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Influence of the chemical composition of kenaf bast and core on the alkaline pulping response


The bast and core of kenaf,Hibiscus cannabinus L., have markedly different chemical components and alkaline cooking responses. The bast had about double the hot-water extractives content and only about half the lignin content of the core. The core contained a large amount of hemicellulose, mostly composed of xylan. The lignin structures of bast and core were also quite different: The former had a significant abundance of syringyl structures. Evidence showed that the bast was much more easily delignified than the core. When the bast and core were cooked together in alkaline condition, the pulp yields at the same kappa number were higher than those of the individual pulpings of bast and core. The bast-core pulping gave a positive effect on the yield of bast pulp in the sodaanthraquinone and kraft pulpings. On the other hand, kenaf was abundant in the hot water extractives. These extractives consumed alkali during cooking to a relatively large extent but acted as a protector of hemicellulose and slightly increased the pulp yields.


  1. 1.

    Morimoto M (1999) Recent topics on the utilization of non-wood plant fibers — from FAO yearbook forest products 1997-. Jpn J Paper Technol 42(9):1–5

    Google Scholar 

  2. 2.

    Morimoto M (1998) Nonwood plant fiber pulp — the status quo and future. Jpn TAPPI 52:1205–1211

    CAS  Article  Google Scholar 

  3. 3.

    Kaldor AF (1992) Kenaf, an alternate fiber for the pulp and paper industries in developing and developed countries. TAPPI J 75(10):141–145

    Google Scholar 

  4. 4.

    Neto CP, Seca A, Fradinho D, Coimbra MA, Domingues F, Evtuguin D, Silvestre A, Cavaleiro JAS (1996) Chemical composition and structural features of the macromolecular components of Hibiscus cannabinus grown in Portugal. Ind Crop Prod 5:189–196

    Article  Google Scholar 

  5. 5.

    Seca AML, Cavaleiro JAS, Domingues FMJ, Silvestre AJD, Evtuguin D, Neto CP (1997) Structural characteristics of the bark and core kenaf lignin (variety Salvador). In: Proceedings 9th International Symposium on Wood and Pulping Chemistry, June 9–12, Montreal, (132) 1–4

  6. 6.

    Seca AML, Cavaleiro JAS, Domingues FMJ, Silvestre AJD, Evtuguin D, Neto CP (1998) Structural characterization of the bark and core lignins from kenaf (Hibiscus cannabinus). J Agric Food Chem 46:3100–3108

    CAS  Article  Google Scholar 

  7. 7.

    Pande H, Roy DN (1996) Delignification kinetics of soda pulping of kenaf. J Wood Chem Technol 16:311–325

    CAS  Article  Google Scholar 

  8. 8.

    TAPPI test methods, T222 om-88. TAPPI Press, Atlanta, GA

  9. 9.

    TAPPI useful method 250. TAPPI Press, Atlanta, GA

  10. 10.

    Usuda M, Mizumachi H, Iiyama K. Morohoshi N. Yamaguchi A (eds) (1985) Mokuzai Kagaku Jikkensho II Kagaku-hen, Chugai-Sangyo,p 155

  11. 11.

    TAPPI Test Methods, T203 om-93. TAPPI Press, Atlanta, GA

  12. 12.

    Usuda M, Mizumachi H, Iiyama K, Morohoshi N, Yamaguchi A (eds) (1985) Mokuzai Kagaku Jikkensho II Kagaku-hen, Chugai-Sangyo, pp 187–190

  13. 13.

    Chen CL (1992) Nitrobenzene and cupric oxide oxidations. In: Lin SY, Dence CW (eds) Methods in lignin chemistry. Springer, Berlin, pp 301–321

    Google Scholar 

  14. 14.

    Usuda M, Mizumachi H, Iiyama K, Morohoshi N, Yamaguchi A (eds) (1985) Mokuzai Kagaku Jikkensho II Kagaku-hen, Chugai-Sangyo, pp 160–161

  15. 15.

    Ohtani Y, Noguchi T, Sameshima K (1996) Influence of anthraquinone addition method on alkaline pulping of kenaf bast. Sen'i Gakkaishi 52:175–179

    CAS  Article  Google Scholar 

  16. 16.

    TAPPI Test Methods, T236 cm-85. TAPPI Press, Atlanta, GA

  17. 17.

    Aorigele, Konno H, Sano Y, Uraki Y, Sasaya N, Sameshima K (1993) Separation and utilization of kenaf components obtained by continuous acetic acid pulping under normal pressure (in Japanese). In: Proceedings of the Hokkaido Branch, Japan Wood Research Society, vol 25, pp 57–61

    Google Scholar 

  18. 18.

    Abbott TP, Bagby MO, James C, Peterson RE (1986) A14C balance on nitrobenzene oxidized kenaf lignin. J Wood Chem Technol 6:487–494

    CAS  Article  Google Scholar 

  19. 19.

    Ralph J (1996) An unusual lignin from kenaf. J Natural Prod 59:341–342

    CAS  Article  Google Scholar 

  20. 20.

    Abbott TP, Tjarks LW, Bagby MO (1987) Kenaf lignin structure by correlation of CMR, FTIR and chemical analysis. In: Proceedings of the Pulping Conference, pp 177–183

  21. 21.

    Abbott TP, Palmer DM, Gordon SH, Bagby MO (1988) Solid state analysis of plant polymers by FTIR. J Wood Chem Technol 8:1–28

    CAS  Article  Google Scholar 

  22. 22.

    Kuroda K, Mazumder BB, Ohtani Y, Sameshima K (1999) Characterization of kenaf (Hibiscus cannabinus L.) lignin by analytical pyrolysis. In: Proceedings of the 2nd annual meeting of the American Kenaf Society, March, San Antonio, TX, pp 125–137

  23. 23.

    Wilder HD, Daleski EJ (1965) Delignification rate studies. Part II of a series on kraft pulping kinetics. TAPPI 48:293–297

    CAS  Google Scholar 

  24. 24.

    Wilson G, Proctor AR (1970) Reactions of wood components with hydrogen sulphide. Part V. The kinetics of kraft and soda delignification of western hemlock. Pulp Paper Mag Can 71:T483-T487

    CAS  Google Scholar 

  25. 25.

    Nakauchi A, Sameshima I, Ohtani Y, Sameshima K, Kumai S, Fukumi R (1998) Development of industrial plant resources in the Japanese mountainous villages. II. Analyses of kenaf chemical components as the plant resources for agroforestry. Bull Kochi Univ For 25:219–226

    Google Scholar 

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Correspondence to Yoshito Ohtani.

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Ohtani, Y., Mazumder, B.B. & Sameshima, K. Influence of the chemical composition of kenaf bast and core on the alkaline pulping response. J Wood Sci 47, 30–35 (2001).

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Key words

  • Kenaf
  • Bast and core
  • Alkaline pulping
  • Lignin
  • Hot-water extractives