Journal
JOURNAL OF WOOD SCIENCE
Volume 47, Issue 1, Pages 69-72Publisher
SPRINGER-VERLAG TOKYO
DOI: 10.1007/BF00776648
Keywords
acid-soluble lignin; Klason lignin; sulfuric acid lignin; hardwood
Categories
Ask authors/readers for more resources
To elucidate the formation mechanism of acid-soluble lignin (ASL) formed in the Klason lignin determination, beech wood meals were treated with sulfuric acid (SA) under various conditions, and the ASL solution was extracted with CHCl3. The results indicated the following: (1) wood components yielding ASL are dissolved in 72% SA during the initial stage: (2) the quantity of ASL is highest during the initial stage, then decreases with prolonged time of 72% SA treatment and finally reaches a constant value; (3) soluble lignin prepared by 72% SA treatment and subsequent standing in 3% SA again yield insoluble Klason lignin and ASL after boiling in 3% SAI and (4) about half the amount of ASL is dissolved in CHCl3. The foregoing suggest that wood components yielding ASL are dissolved in 72% SA at the beginning and finally change to ASL after being subjected to depolymerization, hydrolysis, and other reactions. ASL may thus be composed of low-molecular-weight degradation products and hydrophilic derivatives of lignin.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available