The results showed that the lignin in the unbleached pulp was mainly composed of syringyl lignin (S-lignin) and guaiacyl lignin (G-lignin).
结果表明未漂浆中主要存在紫丁香基木素和愈疮木基木素，漂白过程中缩合的愈疮木基木素溶出相对较少。
2
The spectrum showed that BSL was composed mainly of syringl (S), guaiacyl(G) and p-hydroxylphengl (H) units, and the ratio of three uncondensed group (S:G:H)was 2.
The results showed that during the chemical pretreatment the guaiacyl unit was more readily to be sulfonated and dissolved, and there were new conjugated carbonyl and quinoid structure formed.