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

聚戊醣分析法流程圖—間苯二甲酚光度法。

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

聚戊醣分析法流程图—间苯二甲酚光度法.

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

至于同为化学主要组成分的质素、全素、聚戊醣等成分，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的白桦，可以降低灰分、抽出物、素含量，提高素和聚戊含量。