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Author(s): Roxane Rosmaninho
Luis F. Melo
Title: The effect of citrate on calcium phosphate deposition from Simulated Milk Ultrafiltrate (SMUF) solution
Issue Date: 2006
Abstract: As has been widely reported, different calcium phosphate phases can be formed in solution depending on several physical-chemicalaspects like the concentration of free calcium and phosphate ions, pH of the solution, temperature and the presence of interferingions. The present work aims at studying the effect of pH and of citrates on the precipitation of calcium phosphate in asolution that simulates the mineral composition of milk (SMUF), as well as the subsequent effect on the deposition on stainless steelsurfaces. The different calcium phosphate species formed during heating at different pH values and in the presence or absence ofcitrate were characterized by scanning electron microscopy, X-ray microanalysis and X-ray diffraction. Their fouling behaviourwas characterized according to the amount of deposit formed on stainless steel surfaces and to the deposits resistance to removalby hydrodynamic shear forces. The absence of citrate was responsible for the decrease in the solution pH and for the formation of acrystalline dicalcium phosphate dihydrate structure with a deposited mass which was almost twice the one obtained in the presenceof citrate.
Subject: Ciências Tecnológicas
Technological sciences
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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