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Influence of organic acids exuded by plants on the interaction of copper with the polysaccharidic components of the rootmucilages

Deiana, Salvatore Andrea and Gessa, Carlo Emanuele and Palma, Amedeo and Premoli, Alessandra Maria and Senette, Caterina (2003) Influence of organic acids exuded by plants on the interaction of copper with the polysaccharidic components of the rootmucilages. Organic Geochemistry, Vol. 34 (5), p. 651-660. eISSN 1873-5290. Article.

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DOI: 10.1016/S0146-6380(03)00020-2

Abstract

A model of the soil-root interface defined by a network of Ca-polygalacturonate was employed to draw information about the interactions between copper and the polysaccharidiccomponents of the rootmucilages. The absorption kinetics show that the matrix has a high affinity and selectivity towards copper and that two carboxylate groups coordinate one metal ion. The complexing activity of the polysaccharidic matrix towards copper was also investigated in the presence of citric, malic, pyruvic, and d-galacturonic acids. The results show that the capacity of the matrix to complex copper is related to the organicacid used, which can be explained on the basis of both the stability constants and concentration of the complexes in solution. The ability of these acids to mobilize copper from the polysaccharidic matrix was also investigated.

Item Type:Article
ID Code:7510
Status:Published
Refereed:Yes
Uncontrolled Keywords:Copper, reaction kinetics, organic acids, polysaccharides, absorption
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/13 Chimica agraria
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > CNR-Consiglio Nazionale delle Ricerche > Istituto di scienze delle produzioni alimentari, Sassari
001 Università di Sassari > 01 Dipartimenti > Scienze ambientali agrarie e biotecnologie agro-alimentari
Publisher:Pergamon
eISSN:1873-5290
Deposited On:08 May 2012 13:41

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