【摘要】 <正> 在测定植物纤维原料的木素含量时,我国一直沿用测Klason木素的方法。众所周知,Klason木素含量与原料或浆料中的真正木素含量有一定的差异,因此目前在国外测定木材原料或纸浆中的木素含量时,普遍使用测总木素含量(K1ason木素更多还原

【Abstract】 A method for acid-soluble lignin determination of bagasse has been investigated. Acid-soluble lignin in Klason lignin filtrate was extracted by chloroform, and then isolated readily from furfural and 5-hydroxy-methylfurfural by using petroleum ether. Gas chromatography was a useful apparatus for detecting furfural and 5-hydroxymethylfurfural. It was shown that acid-soluble lignin of bagasse should be determined at 202 nm and its absorptivity is 105 I/g·cm. At 202 nm, the absorption of carbohydrate degradation products must not be overlooked.更多还原