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Recycling cellulases by pH-triggered adsorption-desorption during the enzymatic hydrolysis of lignocellulosic biomass

Applied Microbiology and Biotechnology volume 98, pages 5765–5774 (2014)Cite this article

Abstract

Recycling of cellulases is an effective way to reduce the cost of enzymatic hydrolysis for the production of cellulosic ethanol. In this study, we examined the adsorption and desorption behaviors of cellulase at different pH values and temperatures. Furthermore, we developed a promising way to recover both free and bound cellulases by pH-triggered adsorption-desorption. The results show that acidic pH (e.g., pH 4.8) was found to favor adsorption, whereas alkaline pH (e.g., pH 10) and low temperature (4–37 °C) favored desorption. The adsorption of cellulases reached an equilibrium within 60 min at pH 4.8 and 25 °C, leading to approximately 50 % of the added cellulases bound to the substrate. By controlling the pH of eluent (citrate buffer, 25 °C), we were able to increase the desorption efficiency of bound cellulases from 15 % at pH 4.8 to 85 % at pH 10. To recover cellulases after enzymatic hydrolysis, we employed adsorption by fresh substrate and desorption at pH 10 to recover the free cellulases in supernatant and the bound cellulases in residue, respectively. The recycling performance (based on the glucose yield) of this simple strategy could reach near 80 %. Our results provided a simple, low-cost, and effective approach for cellulase recycling during the enzymatic hydrolysis of lignocellulosic biomass.

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Acknowledgments

The authors acknowledge the financial supports received from the National Natural Science Foundation of China (Nos. 21276192 and 20976125) and Tianjin (No. 11JCYBJC04400), Open Funding Project of the State Key Laboratory of Chemical Engineering (No. SKL-ChE-11B01), and the Ministry of Education (Nos. NCET-11-0372, 20110032130004, and B06006).

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Affiliations

  1. Collaborative Innovation Center of Chemical Science and Engineering, State Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of Membrane Science and Desalination Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People’s Republic of China

    Yaping Shang, Rongxin Su, Yang Yang, Wei Qi, Qiujin Li & Zhimin He

  2. School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, People’s Republic of China

    Renliang Huang

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  1. Yaping Shang
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  2. Rongxin Su
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  3. Renliang Huang
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  4. Yang Yang
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  5. Wei Qi
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  6. Qiujin Li
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  7. Zhimin He
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Correspondence to Rongxin Su or Renliang Huang.

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Shang, Y., Su, R., Huang, R. et al. Recycling cellulases by pH-triggered adsorption-desorption during the enzymatic hydrolysis of lignocellulosic biomass. Appl Microbiol Biotechnol 98, 5765–5774 (2014). https://doi.org/10.1007/s00253-014-5761-0

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  • DOI: https://doi.org/10.1007/s00253-014-5761-0

Keywords

  • Cellulases
  • Adsorption
  • Desorption
  • Lignocellulose
  • Ethanol
  • Enzymatic hydrolysis