富山県林業技術センター 研究報告 No.9 p.78-83 (1995)
カラマツ鋸屑に異樹種の鋸屑が混入すると，カラマツアラビノガラクタンの収率や品質およ
び精製効率に影響を及ぼす可能性がある。
そこで，混入の可能性があるシベアリ産エゾマツ，オウシュウアカマツ，北米産ベイマツの各鋸屑の冷水抽出物量およびその成分組成を測定し，シベリア産カラマツのそれと対比考察した。その結果は，以下のようにまとめられる。
1）異樹種鋸屑から得られる冷水抽出物は，1．1〜2．2％であり，カラマツのそれのほぼ1／5以下であった。また，冷水抽出物中に含まれる糖質量は，28．4〜53．0％であり，カラマツの85．6％に比べて少なかった。
2）冷水抽出物中に含まれる着色性全フェノール量は，エゾマツおよびベイマツに多く，20％前後を示した。この量はカラマツの約12および15倍に相当する。
3）異樹種鋸屑の冷水抽出物に含まれる糖質は，木材ヘミセルロース構成糖の6種類のすべてによって構成された。その重量平均分子量は，約100万のポリマーから180のモノマーまで広範囲の分布を示した。このことは，アラビノガラクタン単一成分からなるカラマツとは異なり，異樹種のそれは数種の糖の混合系であることを示唆している。
4）カラマツ鋸屑に異樹種鋸屑がそれぞれ20％混入した場合，アラビノガラクタンの収率は，全量がカラマツ鋸屑の場合の8．7％から約6．5％に低下すると予測された。また，脱色負荷となる着色性全フェノール量は，1．2〜3．2倍に増加すると予測された。
Production of Larch Arabinogalactan III.
Comparision of Cold Water Extracts from Larch Sawdust and Different
Kinds of Conifers
Katsuo MIZUMOTO*，Rihei TAKAHASHI** and Ryoichi TAKANO*
Summary
When the sawdust of different kinds of conifers was mixed with
larch sawdust, there is the possibility that it has an influence
on the refining efficiency and the quality of products as well
as the yield of larch arabinogalactan.
Therefore, regarding the sawdust of different kinds of trees which
are feared to be mixed, that is, Spruce, Scotch pine grown in
Siberia, and Douglas fir grown in North America, the content of
the cold water extracts, and the chemical composition in these
extracts was measured, and examined by comparing them with those
of larch grown in Siberia. The results are summarized as follows.
1) The cold water extracts obtained from the sawdust of different
kinds of trees, Spruce, Scotch pine and Douglas fir, were as little
as 1.1-2.2% when compared with 10.1% for larch sawdust. In addition,
the total sugar content contained in the extracts of the sawdust
of these different kinds of trees was 28.4-53.0%, and it was very
little compared with 85.8% for larch.
2) The total phenol content of the coloring impurities contained
in the cold water extracts was especially large in the case of
Spruce and Douglas fir, being about 20%. This amount is equivalent
to about 12 and 15 times of that for larch.
3) The saccharide in the cold water extracts obtained from the
sawdust of the different kinds of trees consisted of all six kinds
of the composition sugar of wood hemicellulose, and their weight-averaged
molecular weight distributed over a wide range from polymers of
about one million to monomers of 180. This fact is different from
the saccharide of larch, which consists of one component, and
it is suggested that these of different kinds of trees are a mixture
of several kinds of polysaccharide.
4) When the sawdust of respective different kinds of trees was
mixed by 20% in larch sawdust, it is forecasted that the yield
of arabinogalactan decreases to about 6.5% from 8.7% when the
whole amount is larch sawdust. Moreover, it is forecasted that
the amount of phenol of the coloring impurities which became the
decoloring load, the time for refining increased to 1.2-3.2 times
similarly.