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FP5

MODSTEEL Informe resumido

Project ID: G5RD-CT-1999-00066
Financiado con arreglo a: FP5-GROWTH
País: Portugal

Food industry and surface tension of stainless steel

This part of the project analysed the relationships between the basic component of the surface tension (gamma) of stainless steel and:
- The build up of calcium phosphate deposits in the presence and in the absence of citrates;

- The initial adhesion of whey proteins,

- The build up of calcium phosphate/protein deposits.

The different stainless steel surfaces were characterized by the sessile drop method (measurements of contact angles formed by three appropriate liquids on the surfaces).

It was found that the basic part of the Lewis acid-base component (gamma) could be related to the deposition features of calcium phosphate under several morphological phases, with and without whey proteins.

The specific conclusions related to the influence of the surface on the deposition process were:
- SMUF deposition without whey protein:
-- The initial deposition rate of calcium phosphate as well as its easiness of removal decrease as gamma increases (the highest gamma corresponds to SiOx PECVD and ion implanted surfaces; the lower value of this component corresponds to the Ni-PTFE and silica coated surfaces);

-- The final amount and density of the deposit increases with the increase in gamma;

- SMUF deposition with whey protein and whey proteins alone:
-- For higher temperatures, the amount of deposit formed decreases as gamma increases (the highest gamma corresponds to SiOx PECVD and ion implanted surfaces; the lower value of this component corresponds to the Ni-PTFE and silica coated surfaces).

-- For deposition at lower temperatures, the dependence on the surfaces is similar to the one found for the deposition of calcium phosphate alone.

- SMUF deposition without citrate:
-- The amount of deposit formed increased with the increase of gamma- (the highest gamma corresponds to SiOx PECVD and ion implanted surfaces; the lower value of this component corresponds to the Ni-PTFE and silica coated surfaces).

Información relacionada

Contacto

Luis F. MELO, (Professor)
Tel.: +351-225081588
Fax: +351-225081449
Correo electrónico
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