Show simple item record

dc.contributor.authorHezayen, FF
dc.contributor.authorRehm, BHA
dc.contributor.authorEberhardt, R
dc.contributor.authorSteinbuchel, A
dc.date.accessioned2018-04-20T04:04:34Z
dc.date.available2018-04-20T04:04:34Z
dc.date.issued2000
dc.identifier.issn0175-7598
dc.identifier.doi10.1007/s002530000394
dc.identifier.urihttp://hdl.handle.net/10072/373507
dc.description.abstractA novel corrosion-resistant bioreactor composed of polyetherether ketone (PEEK), tech glass and silicium nitrite ceramics was constructed and applied for the cultivation of two newly isolated, extremely halophilic archaea producing poly(γ-glutamic acid) (PGA), or poly(β-hydroxy butyric acid) (PHB), respectively. These bacteria were isolated from hypersaline soil close to Aswan (Egypt). The isolate strain 40, which is related to the genus Natrialba, produced large amounts of PGA when cultivated on solid medium. Culture conditions were optimised applying the corrosion-resistant bioreactor. PGA production was dependent on NaCl concentration and occurred about at 20% (w/v) NaCl in the medium. A maximum cell density of about 1.6 g cell dry matter/l was obtained when the bioreactor was stirred and aerated in a batch fermentation process using proteose-peptone medium. The supernatant was monitored with respect to PGA formation, and after 90 h a maximum of 470 mg/l culture volume was detected by HPLC analysis. Culture conditions were optimized for the isolate 56, which accumulated PHB as intracellular granules. Batch fermentations in the stirred and aerated bioreactor applying acetate and n-butyric acid as carbon sources led to cell density of 2.28 g cell dry matter/l and a maximum PHB accumulation contributing to about 53% of cellular dry weight. About 4.6 g PHB were isolated from 10.6 g dried cells of strain 56, which exhibited a weight average molar mass of 2.3 × 105 g mol−1 and a polydispersity of about 1.4.
dc.description.peerreviewedYes
dc.languageEnglish
dc.publisherSpringer
dc.relation.ispartofpagefrom319
dc.relation.ispartofpageto325
dc.relation.ispartofissue3
dc.relation.ispartofjournalApplied Microbiology and Biotechnology
dc.relation.ispartofvolume54
dc.subject.fieldofresearchMicrobiology not elsewhere classified
dc.subject.fieldofresearchcode060599
dc.titlePolymer production by two newly isolated extremely halophilic archaea: Application of a novel corrosion-resistant bioreactor
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.hasfulltextNo Full Text
gro.griffith.authorRehm, Bernd


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

  • Journal articles
    Contains articles published by Griffith authors in scholarly journals.

Show simple item record