Effect of pH on the Clarification of Bertoni Extract Using Alginate Beads

Stevia rebaudiana Bertoni is plant used for producing a natural sweetener. After extraction from leaves, stevia extract is dark in colour and must be clarified for better acceptance by consumers. Adsorption processes are widely employed in the clarification because they do not use organic solvents....

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Main Authors:	Cynthia R.A. Mahl, Silvia P.D. de Oliveira, Bruna B. da Silva, Gabriela da Igreja, Márcia R. Simões, Classius F. da Silva
Format:	Article
Language:	English
Published:	Hindawi - SAGE Publishing 2010-02-01
Series:	Adsorption Science & Technology
Online Access:	https://doi.org/10.1260/0263-6174.28.2.189

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spelling	doaj-7dfc74b0c5524f759329bf66aefb4cf32021-04-02T10:56:16ZengHindawi - SAGE PublishingAdsorption Science & Technology0263-61742048-40382010-02-012810.1260/0263-6174.28.2.189Effect of pH on the Clarification of Bertoni Extract Using Alginate BeadsCynthia R.A. Mahl0Silvia P.D. de Oliveira1Bruna B. da SilvaGabriela da Igreja2Márcia R. Simões3Classius F. da Silva4 Universidade Estadual do Oeste do Paraná, Rua da Faculdade, 2550, Toledo, Paraná, 85903-000, Brazil Universidade Estadual do Oeste do Paraná, Rua da Faculdade, 2550, Toledo, Paraná, 85903-000, Brazil Universidade Estadual do Oeste do Paraná, Rua da Faculdade, 2550, Toledo, Paraná, 85903-000, Brazil Universidade Estadual do Oeste do Paraná, Rua da Faculdade, 2550, Toledo, Paraná, 85903-000, Brazil Universidade Federal de São Paulo, Rua Professor Artur Riedel, 275, Diadema, São Paulo, 09972-270, BrazilStevia rebaudiana Bertoni is plant used for producing a natural sweetener. After extraction from leaves, stevia extract is dark in colour and must be clarified for better acceptance by consumers. Adsorption processes are widely employed in the clarification because they do not use organic solvents. In the present work, the use of alginate beads as an adsorbent was investigated. Experiments were carried out in a batch system in which the aqueous stevia extract was mixed with the alginate beads previously prepared by ionotropic gelation. The effect of pH on the adsorption process was evaluated and the performance of the beads was examined by colorimetric analysis (colour removal, turbidity removal and adsorption of stevia steviol glycosides), as well as by refractive analysis for determining the adsorption of soluble solids. The results showed that the alginate beads were capable of adsorbing both the stevia steviol glycosides and the pigments that colour the extract. The best results were observed at a pH value of 2.0.https://doi.org/10.1260/0263-6174.28.2.189
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Cynthia R.A. Mahl Silvia P.D. de Oliveira Bruna B. da Silva Gabriela da Igreja Márcia R. Simões Classius F. da Silva
spellingShingle	Cynthia R.A. Mahl Silvia P.D. de Oliveira Bruna B. da Silva Gabriela da Igreja Márcia R. Simões Classius F. da Silva Effect of pH on the Clarification of Bertoni Extract Using Alginate Beads Adsorption Science & Technology
author_facet	Cynthia R.A. Mahl Silvia P.D. de Oliveira Bruna B. da Silva Gabriela da Igreja Márcia R. Simões Classius F. da Silva
author_sort	Cynthia R.A. Mahl
title	Effect of pH on the Clarification of Bertoni Extract Using Alginate Beads
title_short	Effect of pH on the Clarification of Bertoni Extract Using Alginate Beads
title_full	Effect of pH on the Clarification of Bertoni Extract Using Alginate Beads
title_fullStr	Effect of pH on the Clarification of Bertoni Extract Using Alginate Beads
title_full_unstemmed	Effect of pH on the Clarification of Bertoni Extract Using Alginate Beads
title_sort	effect of ph on the clarification of bertoni extract using alginate beads
publisher	Hindawi - SAGE Publishing
series	Adsorption Science & Technology
issn	0263-6174 2048-4038
publishDate	2010-02-01
description	Stevia rebaudiana Bertoni is plant used for producing a natural sweetener. After extraction from leaves, stevia extract is dark in colour and must be clarified for better acceptance by consumers. Adsorption processes are widely employed in the clarification because they do not use organic solvents. In the present work, the use of alginate beads as an adsorbent was investigated. Experiments were carried out in a batch system in which the aqueous stevia extract was mixed with the alginate beads previously prepared by ionotropic gelation. The effect of pH on the adsorption process was evaluated and the performance of the beads was examined by colorimetric analysis (colour removal, turbidity removal and adsorption of stevia steviol glycosides), as well as by refractive analysis for determining the adsorption of soluble solids. The results showed that the alginate beads were capable of adsorbing both the stevia steviol glycosides and the pigments that colour the extract. The best results were observed at a pH value of 2.0.
url	https://doi.org/10.1260/0263-6174.28.2.189
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Effect of pH on the Clarification of Bertoni Extract Using Alginate Beads

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