Vinoba M, Lim KS, Lee SH, Jeong SK, Alagar M. Immobilization of human carbonic anhydrase on gold nanoparticles assembled onto amine/thiol-functionalized mesoporous SBA-15 for biomimetic sequestration of CO2.
LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011;
27:6227-6234. [PMID:
21488617 DOI:
10.1021/la105029h]
[Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A biocatalyst was synthesized by immobilizing human carbonic anhydrase onto gold nanoparticles assembled over amine/thiol-functionalized mesoporous SBA-15. The physicochemical properties of the functionalized mesoporous SBA-15 were obtained by XRD, BET, FE SEM, HR TEM, EDS, and zeta potential analysis. The biocatalytic performance was studied for para-nitrophenyl acetate (p-NPA) hydrolysis. The kinetic parameters K(m) were found to be 22.35 and 27.75 mM, and K(cat)/K(m) values were 1514.09 and 1612.25 M(-1) s(-1) for HCA immobilized on gold nanoparticles assembled on amine/thiol-functionalized mesoporous SBA-15 (HCA/Au/APTES/SBA-15 and HCA/Au/MPTES/SBA-15), respectively. These HCA/Au/APTES/SBA-15 and HCA/Au/MPTES/SBA-15 were investigated for biocatalytic hydration of CO(2) and its precipitation as CaCO(3). The amount of CaCO(3) precipitated over HCA/Au/MPTES/SBA-15 was nearly the same as that precipitated over free HCA. Storage stability and reusability studies suggested that HCA/Au/MPTES/SBA-15 retained its activity even after 20 days storage at 25 °C and 20 recycling runs. The present results demonstrate that HCA/Au/MPTES/SBA-15 and HCA/Au/APTES/SBA-15 are highly efficient potential nanobiocatalysts for industrial-scale CO(2) sequestration.
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