Balaei F, Ghobadi S, Khodarahmi R, Mohammadi S. Bilayer electrospun nanofibrous membrane: A matrix for lipase immobilization with high stability and reusability and its application on the synthesis of benzyl acetate.
Int J Biol Macromol 2025;
311:143893. [PMID:
40339843 DOI:
10.1016/j.ijbiomac.2025.143893]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2025] [Revised: 04/21/2025] [Accepted: 05/01/2025] [Indexed: 05/10/2025]
Abstract
A cold-adapted recombinant lipase from the deep-sea psychrophilic bacterium Psychrobacter sp. C18 was purified and immobilized onto glutaraldehyde-activated bilayer nanofibers (BNFs) composed of polycaprolactone, chitosan, polyvinyl alcohol, and zinc oxide (PCL/Cs/PVA/ZnO), fabricated by electrospinning. The nanofibers were characterized using Scanning Electron Microscopy and Fourier Transform Infrared Spectroscopy, confirming their favorable morphology and chemical structure. Immobilization of Lipase C18 onto BNFs led to notable biochemical changes. While the free enzyme showed optimum activity at pH 8.0, the immobilized form shifted to ~pH 6.0, likely due to local microenvironmental effects. The immobilized lipase exhibited improved thermal and pH stability, enhanced storage durability, and better tolerance to mono- and divalent metal ions such as Na+, Fe2+, and Mg2+. Operational stability tests demonstrated that 91 % of enzymatic activity was retained after 20 reuse cycles. In transesterification reactions, the immobilized enzyme outperformed the free form, yielding more benzyl acetate, emphasizing its potential in fragrance and cosmetic industries. The bilayer nanofiber system provided superior performance over conventional immobilization supports, with the hydrophilic top layer enhancing wettability and the matrix structure improving enzyme functionality and robustness.
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