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Covalent Immobilization of Marine Candida Rugosa Lipase Using Amino Carrier |
Heng ZHU1,2,Hai-jiao LIN1,2,Ji-fu ZHANG3,Yun ZHANG1,Ai-jun SUN1,Yun-feng HU1,**() |
1 CAS Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301,China 2 University of Chinese Academy of Sciences,Beijing 100049,China 3 Guangdong Provincial Hospital of Chinese Medicine, Guangzhou 510120,China |
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Abstract Covalent binding is one important immobilization method of industrial enzyme, which uses stable covalent bonds to immobilize industrial enzymes, creates multi-point covalent connections between carrier and enzyme, and prepares immobilized enzymes with good stability and possesses practical application value. Marine Candida rugosa lipase was immobilized using amino carrier through covalent binding method and relative inexpensive glutaraldehyde was used as the crosslinking reagent. By using single factor and orthogonal experiment, the optimal immobilization conditions were determined as follows:25℃, pH5.0,0.1% glutaraldehyde,0.25g carrier, crosslinked 0.5h,immobilization time 1h, enzyme loading 800U, with the final obtained enzyme activity being 83.01U/g. Compared with free enzyme, the optimal pH of immobilized lipase was shifted to alkaline direction, the optimal reaction temperature was increased by 10℃, the thermal stability and acid-alkali stability of immobilized enzyme were better than that of free enzyme, and the reusability and storage stability were better than that of free enzyme. Meanwhile, crosslinking agent was found to be an important factor in the preparation of immobilized lipase. Thus it is of great significance to explore new crosslinking agent to improve immobilization effect. A good foundation for the immobilization technique and industrial application of marine candida rugosa lipase were laid.
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Received: 29 December 2018
Published: 05 August 2019
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Corresponding Authors:
Yun-feng HU
E-mail: yunfeng.hu@scsio.ac.cn
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