Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/318961
Type: research-article
Title: Structure of xanthan gum and cell ultrastructure at different times of alkali stress
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Author: Luvielmo
Márcia de Mello; Borges
Caroline Dellinghausen; Toyama
Daniela de Oliveira; Vendruscolo
Claire Tondo; Scamparini
Adilma Regina Pippa
Abstract: The 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.
Citation: Brazilian Journal Of Microbiology, 47, 1, p.102-. 2016.
Rights: aberto
Identifier DOI: 10.1016/j.bjm.2015.11.006
Address: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000100102
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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