Chitosan as flocculant agent for clarification of stevia extract

Chitosan as flocculant agent for clarification of stevia extract

Author Oliveira, Silvia P. D. de Google Scholar
Mahl, Cynthia Regina Albrecht Google Scholar
Simões, Márcia R. Google Scholar
Silva, Classius Ferreira da Autor UNIFESP Google Scholar
Institution UNIOESTE Centro de Engenharias e Ciências Exatas
Universidade Federal de São Paulo (UNIFESP)
Abstract Stevia is used as a sweetener due to its low calorific value and its taste, which is very similar to that of sucrose. After extraction from dried leaves, stevia extract is dark in colour, and therefore needs to be whitened to increase acceptance by consumers. In this study we tested chitosan, a cationic polyelectrolyte, as flocculant agent for the whitening of the Stevia extract. Positive charges of chitosan can interact electrostatically with a counter-ion, sodium tripolyphosphate (TPP), and then chitosan precipitates. A factorial design was used to study the whitening process, in which Glycosides Removal, Colour Removal, Turbidity Removal and Soluble Solids Removal were evaluated. The studied factors were Chitosan Mass and pH of the TPP solution. The results showed that chitosan is a good flocculant agent, being able to flocculate both the glycosides and the pigments that make the extract coloured.
Keywords Stevia
sweeteners
chitosan
flocculation
clarification
Language English
Date 2012-01-01
Published in Polímeros. Associação Brasileira de Polímeros, v. 22, n. 4, p. 401-406, 2012.
ISSN 0104-1428 (Sherpa/Romeo, impact factor)
Publisher Associação Brasileira de Polímeros
Extent 401-406
Origin http://dx.doi.org/10.1590/S0104-14282012005000066
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000313083600016
SciELO ID S0104-14282012000400016 (statistics in SciELO)
URI http://repositorio.unifesp.br/handle/11600/6886

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