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A Natural Clay Organic Complex from Andalusian Black Earth

Published online by Cambridge University Press:  01 July 2024

J. L. Perez Rodriguez
Affiliation:
Centro de Edafologia y Biologia Aplicada de Cuarto, Bellavista, Spain
Armin Weiss
Affiliation:
Institut für Anorganische Chemie der Universität München, München, Germany
Gerhard Lagaly*
Affiliation:
Institut für Anorganische Chemie der Universität Kiel, Kiel, Germany
*
*Requests for reprints to: Prof. Dr. Gerhard Lagaly, Institut für Anorganische Chemie der Universität Kiel, Olshausenstraße 40/60, 23, Kiel, Germany

Abstract

Protein complexes of smectites in soils are difficult to detect if the usual smectite tests show no peculiarities. Andalusian black earths are typical examples. Investigation of the alkylam-monium derivatives, however, allows detection of adhered macromolecules which might be protein-like although this cannot be proved exactly.

Investigation of artificial clay-protein complexes reveals different types of clay protein interactions. Calcium smectites adsorb proteins mainly on the external surfaces, the macromolecules being anchored in the interlayer spaces. Sodium smectites give partial crystalline products in which the silicate layers are distributed in the protein matrix.

Exchange of alkylammonium ions can be used as a tool for detection of the protein. If this is adsorbed on external surfaces (calcium smectites) the increased layer separation during the cation exchange enables the macromolecules to slip between the layers and the basal spacing of the alkylammonium derivatives are changed in characteristic ways. The partial crystalline sodium clay-protein complexes are reorganized by alkylammonium ions to regular structures. The proteins are not displaced completely from the silicate surfaces so that the basal spacing of the alkylammonium derivatives are enhanced in comparison with pure montmorillonite.

Type
Research Article
Copyright
Copyright © Clay Minerals Society 1977

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