Publication date: April 2017
Source:International Journal of Biological Macromolecules, Volume 97
Author(s): Saima Rehman, Ping Wang, Haq Nawaz Bhatti, Muhammad Bilal, Muhammad Asgher
Lipases are one of the most proficient biocatalysts having enormous biotechnological prospective. Immobilization offers a potential solution to improve the stability and recycling characteristics of lipases. An extracellular lipase from Penicillium notatum (PNL) was immobilized in silicon polymers (SiP) through entrapment, and subsequently coated this matrix on the network of fibers in the sponges. The silicone polymers-immobilized lipase (SiP-lipase) displayed highest apparent activity and entrapment efficiency of 1.19Ug−1 polymers and 92.3%, respectively. It also exhibited greater catalytic activity in broad-working pHs and higher temperature than equivalent free-state of enzyme. Immobilization caused an improvement in thermo-stability of the lipase with an increase in energy of activation. The recycling potential of SiP-lipase was investigated. After reusing the sponge pieces for ten reaction cycles, the SiP preserved its structure without leakage of enzyme, and retained around 90% of its original activity. The SiP surface analysis was envisaged by scanning electron microscopy that further confirmed the recycling efficiency of SiP-lipase. Overall, SiP-lipase displayed a number of useful properties that make it a promising candidate for future applications in different chemical processes.
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