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Formation of biopolymers owing to the oxidation of esculetine by Cu(II) ions in a Ca-polygalacturonate network

Castaldi, Paola and Garau, Giovanni and Palma, Amedeo and Deiana, Salvatore Andrea (2012) Formation of biopolymers owing to the oxidation of esculetine by Cu(II) ions in a Ca-polygalacturonate network. Journal of Inorganic Biochemistry, Vol. 108 , p. 30-35. eISSN 1873-3344. Article.

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DOI: 10.1016/j.jinorgbio.2011.10.015


Pectic acids participate in the transport of heavy metal ions in the root apoplasm by establishing interactions that can lead to their partial or total immobilization. The ions accumulated can be mobilized by phenolic compounds and organic acids of the root exudates. In this context, we tested, in aqueous phase, the ability of malic acid and esculetine (ESC) to mobilize the Cu(II) ions accumulated in a Ca-polygalacturonate matrix (Ca-PGA) used as a model of the root apoplasm. The results show that at pH 5.0 and 6.0 malic acid mobilizes about 22% and 34% of the Cu(II) accumulated, respectively, whereas ESC about 12% and 25%. ESC was found to cause the reduction of Cu(II) to Cu(I) with formation of ESC oxidation products. The study of the Cu(II)-ESC binary system evidenced that one molecule of ESC reduces one Cu(II) ion with formation of semiquinonic radicals that couple to form two dimers. The Cu(II) reduction by ESC was found faster in the presence of malic acid.

Item Type:Article
ID Code:7050
Uncontrolled Keywords:Polygalacturonic acid, esculetine, malic acid, copper, soil–root interface, root apoplasm
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-a Nuovi Dipartimenti dal 2012 > Agraria
Publisher:Elsevier Science
Deposited On:11 Apr 2012 09:49

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