Effects of Macroporous Resin Size onCandidaantarcticaLipase B Adsorption, Fraction of Active Molecules, and Catalytic Activity for Polyester Synthesis

南极洲假丝酵母 化学 聚合 吸附 粒径 脂肪酶 聚酯纤维 催化作用 高分子化学 核化学 有机化学 聚合物 物理化学
作者
Bo Chen,Elizabeth M. Miller,Lisa M. Miller,John J. Maikner,Richard A. Gross
出处
期刊:Langmuir [American Chemical Society]
卷期号:23 (3): 1381-1387 被引量:96
标识
DOI:10.1021/la062258u
摘要

Methyl methacrylate resins with identical average pore diameter (250 Å) and surface area (500 m2/g) but with varied particle size (35 to 560−710 μm) were employed to study how immobilization resin particle size influences Candida antarctica Lipase B (CALB) loading, fraction of active sites, and catalytic properties for polyester synthesis. CALB adsorbed more rapidly on smaller beads. Saturation occurred in less than 30 s and 48 h for beads with diameters 35 and 560−710 μm, respectively. Linearization of adsorption isotherm data by the Scatchard analysis showed for the 35 μm resin that: (i) CALB loading at saturation was well below that required to form a monolayer and fully cover the support surface and (ii) CALB has a high affinity for this resin surface. Infrared microspectroscopy showed that CALB forms protein loading fronts for resins with particle sizes 560−710 and 120 μm. In contrast, CALB appears evenly distributed throughout 35 μm resins. By titration with p-nitrophenyl n-hexyl phosphate (MNPHP), the fraction of active CALB molecules adsorbed onto resins was <50% which was not influenced by particle size. The fraction of active CALB molecules on the 35 μm support increased from 30 to 43% as enzyme loading was increased from 0.9 to 5.7% (w/w) leading to increased activity for ε-caprolactone (ε-CL) ring-opening polymerization. At about 5% w/w CALB loading, by decreasing the immobilization support diameter from 560−710 to 120, 75, and 35 μm, conversion of ε-CL % to polyester increased (20 to 36, 42, and 61%, respectively, at 80 min). Similar trends were observed for condensation polymerizations between 1,8-octanediol and adipic acid.
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