Applied Biochemistry and Biotechnology

, Volume 167, Issue 2, pp 377–393 | Cite as

Modeling of Pretreatment Condition of Extrusion-Pretreated Prairie Cordgrass and Corn Stover with Poly (Oxyethylen)20 Sorbitan Monolaurate

  • Anahita Dehkhoda Eckard
  • Kasiviswanathan Muthukumarappan
  • William Gibbons
Article

Abstract

Extrusion processing has shown potential to be used as a pretreatment method for second-generation bioethanol production. Furthermore, surfactants have been shown to reduce enzyme deactivation and increase the efficiency of hydrolysis. Therefore, a sequential pretreatment technique was developed for corn stover (CS) and prairie cordgrass (PCG) in which a single screw extruder was used for the first pretreatment according to a previously optimized condition using 70–180 °C for feed, barrel, and die zones with 65–155 rpm screw speed. The second pretreatment was optimized in this study at 45–55 °C, 1–4 h, 0.15–0.6 g Tween 20/g glucan according to response surface methodology. Optimization of surfactant pretreatment facilitated the estimation of interaction and higher-order effects for major factors involved in surfactant treatment (temperature, time, surfactant loading). Using 8.6 FPU/g glucan cellulase, the optimum conditions found by fitting appropriate quadratic models to the data increased glucose and xylose yield by 27.5 and 33 % for CS and by 21.5 and 27 % for PCG, respectively. Tween 20 concentrations and pretreatment temperature were the most significant factors affecting sugar yield (p value <0.05). Studies of SDS concentration at and beyond critical micelle concentration (5.2–100 mM) demonstrated a decrease in sugar yield compared to control.

Keywords

Enzymatic hydrolysis Lignocellulose Pretreatment SDS Tween 20 Cellulase Micelles 

Notes

Acknowledgments

Funding support was provided by Sun Grant project titled “Development of pretreatment strategies”. The authors would also like to thank Novozymes Inc. for providing the commercial enzymes. We would also thank Dr. Karunanithy who helped in the extrusion of corn stover and prairie cordgrass.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Anahita Dehkhoda Eckard
    • 1
  • Kasiviswanathan Muthukumarappan
    • 1
  • William Gibbons
    • 2
  1. 1.Department of Agricultural and Biosystems EngineeringSouth Dakota State UniversityBrookingsUSA
  2. 2.Department of Biology and MicrobiologySouth Dakota State UniversityBrookingsUSA

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