Ion exchange as post-fermentative process enhancer of viscosity of xanthan produced by Xanthomonas arboricola pv pruni
2016
Klaic, Paula Michele Abentroth | Vendruscolo, Claire Tondo | Furlan, Lígia | Moreira, Angelita da Silveira
A very simple post-fermentative process that resulted in xanthans with differentiated rheological properties was proposed. Xanthans produced by Xanthomonas arboricola pv pruni under pH 7 and pH 9 were modified by an ion exchange post-fermentative process. Increasing amounts of Na+ (0.5–15% w/w relative to xanthan content) and Ca2+ (0.5–10% w/w) were added to the xanthan salt free solutions. Prior to recovery, no variation in viscosity was observed for xanthan produced at pH 7, while there was a slight variation for xanthan produced at pH 9. After recovering, the improvements to xanthan viscosity were verified. The post-fermentative process developed in the current study enhanced the viscosifier capacity of xanthan pruni, which was already excellent, approximately 2–7 fold, and was mainly due to the addition of 5% of Na+ and 0.5% of Ca2+. The ion exchange resulted in improved xanthans with potentially diverse applications.
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