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A novel cell modification method used in biotransformation of glycerol to 3-HPA by Lactobacillus reuteri.

Abstract：

:The aim of the present study was to develop a new cell modification method to facilitate the cell separation from broth. In order to reduce the transfer limitation of substrate and product caused by general immobilization methods in the following biotransformation of glycerol, the carboxyl-functioned superparamagnetic nanoparticle (MNP) was directly attached to the surface of Lactobacillus reuteri for 3-hydroxypropionealdehyde producing. The modification process could be finished in several minutes by just adding MNP fluid into the bulk fermentation broth. The modified cells could be rapidly separated from the solution with the aid of magnetic field. The interaction between cell and MNP was shown by electron microscopy. The efficiency of the cells attached by MNPs for transformation of various concentrations of glycerol (100-400 mM) was studied at various temperatures (25-40 °C) and pH levels (5.8-7.5) with different cell concentrations (7.5-30 g/L). The 3- hydroxypropionealdehyde (HPA)/glycerol molar conversion under optimal condition (30 °C and pH 7) reached 70 %. The inactive modified cell could be reactivated easily by fresh medium and recovered the ability of glycerol conversion. MNPS distributing on cell surface had little adverse effect on cell activity. The modification method simplified the two-step production of 3-HPA by resting L. reuteri. The method of MNPs attached to cell surface is totally different from the traditional immobilization method in which the cell is attached to or entrapped in big carrier. The results obtained in this study showed that carboxyl-functioned MNP could be directly used as cell modification particle and realized cell recycle with the aid of magnetic field in bioprocess.

journal_name

Appl Microbiol Biotechnol

journal_title

Applied microbiology and biotechnology

authors

Chen G,Chen J

doi

10.1007/s00253-013-4723-2

subject

Has Abstract

pub_date

2013-05-01 00:00:00

pages

4325-32

issue

10

eissn

0175-7598

issn

1432-0614

journal_volume

97

pub_type

杂志文章

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