کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
634985 | 1456085 | 2012 | 7 صفحه PDF | دانلود رایگان |
In this study, an immobilized metal ion affinity membrane (IMAM) was prepared and used to immobilize penicillin G acylase (PGA). The stability of storage of the immobilized PGA membrane (IPM) was tested. When stored in deionized water (DI) at 4 °C, only 19% residual activity of IPM was retained for 10 days. However, when stored in 10 mM phosphate buffer (PB, pH 8) with 0.1% NaN3, the IPM can retain 99% of its activity for a 10-day reaction and storage test. The feasibility of the IPM regeneration after a long period of reaction was investigated. When using 100 mM EDTA as the stripping solution, the re-immobilized capacity for PGA is only 52% of the original one after 4 regenerations. When the regeneration process was modified by using the stripping solution (300 mM NaCl, 25 mM EDTA, 20 mM PB, pH 8) for 30 min, then immersed in 0.5 M HCl and 0.5 M NaOH respectively for 10 min, the resulting IMAM can reserve 99% PGA immobilized activity after 5 regenerations.
► PGA was immobilized onto IMAM with coordination bonds as IPM.
► The combined-stripping procedure was developed for IPM regeneration.
► Little activity loss was observed for IPM under 5 regenerations.
► The continuous flow type IPM reactor was employed for 6-APA production.
► The regenerated process facilitates the IPM's applications in industry.
Journal: Journal of Membrane Science - Volumes 401–402, 15 May 2012, Pages 33–39