treated silver birch logs (Betula pendula): effect of treatment time and the quality of the soaking water in pilot scale experiment. Wood Science and Technology 49:289-302. DOI:10.1007/s00226-014-0693-5 View at Publisher [Publication 3]: Yamamoto A, Rohumaa A, Kontturi E, Hughes M, Vuorinen T (2015). The chemical characteristics of squeezable sap from silver birch (Betula pendula) logs hydrothermally treated at 70 °C. The effect of treatment time on the concentration of water extracts. Wood Science and Technology. DOI: 10.1007/s00226-015-0758-0 View at Publisher [Publication 4]: Yamamoto A, Rohumaa A, Kontturi E, Hughes M, Vuorinen T (2015). The effect of hydrothermal treatment on the colour stability and chemical properties of birch veneer surfaces. BioResources. DOI: 10.15376/biores.10.4.6610-6623 View at Publisher |
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