Adsorption of cellulases on steam-pretreated willow

  • Mats Galbe
  • Robert Eklund
  • Guido Zacchi
Session 1 Thermal and Chemical Processing


The adsorption of cellulases on steam-pretreated willow has been measured for2, 4, and 8 wt% willow and with varying enzyme concentrations (2–100 wt% based on substrate). The enzyme concentration was measured as soluble protein, filter paper activity (FPA), CMC-ase activity, and activity toward willow. The adsorption data were modeled with a Langmuir isotherm. The maximum adsorption capability depends on the method for measurement of the enzyme concentration. The lowest value, 470 mg enzyme/g willow, was obtained for the soluble protein and the highest value, 650 mg/g, for the FPA. For technical applications, a single isotherm can be used for calculation of the adsorption capability of steam-treated willow.

Index Entries

adsorption cellulases willow enzyme recovery 

Abbreviations Used


adsorbed enzyme (g/L)


Ea/So(g enzyme adsorbed/kg ODM)


maximum adsorbed enzyme (g enzyme/kg ODM)


initial enzyme concentration (g/L)


enzyme concentration in supernatant (g/L)


adsorption equilibrium constant (g/L)


substrate concentration (kg/L)


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Copyright information

© Humana Press Inc. 1990

Authors and Affiliations

  • Mats Galbe
    • 1
  • Robert Eklund
    • 1
  • Guido Zacchi
    • 1
  1. 1.Chemical Engineering IUniversity of LundLundSweden

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