Fig. 4 Flow chart of pentosan analysis - Orcinol spectrophotometric method.

聚戊醣析法图—间苯二甲酚光度法.

Fig. 4 Flow chart of pentosan analysis – Orcinol spectrophotometric method.

聚戊醣析法圖—間苯二甲酚光度法。

In different harvesting seasons, the lignin, holocellulose and pentosan contents in bamboos didn''t change too much.

于同为化学主要组成质素、全纤维素、聚戊醣等成，则没有季节变化。

That means the birch from high longitude and latitude areas will have lower content of the ash, extraction and lignin, higher content of the holocellulose and pentosan in the wood.

这表明，选择较高经纬度地区白桦，可以降低灰、抽出物、素含量，提高综纤维素和聚戊糖含量。