Cu and Zn accumulation by calcium alginate immobilized marine microalgal cells of Nannochloropsis gaditana (Eustigmatophyceae)

Cu and Zn accumulation by calcium alginate immobilized marine microalgal cells of Nannochloropsis gaditana (Eustigmatophyceae)

 Different experiments about the accumulation capacity for copper and zinc were carried out on the marine microalgae Nannochloropsis gaditana Lubián (Eustigmatophyceae). A 24-hour study of the evolution of accumulated metal in the beads revealed two possible accumulation phases. Accumulatio...

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Autores principales: Moreno-Garrido, I, Codd, GA, Gadd, GM, Lubián, LM
格式: Online
语言:eng
出版: Iniversidad Autónoma de Baja California 2002
在线阅读:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/203
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spelling oai:cienciasmarinas.com.mx:article-2032019-05-02T21:58:31Z Cu and Zn accumulation by calcium alginate immobilized marine microalgal cells of Nannochloropsis gaditana (Eustigmatophyceae) Acumulación de Cu y Zn por células microalgales marinas de Nannochloropsis gaditana (Eustigmatophyceae) inmovilizadas en alginato de calcio Moreno-Garrido, I Codd, GA Gadd, GM Lubián, LM Nannochloropsis heavy metal accumulation alginate Nannochloropsis acumulación de metales pesados alginato  Different experiments about the accumulation capacity for copper and zinc were carried out on the marine microalgae Nannochloropsis gaditana Lubián (Eustigmatophyceae). A 24-hour study of the evolution of accumulated metal in the beads revealed two possible accumulation phases. Accumulation differences between free and immobilized microalgal cells were investigated finding no differences for copper, and little differences for zinc. Free cells accumulated practically 100% Cu or Zn in the media under experimental conditions. Experiments in order to compare the accumulation capacity of living vs. dead cells were designed too, obtaining the largest accumulation levels for both metals in the beads containing immobilized living microalgae. In experiments carried out in continuous-flow reactors, beads with entrapped cells showed to be more efficient removing Cu and Zn than beads without cells. In all the experiments, the calcium alginate beads showed strong affinity for Cu. Similar results were obtained when accumulation by packed beads in columns was tested, but efficacy was higher if this design was used (beads with cells retain 80% of Cu introduced in the column). Se han realizado distintos experimentos sobre la capacidad de acumulación de cobre y zinc por parte de la microalga marina Nannochloropsis gaditana Lubián (Eustigmatophyceae). Un estudio de la evolución del metal acumulado durante 24 horas reveló la existencia de dos posibles fases de acumulación. Se investigaron las diferentes capacidades de acumulación de células microalgales libres e inmovilizadas, no encontrándose diferencias para el cobre y pequeñas diferencias para el zinc. Las células libres acumularon prácticamente el 100% del Cu o Zn presentes en el medio, en las condiciones experimentales. Se desarrollaron experimentos encaminados a determinar la capacidad de acumulación de estos metales por parte de algas inmovilizadas vivas frente a la de algas inmovilizadas muertas, encontrándose los niveles acumulativos más altos para ambos metales en las gotas de alginato que contenían algas vivas. En experimentos realizados en reactores de flujo continuo, las gotas de alginato con células inmovilizadas en su interior demostraron ser más eficientes en cuanto a la retirada de Cu y Zn del medio que las gotas sin algas. En todos los experimentos realizados se observa una fuerte afinidad del Cu por el alginato de calcio. Se obtuvieron resultados similares cuando se ensayó la acumulación de metales en gotas de alginato dispuestas en columnas llenas, aunque la eficacia fue mayor cuando se usó este último diseño (las gotas de alginato con células retuvieron el 80% del Cu introducido en la columna). 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/203 10.7773/cm.v28i1.203 Ciencias Marinas; Vol. 28 No. 1 (2002); 107-119 Ciencias Marinas; Vol. 28 Núm. 1 (2002); 107-119 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/203/170
institution Ciencias Marinas
collection OJS
language eng
format Online
author Moreno-Garrido, I
Codd, GA
Gadd, GM
Lubián, LM
spellingShingle Moreno-Garrido, I
Codd, GA
Gadd, GM
Lubián, LM
Cu and Zn accumulation by calcium alginate immobilized marine microalgal cells of Nannochloropsis gaditana (Eustigmatophyceae)
author_facet Moreno-Garrido, I
Codd, GA
Gadd, GM
Lubián, LM
author_sort Moreno-Garrido, I
title Cu and Zn accumulation by calcium alginate immobilized marine microalgal cells of Nannochloropsis gaditana (Eustigmatophyceae)
title_short Cu and Zn accumulation by calcium alginate immobilized marine microalgal cells of Nannochloropsis gaditana (Eustigmatophyceae)
title_full Cu and Zn accumulation by calcium alginate immobilized marine microalgal cells of Nannochloropsis gaditana (Eustigmatophyceae)
title_fullStr Cu and Zn accumulation by calcium alginate immobilized marine microalgal cells of Nannochloropsis gaditana (Eustigmatophyceae)
title_full_unstemmed Cu and Zn accumulation by calcium alginate immobilized marine microalgal cells of Nannochloropsis gaditana (Eustigmatophyceae)
title_sort cu and zn accumulation by calcium alginate immobilized marine microalgal cells of nannochloropsis gaditana (eustigmatophyceae)
description  Different experiments about the accumulation capacity for copper and zinc were carried out on the marine microalgae Nannochloropsis gaditana Lubián (Eustigmatophyceae). A 24-hour study of the evolution of accumulated metal in the beads revealed two possible accumulation phases. Accumulation differences between free and immobilized microalgal cells were investigated finding no differences for copper, and little differences for zinc. Free cells accumulated practically 100% Cu or Zn in the media under experimental conditions. Experiments in order to compare the accumulation capacity of living vs. dead cells were designed too, obtaining the largest accumulation levels for both metals in the beads containing immobilized living microalgae. In experiments carried out in continuous-flow reactors, beads with entrapped cells showed to be more efficient removing Cu and Zn than beads without cells. In all the experiments, the calcium alginate beads showed strong affinity for Cu. Similar results were obtained when accumulation by packed beads in columns was tested, but efficacy was higher if this design was used (beads with cells retain 80% of Cu introduced in the column).
publisher Iniversidad Autónoma de Baja California
publishDate 2002
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/203
_version_ 1715723941720358912

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