Preparation and properties of microencapsulated genetically engineered bacteria cells for oral therapy of uremia |
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Authors: | Hong?Gao Email author" target="_blank">Yaoting?YuEmail author Baoli?Cai Manyan?Wang |
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Institution: | e-mail: yaotingyu@ nankai.edu.cn |
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Abstract: | Microencapsulated genetically engineered bacteria cells are a novel approach of oral therapy for uremia. Klebsiella aerogenes urease genes (UreaDABCEFG) are transformed into E. coli DH5α cells through plasmid pKAU17. The transformant can use urea or ammonia as its sole nitrogen source through strain training.
The urease genetically engineered bacteria cells are entrapped in polyvinyl alcohol (PVA) microcapsules, which can be used
to remove urea from uremia patients. The mechanical strength of PVA microcapsules is significantly higher than that of APA
microcapsules. This suggests that the problem of friability of APA can be solved in this way. The optimal conditions for the
preparation of PVA microencapsulated genetically engineered bacterial cells are: polyvinyl alcohol (PVA, 2450±50) used as
the carrier at a concentration 6%, the pH value of boric acid as crosslinking reagent 6.5, crosslinking time 24 h, entrapment
ratio of bacteria 8%, air flow rate of the encapsulate device 3 L/min and liquid flow rate at 1 mL/10 min. The average diameter
of microcapsules prepared under these optimal conditions is 20–40 mesh. Experiments in vitro showed that one hundred milligrams of wet bacterial cells in PVA microcapsules could remove 18.4 mg of urea in 4 h. |
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Keywords: | uremia urea genetically engineered bacteria microcapsules PVA |
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