Evaluation of the drying process in spouted bed and spout fluidized bed of xanthan gum: focus on product quality

dc.creatorCunha, RL
dc.creatorMaialle, KG
dc.creatorMenegalli, FC
dc.date2000
dc.dateFEB 1
dc.date2014-12-02T16:28:45Z
dc.date2015-11-26T16:37:50Z
dc.date2014-12-02T16:28:45Z
dc.date2015-11-26T16:37:50Z
dc.date.accessioned2018-03-28T23:21:01Z
dc.date.available2018-03-28T23:21:01Z
dc.identifierPowder Technology. Elsevier Science Sa, v. 107, n. 3, n. 234, n. 242, 2000.
dc.identifier0032-5910
dc.identifierWOS:000085338700005
dc.identifier10.1016/S0032-5910(99)00197-7
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/65963
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/65963
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/65963
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1272128
dc.descriptionIt has been shown that spouted bed (SB) dryers are an alternative way to obtain high quality dried powder products. Xanthan is a biopolymer, which gives highly elastic dispersions, while at the same time exhibiting great pseudoplasticity. This hydrocolloid is widely used as a stabilizer: thickener or as gelling agent when associated to other gums. In this work, the drying of xanthan gum in two-dimensional SE, and in a two-dimensional spouted bed with additional aeration (SFB) was evaluated. The product quality was studied as a function of the gum dispersability, and of the rheological properties under steady and dynamic shear. The dried gum dispersed in water shows a similar rheological behavior to the dispersion of commercial xanthan, i.e., significant break-up of the gum structure does not occur even if the biopolymer has undergone shear drying conditions. Turbidimetric measurements were done in order to quantify the dispersability of powder materials. A light microscopic analysis has shown that the material obtained via SFB acquires a shape of large agglomerates with spins, while the commercial powder exhibits an ellipsoid shape. The SE drying process yields a material with an intermediate shape. Such results were associated to the dispersability with the powdered gum. (C) 2000 Elsevier Science S.A. All rights reserved.
dc.description107
dc.description3
dc.description234
dc.description242
dc.languageen
dc.publisherElsevier Science Sa
dc.publisherLausanne
dc.publisherSuíça
dc.relationPowder Technology
dc.relationPowder Technol.
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectrheology
dc.subjectdispersions
dc.subjectmicrostructure
dc.subjectDryer
dc.titleEvaluation of the drying process in spouted bed and spout fluidized bed of xanthan gum: focus on product quality
dc.typeArtículos de revistas


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