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Poly-3-hydroxybutyrate production by Azotobacter vinelandii strains in batch cultures at different oxygen transfer rates.

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Title: Poly-3-hydroxybutyrate production by Azotobacter vinelandii strains in batch cultures at different oxygen transfer rates.
Authors: Díaz‐Barrera, Alvaro1, Andler, Rodrigo1, Martínez, Irene1, Peña, Carlos2
Source: Journal of Chemical Technology & Biotechnology. Apr2016, Vol. 91 Issue 4, p1063-1071. 9p.
Subjects: Poly-beta-hydroxybutyrate, Azotobacter vinelandii, Physiological transport of oxygen, Oxygen evolution reactions, Biodegradation, Polymers, Bacterial cultures
Abstract: BACKGROUND Poly-3-hydroxybutyrate ( PHB) is a polyester that can be accumulated by Azotobacter vinelandii. This polymer is a biodegradable thermoplastic material used for producing plastics for packaging, biobased films, and biocompatible implants. RESULTS PHB produced by wild-type A. vinelandii and a mutant OP strain were evaluated at different agitation rates. The oxygen transfer rate ( OTR) evolution was characterized in cultures grown at 300, 400, 500 and 600 rpm, showing for the first time the OTR evolution in cultures of mutant OP. Under the conditions evaluated, the cultures were limited by oxygen. In the cultures grown with the OP strain, lower OTR and specific oxygen uptake rate were obtained, indicating a lower necessity for oxygen for growth in this mutant. A higher amount of PHB can be produced by decreasing the OTR. A maximum PHB of 79% on dry weight was observed in the cultures with the wild-type strain, whereas the highest PHB productivity (0.18 g L−1 h−1) was obtained in cultures of A. vinelandii OP conducted at 600 rpm. CONCLUSION The amount of PHB produced during the period of oxygen limitation can be controlled by the OTR, opening the possibility to evaluate this parameter as a criterion for scaling-up PHB production by A. vinelandii. © 2015 Society of Chemical Industry [ABSTRACT FROM AUTHOR]
Copyright of Journal of Chemical Technology & Biotechnology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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  Data: Poly-3-hydroxybutyrate production by Azotobacter vinelandii strains in batch cultures at different oxygen transfer rates.
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  Data: <searchLink fieldCode="AR" term="%22Díaz‐Barrera%2C+Alvaro%22">Díaz‐Barrera, Alvaro</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Andler%2C+Rodrigo%22">Andler, Rodrigo</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Martínez%2C+Irene%22">Martínez, Irene</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Peña%2C+Carlos%22">Peña, Carlos</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Chemical+Technology+%26+Biotechnology%22">Journal of Chemical Technology & Biotechnology</searchLink>. Apr2016, Vol. 91 Issue 4, p1063-1071. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Poly-beta-hydroxybutyrate%22">Poly-beta-hydroxybutyrate</searchLink><br /><searchLink fieldCode="DE" term="%22Azotobacter+vinelandii%22">Azotobacter vinelandii</searchLink><br /><searchLink fieldCode="DE" term="%22Physiological+transport+of+oxygen%22">Physiological transport of oxygen</searchLink><br /><searchLink fieldCode="DE" term="%22Oxygen+evolution+reactions%22">Oxygen evolution reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Biodegradation%22">Biodegradation</searchLink><br /><searchLink fieldCode="DE" term="%22Polymers%22">Polymers</searchLink><br /><searchLink fieldCode="DE" term="%22Bacterial+cultures%22">Bacterial cultures</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: BACKGROUND Poly-3-hydroxybutyrate ( PHB) is a polyester that can be accumulated by Azotobacter vinelandii. This polymer is a biodegradable thermoplastic material used for producing plastics for packaging, biobased films, and biocompatible implants. RESULTS PHB produced by wild-type A. vinelandii and a mutant OP strain were evaluated at different agitation rates. The oxygen transfer rate ( OTR) evolution was characterized in cultures grown at 300, 400, 500 and 600 rpm, showing for the first time the OTR evolution in cultures of mutant OP. Under the conditions evaluated, the cultures were limited by oxygen. In the cultures grown with the OP strain, lower OTR and specific oxygen uptake rate were obtained, indicating a lower necessity for oxygen for growth in this mutant. A higher amount of PHB can be produced by decreasing the OTR. A maximum PHB of 79% on dry weight was observed in the cultures with the wild-type strain, whereas the highest PHB productivity (0.18 g L−1 h−1) was obtained in cultures of A. vinelandii OP conducted at 600 rpm. CONCLUSION The amount of PHB produced during the period of oxygen limitation can be controlled by the OTR, opening the possibility to evaluate this parameter as a criterion for scaling-up PHB production by A. vinelandii. © 2015 Society of Chemical Industry [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Chemical Technology & Biotechnology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1002/jctb.4684
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      – Code: eng
        Text: English
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        PageCount: 9
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      – SubjectFull: Poly-beta-hydroxybutyrate
        Type: general
      – SubjectFull: Azotobacter vinelandii
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      – SubjectFull: Physiological transport of oxygen
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      – SubjectFull: Oxygen evolution reactions
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      – SubjectFull: Biodegradation
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      – SubjectFull: Polymers
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      – SubjectFull: Bacterial cultures
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      – TitleFull: Poly-3-hydroxybutyrate production by Azotobacter vinelandii strains in batch cultures at different oxygen transfer rates.
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            NameFull: Díaz‐Barrera, Alvaro
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            NameFull: Andler, Rodrigo
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            NameFull: Martínez, Irene
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            NameFull: Peña, Carlos
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              Text: Apr2016
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              Y: 2016
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