Lipopeptide biosurfactant production by chitosan-immobilized Bacillus sp. GY19 and their recovery by foam fractionation

•Presence of chitosan solved foaming problem in stirred tank fermenter.•Lipopeptide production by immobilized bacteria was repeatable at least 6 cycles.•Addition of palm oils to waste glycerol based medium increased lipopeptide yield.•Lipopeptides were easily recovered from culture medium by foam fr...

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Published inBiochemical engineering journal Vol. 93; pp. 47 - 54
Main Authors Khondee, Nichakorn, Tathong, Sitti, Pinyakong, Onruthai, Müller, Rudolf, Soonglerdsongpha, Suwat, Ruangchainikom, Chalermchai, Tongcumpou, Chantra, Luepromchai, Ekawan
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.01.2015
Subjects
Bacillus
Chitosan
Downstream processing
Fermentation
Immobilization
Lipopeptide production
Optimization
Immobilization
Chitosan
Fermentation
Lipopeptide production
Optimization
Downstream processing
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Abstract •Presence of chitosan solved foaming problem in stirred tank fermenter.•Lipopeptide production by immobilized bacteria was repeatable at least 6 cycles.•Addition of palm oils to waste glycerol based medium increased lipopeptide yield.•Lipopeptides were easily recovered from culture medium by foam fractionation.•Foamate containing lipopeptides could be used directly for petroleum remediation. Bacillus sp. GY19 was immobilized on chitosan to increase cell density and facilitate lipopeptide production. Palm oil was added to a waste glycerol based medium as precursor for the lipopeptides. The immobilized cells could be reused in stirred tank fermenter for at least 6 cycles with an optimal condition of 80g/L immobilized cells, 10% (v/v) waste glycerol and 1.25% (v/v) palm oil. The highest lipopeptide concentration observed during the steady state was 7.12g/L. The presence of chitosan in the fermenter reduced foaming problems due to its absorption property, which could interrupt the aggregation of air bubble and lipopeptides. The lipopeptides were separated and purified from the culture medium by a simple design foam fractionation unit. The amounts of lipopeptides in foamate produced from palm oil and crude palm oil added culture media were 10.9 and 9.8g/L, respectively. HPLC profile of lipopeptide extracted from the foamate had less impurity peaks than that from the culture medium. Both foamate samples showed 100% oil displacement efficiency with diesel oil, followed by Arabian light oil and heavy oil. It is thus possible to apply the sequential lipopeptide production and recovery process for producing a ready-to-use foamate for petroleum remediation.
AbstractList Bacillus sp. GY19 was immobilized on chitosan to increase cell density and facilitate lipopeptide production. Palm oil was added to a waste glycerol based medium as precursor for the lipopeptides. The immobilized cells could be reused in stirred tank fermenter for at least 6 cycles with an optimal condition of 80 g/L immobilized cells, 10% (v/v) waste glycerol and 1.25% (v/v) palm oil. The highest lipopeptide concentration observed during the steady state was 7.12 g/L. The presence of chitosan in the fermenter reduced foaming problems due to its absorption property, which could interrupt the aggregation of air bubble and lipopeptides. The lipopeptides were separated and purified from the culture medium by a simple design foam fractionation unit. The amounts of lipopeptides in foamate produced from palm oil and crude palm oil added culture media were 10.9 and 9.8 g/L, respectively. HPLC profile of lipopeptide extracted from the foamate had less impurity peaks than that from the culture medium. Both foamate samples showed 100% oil displacement efficiency with diesel oil, followed by Arabian light oil and heavy oil. It is thus possible to apply the sequential lipopeptide production and recovery process for producing a ready-to-use foamate for petroleum remediation.
•Presence of chitosan solved foaming problem in stirred tank fermenter.•Lipopeptide production by immobilized bacteria was repeatable at least 6 cycles.•Addition of palm oils to waste glycerol based medium increased lipopeptide yield.•Lipopeptides were easily recovered from culture medium by foam fractionation.•Foamate containing lipopeptides could be used directly for petroleum remediation. Bacillus sp. GY19 was immobilized on chitosan to increase cell density and facilitate lipopeptide production. Palm oil was added to a waste glycerol based medium as precursor for the lipopeptides. The immobilized cells could be reused in stirred tank fermenter for at least 6 cycles with an optimal condition of 80g/L immobilized cells, 10% (v/v) waste glycerol and 1.25% (v/v) palm oil. The highest lipopeptide concentration observed during the steady state was 7.12g/L. The presence of chitosan in the fermenter reduced foaming problems due to its absorption property, which could interrupt the aggregation of air bubble and lipopeptides. The lipopeptides were separated and purified from the culture medium by a simple design foam fractionation unit. The amounts of lipopeptides in foamate produced from palm oil and crude palm oil added culture media were 10.9 and 9.8g/L, respectively. HPLC profile of lipopeptide extracted from the foamate had less impurity peaks than that from the culture medium. Both foamate samples showed 100% oil displacement efficiency with diesel oil, followed by Arabian light oil and heavy oil. It is thus possible to apply the sequential lipopeptide production and recovery process for producing a ready-to-use foamate for petroleum remediation.
Author Müller, Rudolf
Ruangchainikom, Chalermchai
Soonglerdsongpha, Suwat
Tathong, Sitti
Pinyakong, Onruthai
Khondee, Nichakorn
Tongcumpou, Chantra
Luepromchai, Ekawan
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Keywords Immobilization
Chitosan
Fermentation
Lipopeptide production
Optimization
Downstream processing
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Snippet •Presence of chitosan solved foaming problem in stirred tank fermenter.•Lipopeptide production by immobilized bacteria was repeatable at least 6...
Bacillus sp. GY19 was immobilized on chitosan to increase cell density and facilitate lipopeptide production. Palm oil was added to a waste glycerol based...
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StartPage 47
SubjectTerms Bacillus
Chitosan
Downstream processing
Fermentation
Immobilization
Lipopeptide production
Optimization
Title Lipopeptide biosurfactant production by chitosan-immobilized Bacillus sp. GY19 and their recovery by foam fractionation
URI https://dx.doi.org/10.1016/j.bej.2014.09.001
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