Parameters afecting the conversion of alginic acid to sodium alginate

Parameters afecting the conversion of alginic acid to sodium alginate

The step to convert alginic acid to sodium alginate on the alginate extraction process was studied, using the brown seaweed Macrocystis pyrifera as raw material. The effect of alcohol volume, alcohol-water proportion, pH, and treatment time on the yield and viscosity of the alginate obtained was ana...

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Autores principales: Arvizu-Higuera, DL, Hernández-Carmona, G, Rodríguez-Montesinos, YE
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2002
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/208
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spelling oai:cienciasmarinas.com.mx:article-2082019-05-02T19:57:08Z Parameters afecting the conversion of alginic acid to sodium alginate Parámetros que afectan la conversión del ácido algínico en alginato de sodio Arvizu-Higuera, DL Hernández-Carmona, G Rodríguez-Montesinos, YE Macrocystis pyrifera alginic acid alginate conversion viscosity Macrocystis pyrifera ácido algínico alginato conversión viscosidad The step to convert alginic acid to sodium alginate on the alginate extraction process was studied, using the brown seaweed Macrocystis pyrifera as raw material. The effect of alcohol volume, alcohol-water proportion, pH, and treatment time on the yield and viscosity of the alginate obtained was analyzed. Seven volumes of the mixture alcohol-water in proportion 50:50 were experimented, from 9 to 15 mL g–1 alga. The yield and viscosity were not significantly different in any of the volumes used, however, the stirring with the volume of 9 mL g–1 alga was less efficient, therefore the minimum volume to use in this step was 10 mL g–1 alga. The appropriated proportion of the mixture alcohol-water was determined using five proportions: 50:50, 47:53, 44:56, 40:60, and 37:63. The highest yield and viscosity were obtained using the proportion 50:50. Five pH values from 6 to 10 were experimented to determine the optimum pH for the conversion reaction. The best results were obtained using a pH from 7 to 8 in the alcoholic solution of the conversion step. To determine the minimum time required for the conversion reaction, the fibers of sodium alginate were stirred in an alcoholic solution for 20, 30, 40, 50 and 60 min. The yield and viscosity obtained were not significantly different, therefore, the minimum time to carry out the conversion reaction was 30 minutes to assure a complete reaction. The use of a double planetary mixer is proposed to carry out this step at other level. Se estudió la etapa de conversión de ácido algínico a alginato de sodio, en el proceso de producción de alginatos, a partir del alga café Macrocystis pyrifera, como materia prima. Se determinó el efecto del volumen de alcohol, la proporción de alcoholagua, el pH y el tiempo de tratamiento sobre el rendimiento y la viscosidad del alginato obtenido. Se experimentaron siete volúmenes de la mezcla alcohol-agua en proporción 50:50, de 9 a 15 mL g–1 de alga. El rendimiento y la viscosidad no fueron significativamente diferentes en ninguno de los volúmenes empleados, sin embargo, con el volumen de 9 mL g–1 de alga, la agitación no fue eficiente, por lo tanto el volumen mínimo a emplear en esta etapa fue de 10 mL g–1 de alga. La proporción apropiada de la mezcla alcohol-agua se determinó usando cinco proporciones: 50:50, 47:53, 44:56, 40:60 y 37:63. El mayor rendimiento y viscosidad se obtuvieron con la proporción 50:50. Se probaron cinco valores de pH de 6 hasta 10 para determinar el pH óptimo de la reacción de conversión. Los mejores resultados se obtuvieron utilizando un pH de 7 a 8 en la solución alcohólica de la etapa de conversión. Para determinar el tiempo mínimo requerido para la reacción de conversión, las fibras de alginato de sodio se mantuvieron en agitación en una solución alcohólica durante diferentes tiempos: 20, 30, 40, 50 y 60 minutos. El rendimiento y la viscosidad obtenidos no presentaron diferencias significativas, por lo tanto, el tiempo mínimo para llevar a cabo la reacción de conversión fue de 30 minutos, para asegurar una reacción completa. Se propone el uso de un mezclador doble planetario para llevar a cabo esta etapa a otro nivel. Iniversidad Autónoma de Baja California 2002-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/208 10.7773/cm.v28i1.208 Ciencias Marinas; Vol. 28 No. 1 (2002); 27-36 Ciencias Marinas; Vol. 28 Núm. 1 (2002); 27-36 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/208/175
institution Ciencias Marinas
collection OJS
language eng
format Online
author Arvizu-Higuera, DL
Hernández-Carmona, G
Rodríguez-Montesinos, YE
spellingShingle Arvizu-Higuera, DL
Hernández-Carmona, G
Rodríguez-Montesinos, YE
Parameters afecting the conversion of alginic acid to sodium alginate
author_facet Arvizu-Higuera, DL
Hernández-Carmona, G
Rodríguez-Montesinos, YE
author_sort Arvizu-Higuera, DL
title Parameters afecting the conversion of alginic acid to sodium alginate
title_short Parameters afecting the conversion of alginic acid to sodium alginate
title_full Parameters afecting the conversion of alginic acid to sodium alginate
title_fullStr Parameters afecting the conversion of alginic acid to sodium alginate
title_full_unstemmed Parameters afecting the conversion of alginic acid to sodium alginate
title_sort parameters afecting the conversion of alginic acid to sodium alginate
description The step to convert alginic acid to sodium alginate on the alginate extraction process was studied, using the brown seaweed Macrocystis pyrifera as raw material. The effect of alcohol volume, alcohol-water proportion, pH, and treatment time on the yield and viscosity of the alginate obtained was analyzed. Seven volumes of the mixture alcohol-water in proportion 50:50 were experimented, from 9 to 15 mL g–1 alga. The yield and viscosity were not significantly different in any of the volumes used, however, the stirring with the volume of 9 mL g–1 alga was less efficient, therefore the minimum volume to use in this step was 10 mL g–1 alga. The appropriated proportion of the mixture alcohol-water was determined using five proportions: 50:50, 47:53, 44:56, 40:60, and 37:63. The highest yield and viscosity were obtained using the proportion 50:50. Five pH values from 6 to 10 were experimented to determine the optimum pH for the conversion reaction. The best results were obtained using a pH from 7 to 8 in the alcoholic solution of the conversion step. To determine the minimum time required for the conversion reaction, the fibers of sodium alginate were stirred in an alcoholic solution for 20, 30, 40, 50 and 60 min. The yield and viscosity obtained were not significantly different, therefore, the minimum time to carry out the conversion reaction was 30 minutes to assure a complete reaction. The use of a double planetary mixer is proposed to carry out this step at other level.
publisher Iniversidad Autónoma de Baja California
publishDate 2002
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/208
_version_ 1715723942359990272

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