Skip to main content

Official Journal of the Japan Wood Research Society

Journal of Wood Science Cover Image

Formation and chemical structures of acid-soluble lignin I: sulfuric acid treatment time and acid-soluble lignin content of hardwood

Abstract

To elucidate the formation mechanism of acidsoluble 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 CHC13. 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% SA; and (4) about half the amount of ASL is dissolved in CHC13. 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.

References

  1. 1.

    Yasuda S, Terashima N. Ito T (1981) Chemical structures of sulfuric acid lignin IV. Reaction of arylglycerol-Β-aryl ether with seventy-two percent sulfuric acid. Mokuzai Gakkaishi 27:879–884

    CAS  Google Scholar 

  2. 2.

    Yasuda S, Ota K (1987) Chemical structures of sulfuric acid lignin. X. Reaction of syringylglycerol-Β-syringyl ether and condensation of syringyl nucleus with guaiacyl lignin model compounds in sulfuric acid. Holzforschung 41:59–65

    CAS  Article  Google Scholar 

  3. 3.

    Yasuda S, Terashima N (1982) Chemical structures of sulfuric acid lignin. V. Reaction of three arylglycerol-Β-aryl ether [α-, /gb-, and γ-13C] with seventy-two percent sulfuric acid. Mokuzai Gakkaishi 28:383–387

    CAS  Google Scholar 

  4. 4.

    Musha Y, Goring DAI (1974) Klason and acid-soluble lignin content of hardwoods. Wood Sci 7:133–134

    CAS  Google Scholar 

  5. 5.

    Schoning AG, Johanson G (1965) Absorptiometric determination of acid-soluble lignin in semichemical bisulfite pulps and in some woods and plants. Svensk Papperstidn 68:607–613

    CAS  Google Scholar 

  6. 6.

    Swan B (1965) Isolation of acid-soluble lignin from the Klason lignin determination. Svensk Papperstidn 68:791–795

    CAS  Google Scholar 

  7. 7.

    Yasuda S, Hirano J (1990) Chemical structures of sulfuric acid lignin. XI. Physical and chemical properties of beech sulfuric acid lignin. Mokuzai Gakkaishi 36:454–459

    CAS  Google Scholar 

  8. 8.

    Yasuda S, Murase N (1995) Chemical structures of sulfuric acid lignin. XII. Reaction of lignin models with carbohydrates in 72% H2SO4. Holzforschung 49:418–422

    CAS  Article  Google Scholar 

Download references

Author information

Affiliations

Authors

Corresponding author

Correspondence to Seiichi Yasuda.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Yasuda, S., Fukushima, K. & Kakehi, A. Formation and chemical structures of acid-soluble lignin I: sulfuric acid treatment time and acid-soluble lignin content of hardwood. J Wood Sci 47, 69–72 (2001). https://doi.org/10.1007/BF00776648

Download citation

Key words

  • Acid-soluble lignin
  • Klason lignin
  • Sulfuric acid lignin
  • Hardwood