Identification and characterization of a pigment-producing denitrifying bacterium

Herein, a denitrifying bacterium that produced greenish fluorescent pigment under aerobic conditions was accidentally isolated from municipal sewage sludge. Using 16S-rDNA sequence analysis, we identified the isolate as Pseudomonas aeruginosa R12, with 100% similarity. We achieved the highest pigmen...

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Published in:Biotechnology and bioprocess engineering 2008, 13(2), , pp.217-223
Main Authors: Kim, J.B. (Pukyong National University, Busan, Republic of Korea), Cho, K.S. (Pukyong National University, Busan, Republic of Korea), Jeong, S.K. (Pukyong National University, Busan, Republic of Korea), Nam, S.W. (Dongeui University, Busan, Republic of Korea), Jeong, H.D. (Pukyong National University, Busan, Republic of Korea), Kim, J.K. (Pukyong National University, Busan, Republic of Korea), E-mail: junekim@pknu.ac.kr
Format: Article
Language:English
Subjects:
Aeration
Aerobic conditions
Ammonium sulfate
Anaerobic conditions
Antibacterial activity
Bacteria
Bioreactors
Biotechnology
characterization
Chemistry
Chemistry and Materials Science
culture condition
Denitrification
denitrifier
Fluorescence
Industrial and Production Engineering
Metabolites
Municipal wastes
Municipal wastewater
pigment production
Pigments
PSEUDOMONAS AERUGINOSA
Sequence analysis
Sewage sludge
생물공학
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cited_by cdi_FETCH-LOGICAL-c429t-71bcb3423fbc1f9248fddddc2abc52ebadd935f9505649af541bffb5ac64cfe23
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creator Kim, J.B. (Pukyong National University, Busan, Republic of Korea)
Cho, K.S. (Pukyong National University, Busan, Republic of Korea)
Jeong, S.K. (Pukyong National University, Busan, Republic of Korea)
Nam, S.W. (Dongeui University, Busan, Republic of Korea)
Jeong, H.D. (Pukyong National University, Busan, Republic of Korea)
Kim, J.K. (Pukyong National University, Busan, Republic of Korea), E-mail: junekim@pknu.ac.kr
description Herein, a denitrifying bacterium that produced greenish fluorescent pigment under aerobic conditions was accidentally isolated from municipal sewage sludge. Using 16S-rDNA sequence analysis, we identified the isolate as Pseudomonas aeruginosa R12, with 100% similarity. We achieved the highest pigment production rate (1.36 mg/L/h) in a 1-L bioreactor under aerobic conditions, using the optimal culture parameters determined in this study: 37℃, pH 8.0, 200 rpm, 5 vvm aeration, and medium containing succinate and (NH₄)₂SO₄. The pigment was not a secondary metabolite and had no antibacterial activity on its co-isolates. Under anaerobic conditions, the isolate produced mainly N₂ and behaved as a strong denitrifier, displaying synergistic denitrification with co-isolated denitrifiers. To our knowledge, herein we have described the first instance in which P. aeruginosa R12 produces a fluorescent pigment under aerobic conditions. This newly-isolated strain therefore shows potential as a commercial resource for natural pigment.
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(Pukyong National University, Busan, Republic of Korea)</au><au>Cho, K.S. (Pukyong National University, Busan, Republic of Korea)</au><au>Jeong, S.K. (Pukyong National University, Busan, Republic of Korea)</au><au>Nam, S.W. (Dongeui University, Busan, Republic of Korea)</au><au>Jeong, H.D. (Pukyong National University, Busan, Republic of Korea)</au><au>Kim, J.K. 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We achieved the highest pigment production rate (1.36 mg/L/h) in a 1-L bioreactor under aerobic conditions, using the optimal culture parameters determined in this study: 37℃, pH 8.0, 200 rpm, 5 vvm aeration, and medium containing succinate and (NH₄)₂SO₄. The pigment was not a secondary metabolite and had no antibacterial activity on its co-isolates. Under anaerobic conditions, the isolate produced mainly N₂ and behaved as a strong denitrifier, displaying synergistic denitrification with co-isolated denitrifiers. To our knowledge, herein we have described the first instance in which P. aeruginosa R12 produces a fluorescent pigment under aerobic conditions. This newly-isolated strain therefore shows potential as a commercial resource for natural pigment.</abstract><cop>Heidelberg</cop><pub>The Korean Society for Biotechnology and Bioengineering</pub><doi>10.1007/s12257-007-0201-y</doi><tpages>7</tpages></addata></record>
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subjects Aeration
Aerobic conditions
Ammonium sulfate
Anaerobic conditions
Antibacterial activity
Bacteria
Bioreactors
Biotechnology
characterization
Chemistry
Chemistry and Materials Science
culture condition
Denitrification
denitrifier
Fluorescence
Industrial and Production Engineering
Metabolites
Municipal wastes
Municipal wastewater
pigment production
Pigments
PSEUDOMONAS AERUGINOSA
Sequence analysis
Sewage sludge
생물공학
title Identification and characterization of a pigment-producing denitrifying bacterium
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