Chitosan as flocculant agent for clarification of stevia extract

Chitosan as flocculant agent for clarification of stevia extract

Autor 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
Instituição UNIOESTE Centro de Engenharias e Ciências Exatas
Universidade Federal de São Paulo (UNIFESP)
Resumo 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.
Palavra-chave Stevia
sweeteners
chitosan
flocculation
clarification
Idioma Inglês
Data de publicação 2012-01-01
Publicado em Polímeros. Associação Brasileira de Polímeros, v. 22, n. 4, p. 401-406, 2012.
ISSN 0104-1428 (Sherpa/Romeo, fator de impacto)
Publicador Associação Brasileira de Polímeros
Extensão 401-406
Fonte http://dx.doi.org/10.1590/S0104-14282012005000066
Direito de acesso Acesso aberto Open Access
Tipo Artigo
Web of Science WOS:000313083600016
SciELO S0104-14282012000400016 (estatísticas na SciELO)
Endereço permanente http://repositorio.unifesp.br/handle/11600/6886

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