• Title/Summary/Keyword: Betula maximowicziana

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Extractives from the Sapwood of Betula maximowicziana (큰잎자작(Betula maximowicziana) 변재의 추출성분)

  • Lee, Hak-Ju;Kato, Atsushi
    • Journal of the Korean Wood Science and Technology
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    • v.31 no.2
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    • pp.45-51
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    • 2003
  • One flavonoid, lignan glycosides and two diarylheptanoids were isolated from the sapwood of Betula maximowicziana. The structures were determined as : catechin 7-O-𝛽-D-xylopyranoside, lyoniresinol 9'-O-𝛽-D-glucopyranoside, 11-oxo-3, 8, 12, 17-tetrahydroxy-9-ene[7, 0]-metacyclophane and 11-oxo-3, 8, 9, 10, 12, 17-hexahydroxy[7, 0]-metacyclophane, respectively, on the basis of spectrosopic data and chemical correlations.

Ultraviolet Microscopic Study on Lignin Distribution in the Fiber Cell Wall of BCTMP

  • Yoon, Seung-Lak;Yasuo Kojina
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.36 no.1
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    • pp.61-66
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    • 2004
  • Bleached chemithermomechanical pulp (BCTMP) was produced from CTMP of Betula maximowicziana Regel by two staged ozone-hydrogen peroxide bleaching in order to improve the optical properties of high yield pulp. This pulp was used for the evaluation of optical properties improvement, chemical characteristics of lignin in fiber and the relationship between lignin and optical properties in fiber cell wall. Hydrogen peroxide treatment improved the brightness, but the post color number (PC No.). There was little improvement on optical properties by ozone treatment, but this could be improved more by using two staged ozone-hydrogen peroxide bleaching. The hydrogen peroxide treatment did not make any change on chemical characteristics of lignin in cell wall, but by ozone treatment, it was found that the non-aromatic conjugated structure was existed in the surface of cell wall, but this could be removed by hydrogen peroxide treatment in two staged ozone-hydrogen peroxide treatment. Therefore, the optical properties was significantly improved, due to the removal of non-aromatic conjugated structure.

ULTRAVIOLET MICROSCOPIC STUDY ON LIGNIN DISTRIBUTION IN THE FIBER CELL WALL OF BCTMP

  • Seung-Lak YooN;Yasuo KOJIMA;Lee, Seon-Ho
    • Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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    • 1999.04b
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    • pp.375-380
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    • 1999
  • In order to improve the optical properties of high yield pulp, bleached chemi-thermo-mechanical pulp (BCTMP) was produced from CTMP of Betula maximowicziana Regel by two staged ozone-hydrogen peroxide bleaching. This pulp was used for the evaluation of the improvement of optical properties, chemical characteristics of lignin in fiber, and the relationship between lignin and optical properties in fiber cell wall. By hydrogen peroxide treatment, the brightness was improved, but the post color number (PC No.) was not. There was little improvement on optical properties by ozone treatment, but his could be solved by using two staged ozone-hydrogen peroxide bleaching. The hydrogen peroxide treatment did not make nay change on chemical characteristics of lignin in cell wall, but by ozone treatment, it was found that the non-aromatic conjugated structure was existed in the surface of cell wall, but this could be removed by hydrogen peroxide treatment in two staged ozone-hydrogen peroxide treatment. Therefore, the optical properties was significantly improved due to the removal of non-aromatic conjugated structure.