Citation: Hong Tao Deng, Juan Juan Wang, Miao Ma, Zhong Yang Liu, Fei Zheng. Hydrophobic surface modification of chitosan gels by stearyl for improving the activity of immobilized lipase[J]. Chinese Chemical Letters, ;2009, 20(8): 995-999. doi: 10.1016/j.cclet.2009.03.037 shu

Hydrophobic surface modification of chitosan gels by stearyl for improving the activity of immobilized lipase

College of Chemistry, Central China Normal University, Wuhan 430079, China

Received Date: 17 November 2008

Fund Project: The authors are grateful for the financial support from the Natural Science Foundation of Hubei Province in China (No.2006ABA174).

The hydrophobic surface modification of chitosan gels was carried out using the amidating reaction of amido groups on a gel surface with stearic acid activated by 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS). Lipases from Candida rugosa were adsorbed on the nascent chitosan gels (CS) and stearyl-modified gels (SCS)with different degrees of amidation. The increased surface hydrophobicity of chitosan gels improved the adsorption capacity and activity of the immobilized lipase. SCS with 31.46% amidation showed the maximum activity retention (83.43%). The experimental results suggest that the moderate surface hydrophilicity/hydrophobicity of chitosan gels is necessary for the improvement of the activity of immobilized lipase.
- Lipase,
- Chitosan,
- Surface modification,
- Adsorption
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