NDLI: Recycle Use of Sphingomonas sp. CDH-7 Cells for Continuous Degradation of Carbazole in the Presence of MgCl2

Content Provider	Springer Nature Link
Author	Nakagawa, Hiroyuki Kirimura, Kohtaro Nitta, Takako Ki, Kuniki Kurane, Ryuichiro Usami, Shoji
Copyright Year	2002
Abstract	Carbazole (CA) is a heterocyclic nitrogen compound contained in the crude petroleum oil and recalcitrant to removal through the refinery processes. For development of the efficient CA-degradation bioprocess, conditions for the recycle use of Sphingomonas sp. CDH-7 resting cells were examined. When the resting cells (O.D.660 3.3) were shaken in 50 mM K2HPO4-KH2PO4 buffer (pH 7.0) containing CA 1000 mg/L, CA 880 mg/L was degraded within 3 h, but thereafter the activity decreased markedly. However, the activity was found to be restored to the initial level after the shaking treatment for 3 h in CA-free medium solution or in the buffer containing 20 mM MgCl2. Although the CA-degradation activity of CDH-7 resting cells was lost after 3 h of shaking in the buffer containing 100 mM EDTA, it was restored through the shaking treatment for 3 h in the buffer containing 20 mM MgCl2. When CA was periodically added eight times at a concentration of 100 mg/L (0.599 mM) to the reaction mixture containing the resting cells, CA 778 mg/L (4.66 mM) was continuously degraded within 35 h by the recycle use of resting cells, with the restoration treatment after each CA-degradation reaction by the resting cells.
Starting Page	251
Ending Page	256
Page Count	6
File Format	PDF
ISSN	03438651
Journal	Current Microbiology
Volume Number	44
Issue Number	4
e-ISSN	14320991
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-04-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Medicine Microbiology Applied Microbiology and Biotechnology

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