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Chen Q, Liu D, Wu C, Yao K, Li Z, Shi N, Wen F, Gates ID. Co-immobilization of cellulase and lysozyme on amino-functionalized magnetic nanoparticles: An activity-tunable biocatalyst for extraction of lipids from microalgae. Bioresour Technol 2018; 263:317-324. [PMID: 29753933 DOI: 10.1016/j.biortech.2018.04.071] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2018] [Revised: 04/17/2018] [Accepted: 04/18/2018] [Indexed: 06/08/2023]
Abstract
An activity-tunable biocatalyst for Nannochloropsis sp. cell-walls degradation was prepared by co-immobilization of cellulase and lysozyme on the surface of amino-functionalized magnetic nanoparticles (MNPs) employing glutaraldehyde. The competition between cellulase and lysozyme during immobilization was caused by the limited active sites of the MNPs. The maximum recovery of activities (cellulase: 78.9% and lysozyme: 69.6%) were achieved due to synergistic effects during dual-enzyme co-immobilization. The thermal stability in terms of half-life of the co-immobilized enzymes was three times higher than that in free form and had higher catalytic efficiency for hydrolysis of cell walls. Moreover, the co-immobilized enzymes showed greater thermal stability and wider pH tolerance than free enzymes under harsh conditions. Furthermore, the co-immobilized enzymes retained up to 60% of the residual activity after being recycled 6 times. This study provides a feasible approach for the industrialization of enzyme during cell-walls disruption and lipids extraction from Nannochloropsis sp.
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Affiliation(s)
- Qingtai Chen
- State Key Laboratory of Heavy Oil Processing, and College of Chemical Engineering, China University of Petroleum, Qingdao, Shandong 266580, China
| | - Dong Liu
- State Key Laboratory of Heavy Oil Processing, and College of Chemical Engineering, China University of Petroleum, Qingdao, Shandong 266580, China.
| | - Chongchong Wu
- Department of Chemical and Petroleum Engineering, University of Calgary, T2N 1N4 Calgary, Alberta, Canada
| | - Kaisheng Yao
- School of Chemical Engineering and Pharmaceutics, Henan University of Science and Technology, Luoyang, Henan 471003, China
| | - Zhiheng Li
- State Key Laboratory of Heavy Oil Processing, and College of Chemical Engineering, China University of Petroleum, Qingdao, Shandong 266580, China
| | - Nan Shi
- State Key Laboratory of Heavy Oil Processing, and College of Chemical Engineering, China University of Petroleum, Qingdao, Shandong 266580, China
| | - Fushan Wen
- College of Science, China University of Petroleum, Qingdao, Shandong 266580, China
| | - Ian D Gates
- Department of Chemical and Petroleum Engineering, University of Calgary, T2N 1N4 Calgary, Alberta, Canada
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