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Role of the caffeic acid oxidation products on the iron mobilization at the soil-root interface

Deiana, Salvatore Andrea and Gessa, Carlo Emanuele and Pilo, Maria Itria and Premoli, Alessandra Maria and Solinas, Vincenzo (1995) Role of the caffeic acid oxidation products on the iron mobilization at the soil-root interface. Giornale botanico italiano, Vol. 129 (4), p. 941-942. ISSN 0017-0070. Article.

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Abstract

Previous results show that the reduction of Fe(III) by caffeiic acid (CAF) is strongly influenced by the pH of the reaction medium (DEIANA et al., 1995). In particular, it has been found that al pH > 3.8 the reducing activity of CAF towards the Fe(III) ions in solution is low, but it increases when Fe(III) is complexed as Fe(III)-polygalacturonate. The mobilization of the Fe(II) ions, which form upon the Fe(III) reduction, has been shown to depend mainly on the nature of the Fe(III)-polygalacturonate complexes (DEIANA et al., 1994a). In particular, it bas been observed a high redox activity of CAF towards Fe(III) when the metal ion is coordinated by the carboxilic groups of the macromolecule. The Fe(III) reduction has been found to decrease when an oxydrilic group was inserted in the Fe(III) coordination sphere. The Fe(II) produced partly diffuses into the external solution and partly is still strongly held by the polysaccharidic matrix. The oxidation of CAF by Fe(III) gives rise to the formation of products (OP) with different polymerization degree, some of which are similar to those found in natural systems (DEIANA et al., 1994b). In order to determine the role of these products in the Fe(III) reduction as well as in the mobilization of the Fe(II) produced it was set up an electrochemical method to synthetize these products (DEIANA et al., 1994b). Here are reported some results about the interaction which establish between the CAF oxidation products and iron in both oxidized and reduced form.

Item Type:Article
ID Code:7818
Status:Published
Refereed:Yes
Uncontrolled Keywords:Caffeic acid, iron mobilization, soil-root interface
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/13 Chimica agraria
Area 03 - Scienze chimiche > CHIM/01 Chimica analitica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
001 Università di Sassari > 01 Dipartimenti > Scienze ambientali agrarie e biotecnologie agro-alimentari
Publisher:Società botanica italiana
ISSN:0017-0070
Publisher Policy:Depositato per gentile concessione dell'Editore
Additional Information:Comunicazione presentata al 35° Congresso della Società Italiana di Fisiologia Vegetale, Orvieto, 27-29 settembre 1995.
Deposited On:24 Jul 2012 12:27

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