Abstract
Phenylalanine ammonia lyase (PAL) from Rhodotorula glutinis was encapsulated within polyethyleneimine-mediated biomimetic silica. The main factors in the preparation of biomimetic silica were optimized by response surface methodology (RSM). Compared to free PAL (about 2 U), the encapsulated PAL retained more than 43 % of their initial activity after 1 h of incubation time at 60 °C, whereas free PAL lost most of activity in the same conditions. It was clearly indicated that the thermal stability of PAL was improved by encapsulation. Moreover, the encapsulated PAL exhibited the excellent stability of the enzyme against denaturants and storage stability, and pH stability was improved by encapsulation. Operational stability of 7 reaction cycles showed that the encapsulated PAL was stable. Nevertheless, the K m value of encapsulated PAL in biomimetic silica was higher than that of the free PAL due to lower total surface area and increased mass transfer resistance.
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Acknowledgments
The project was partially supported by the National Natural Science Foundation of China (project no. 21072041). Dr. J.D. Cui also thanks the supports from the Natural Science Foundation of Hebei Province, China (project no. B2014208054) and the Foundation of Hebei University of Science and Technology (project no. SW10).
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Cui, J., Liang, L., Han, C. et al. Stabilization of Phenylalanine Ammonia Lyase from Rhodotorula glutinis by Encapsulation in Polyethyleneimine-Mediated Biomimetic Silica. Appl Biochem Biotechnol 176, 999–1011 (2015). https://doi.org/10.1007/s12010-015-1624-0
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DOI: https://doi.org/10.1007/s12010-015-1624-0