Structure and Fertilizer Properties of Byproducts Formed in the Synthesis of EDDHA

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• 作者：Lourdes Hern&aacute ; ndez-Apaolaza ; Sonia Garcí ; a-Marco ; Paloma Nadal ; Juan J. Lucena ; Miguel A. Sierra ; Mar Gó ; mez-Gallego ; Pedro Ramí ; rez-Ló ; pez ; and Rosa Escudero
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2006
• 出版时间：June 14, 2006
• 年：2006
• 卷：54
• 期：12
• 页码：4355 - 4363
• 全文大小：359K
• 年卷期：v.54,no.12(June 14, 2006)
• ISSN：1520-5118

文摘

The synthesis of commercial EDDHA produces o,o-EDDHA as the main reaction product, togetherwith a mixture of regioisomers (o,p-EDDHA and p,p-EDDHA) and other unknown byproducts alsoable to complex Fe³⁺. These compounds have been obtained by direct synthesis, and their structureshave been determined by ESI-MS analysis as oligomeric EDDHA-like products, formed bypolysubstitution in the phenolic rings. Short-term experiments show that the iron complexes of samplesenriched in these oligomeric byproducts have adequate stability in solution, but a significant amountof them is lost after interaction with soils and soil materials. Mildly chlorotic cucumber plants are ableto reduce iron better from o,p-EDDHA/Fe³⁺ than from the iron complexes of the oligomeric byproducts.In hydroponics, the chlorotic soybean susceptible plants have a lower potential for Fe absorptionfrom these byproducts than from o,o-EDDHA/Fe³⁺ and from o,p-EDDHA/Fe³⁺. In the studiedconditions, the iron chelates of EDDHA byproducts do not have the long-lasting effect shown byo,o-EDDHA/Fe³⁺ and present a less efficient fast-action effect than the o,p-EDDHA/Fe³⁺.Keywords: Iron chelates; fertilizers; o,o-EDDHA; o,p-EDDHA