Clarification of <em>Stevia rebaudiana</em> (Bert.) Bertoni extract by adsorption in modified zeolites

Authors

  • Elida de Paula Moraes UEM
  • Nádia Regina Camargo Fernandes Machado UEM

DOI:

https://doi.org/10.4025/actascitechnol.v23i0.2779

Keywords:

clarificação, Stevia rebaudiana (Bert.) Bertoni, zeólita CaX, adsorção seletiva

Abstract

Selective adsorption on zeolites X and A was studied with Stevia rebaudiana (Bert.) Bertoni (Asteraceae) extract clarification. Ionic exchanges were made with calcium and barium ions in zeolites NaX and NaA and the effect of contact of aqueous extract of dry Stevia rebaudiana Bertoni leaves with CaX, BaX, CaA and BaA zeolites was evaluated. Stevia extract in contact with the zeolite CaX showed highest clarification and did not present alterations of initial characteristics in concentration, glycosides and flavor. In batch tests at room temperature, the contact of Stevia aqueous extract and CaX zeolite provided 70-80% clarification. Since zeolite may be reused, an approximate clarification of 65-70% is possible in regenerated zeolite.

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Author Biography

Nádia Regina Camargo Fernandes Machado, UEM

Possui graduação em Engenharia Quí­mica pela Escola de Quí­mica da Universidade Federal do Rio de Janeiro (1978), mestrado em Engenharia Quí­mica (Catálise, Cinética e Reatores Quí­micos) pela COPPE/UFRJ (1983) e Doutorado em Eng. Quí­mica (CCRQ Reforma de Metanol) pela COPPE/UFRJ (1995). Exerce a função de professora no Departamento de Engenharia Quí­mica na Universidade Estadual de Maringá. Principais temas de pesquisa: produção de Hidrogênio pela reforma do etanol com vapor d água; Catálise Ambiental (fotocatálise) e Sí­ntese de Zeólitas com aplicações em catálise e purificação de efluentes por adsorção e troca iônica. Já orientou 52 trabalhos de Iniciação Cientí­fica, 15 dissertações de Mestrado e 5 teses de Doutorado. Publicou 27 artigos em revistas especializadas e 177 comunicações em eventos cientí­ficos Currí­culo Lattes

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Published

2008-05-05

How to Cite

Moraes, E. de P., & Machado, N. R. C. F. (2008). Clarification of <em>Stevia rebaudiana</em> (Bert.) Bertoni extract by adsorption in modified zeolites. Acta Scientiarum. Technology, 23, 1375–1380. https://doi.org/10.4025/actascitechnol.v23i0.2779

Issue

Vol. 23 (2001)

Section

Chemical Engineering

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