title: Enhanced catalytic activity of lipase encapsulated in PCL nanofibers.
abstract: Use of biocatalysis for industrial synthetic chemistry is on the verge of significant growth. Enzyme immobilization as an effective strategy for improving the enzyme activity has emerged from developments especially in nanoscience and nanotechnology. Here, lipase from Burkholderia cepacia (LBC), as an example of the luxuriant enzymes, was successfully encapsulated in polycaprolactone (PCL) nanofibers, proven by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Evaluated in both organic and aqueous medium, the activation factor of the encapsulated enzymes in the hydrolysis reaction was generally higher than that in the transesterification reaction. Enhanced catalytic activities were found when 5-20 w/w % of LBC was loaded. The effect of different solvents pretreatment on the activity of immobilized LBC was also investigated. The highest activation factor was found up to 14 for the sample containing acetone-treated LBC/PCL (10 w/w %). The encapsulated lipase reserved 50% of its original activity after the 10th run in the transesterification reaction in hexane medium. The mechanism of activation of lipase catalytic ability based on active PCL nanofiberous matrix is proposed.
authors.affiliation: Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus C DK-8000, Denmark.
authors.forename: Jie
authors.initials: J
authors.lastname: Song
authors.forename: Derya
authors.initials: D
authors.lastname: Kahveci
authors.forename: Menglin
authors.initials: M
authors.lastname: Chen
authors.forename: Zheng
authors.initials: Z
authors.lastname: Guo
authors.forename: Erqing
authors.initials: E
authors.lastname: Xie
authors.forename: Xuebing
authors.initials: X
authors.lastname: Xu
authors.forename: Flemming
authors.initials: F
authors.lastname: Besenbacher
authors.forename: Mingdong
authors.initials: M
authors.lastname: Dong
mesh_terms: D055162:Biocatalysis; D016956:Burkholderia cepacia / Q000201:enzymology; D002214:Capsules; D004795:Enzyme Stability; D004800:Enzymes, Immobilized / Q000737:chemistry* / Q000378:metabolism*; D004952:Esters; D005990:Glycerol / Q000737:chemistry; D008049:Lipase / Q000737:chemistry* / Q000378:metabolism*; D057139:Nanofibers / Q000737:chemistry*; D011091:Polyesters / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D002214:Capsules; D004800:Enzymes, Immobilized; D004952:Esters; D011091:Polyesters; D012997:Solvents; D014867:Water; C016240:polycaprolactone; D008049:Lipase; D005990:Glycerol