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The Effective of Additives on the Immobilization of Lipase by Microporous Absorbent Resin |
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 Macroporous absorbent resin DA-201 was adopted as a carrier to immobilize marine-derived lipase, and the influence of additives on the immobilization process was explored. NH4Cl, mannose and glycine were used as the additives, and the conditions were optimized by a combination of single factor and orthogonal experiments. The results showed that the optimal conditions with additive NH4Cl were: citric acid-sodium citrate buffer pH6.0, immobilization temperature 30℃, carrier quantity 0.5g, NH4Cl concentration 25mmol/L, immobilized time 3.0h; enzyme activity reached 115.27U/g, which was 47.42% higher than that of the immobilized enzyme without additive. The optimal conditions with additive mannose were: potassium dihydrogen phosphate-sodium hydroxide buffer pH7.0, immobilized temperature 35℃, carrier quantity 0.5g, mannose concentration 10mmol/L, the immobilized time 4.5h; the enzyme activity reached 122.75U/g, which was 6.50% higher than that of the immobilized enzyme without additive. The optimal conditions with glycine additive: potassium dihydrogen phosphate-sodium hydroxide buffer pH7.0, immobilized temperature 20℃, carrier quantity 0.5g, the glycine concentration 25mmol/L, the immobilized time 7.5h; the enzyme activity reached 141.69U/g, which was 26.12% higher than that of the immobilized enzyme without additive. The addition of different additives exhibited great effects on the immobilization through absorbtion by macroporous absorbent resin DA-201 and could greatly improve the adsorption efficiency. Additionally, buffer type, pH, temperature, additive concentration and immobilization time were found to have great influence on the adsorption of lipase by resin DA-201, which provides good reference for subsequent research of the immobilization of industrial enzymes.
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Received: 01 November 2018
Published: 08 May 2019
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Corresponding Authors:
Yun-feng HU
E-mail: yunfeng.hu@scsio.ac.cn
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