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dc.contributor.CRUESPUNIVERSIDADE DE ESTADUAL DE CAMPINASpt_BR
dc.typeresearch-articlept_BR
dc.titleStructure of xanthan gum and cell ultrastructure at different times of alkali stresspt_BR
dc.title.alternativeen
dc.contributor.authorLuvielmopt_BR
dc.contributor.authorMárcia de Mello; Borgespt_BR
dc.contributor.authorCaroline Dellinghausen; Toyamapt_BR
dc.contributor.authorDaniela de Oliveira; Vendruscolopt_BR
dc.contributor.authorClaire Tondo; Scamparinipt_BR
dc.contributor.authorAdilma Regina Pippapt_BR
unicamp.authorScamparini, Adilma Regina Pippa] Universidade Estadual de Campinas, Brazilpt_BR
unicamp.author.external[Vendruscolo, Claire Tondo] Universidade Federal de Pelotas, Brazilpt
unicamp.author.external[Toyama, Daniela de Oliveirapt
unicamp.author.external[Borges, Caroline Dellinghausen] Universidade Federal de Pelotas, Brazilpt
unicamp.author.external[Luvielmo, Márcia de Mello] Federal University of Rio Grande, Brazilpt
dc.description.abstractThe effect of alkali stress on the yield, viscosity, gum structure, and cell ultrastructure of xanthan gum was evaluated at the end of fermentation process of xanthan production by Xanthomonas campestris pv. manihotis 280-95. Although greater xanthan production was observed after a 24 h-alkali stress process, a lower viscosity was observed when compared to the alkali stress-free gum, regardless of the alkali stress time. However, this outcome is not conclusive as further studies on gum purification are required to remove excess sodium, verify the efficiency loss and the consequent increase in the polymer viscosity. Alkali stress altered the structure of xanthan gum from a polygon-like shape to a star-like form. At the end of the fermentation, early structural changes in the bacterium were observed. After alkali stress, marked structural differences were observed in the cells. A more vacuolated cytoplasm and discontinuities in the membrane cells evidenced the cell lysis. Xanthan was observed in the form of concentric circles instead of agglomerates as observed prior to the alkali stress.en
dc.description.abstractpt
dc.relation.ispartofBrazilian Journal of Microbiologypt_BR
dc.relation.ispartofBrazilian Journal of Microbiologypt_BR
dc.date.issued2016pt_BR
dc.identifier.citationBrazilian Journal Of Microbiology, 47, 1, p.102-. 2016.pt_BR
dc.language.isoEnglishpt_BR
dc.description.volume47pt_BR
dc.description.issuenumber1pt_BR
dc.description.firstpage102pt_BR
dc.description.lastpage109pt_BR
dc.rightsabertopt_BR
dc.sourceSciELOpt_BR
dc.identifier.issn1678-4405pt_BR
dc.identifier.idScieloS1517-83822016000100102pt_BR
dc.identifier.doi10.1016/j.bjm.2015.11.006pt_BR
dc.identifier.urlhttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000100102pt_BR
dc.date.available2016-11-10T19:22:49Z-
dc.date.accessioned2016-11-10T19:22:49Z-
dc.description.provenanceMade available in DSpace on 2016-11-10T19:22:49Z (GMT). No. of bitstreams: 1 S1517-83822016000100102.pdf: 3165607 bytes, checksum: 7ba585a3a3befd0f200db3de8a246e06 (MD5) Previous issue date: 2016en
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/318961-
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