Tailoring the Spacer Arm for Covalent Immobilization of Candida antarctica Lipase B—Thermal Stabilization by Bisepoxide-Activated Aminoalkyl Resins in …

E Abaházi, D Lestál, Z Boros, L Poppe - Molecules, 2016 - mdpi.com
E Abaházi, D Lestál, Z Boros, L Poppe
Molecules, 2016mdpi.com
An efficient and easy-to-perform method was developed for immobilization of Ca LB on
mesoporous aminoalkyl polymer supports by bisepoxide activation. Polyacrylate resins (100–
300 µm;~ 50 nm pores) with different aminoalkyl functional groups (ethylamine: EA and
hexylamine: HA) were modified with bisepoxides differing in the length, rigidity and
hydrophobicity of the units linking the two epoxy functions. After immobilization, the different
Ca LB preparations were evaluated using the lipase-catalyzed kinetic resolution (KR) of …
An efficient and easy-to-perform method was developed for immobilization of CaLB on mesoporous aminoalkyl polymer supports by bisepoxide activation. Polyacrylate resins (100–300 µm; ~50 nm pores) with different aminoalkyl functional groups (ethylamine: EA and hexylamine: HA) were modified with bisepoxides differing in the length, rigidity and hydrophobicity of the units linking the two epoxy functions. After immobilization, the different CaLB preparations were evaluated using the lipase-catalyzed kinetic resolution (KR) of racemic 1-phenylethanol (rac-1) in batch mode and in a continuous-flow reactor as well. Catalytic activity, enantiomer selectivity, recyclability, and the mechanical and long-term stability of CaLB immobilized on the various supports were tested. The most active CaLB preparation (on HA-resin activated with 1,6-hexanediol diglycidyl ether—HDGE) retained 90% of its initial activity after 13 consecutive reaction cycles or after 12 month of storage at 4 °C. The specific rate (rflow), enantiomer selectivity (E) and enantiomeric excess (ee) achievable with the best immobilized CaLB preparations were studied as a function of temperature in kinetic resolution of rac-1 performed in continuous-flow packed-bed bioreactors. The optimum temperature of the most active HA-HDGE CaLB in continuous-flow mode was 60 °C. Although CaLB immobilized on the glycerol diglycidyl ether (GDGE)-activated EA-resin was less active and less selective, a much higher optimum temperature (80 °C) was observed with this form in continuous-flow mode KR of rac-1.
MDPI
以上显示的是最相近的搜索结果。 查看全部搜索结果