Titre :

Toward the understanding of the interfacial dairy fouling deposition and growth mechanisms at a stainless steel surface : a multiscale approach

Auteur(s) :

Jimenez, M. [Auteur]
Delaplace, Guillaume [Auteur]
Nuns, N. [Auteur]
Bellayer, S. [Auteur]
Deresmes, D. [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Ronse, G. [Auteur]
Alogaili, G. [Auteur]
Collinet-Fressancourt, M. [Auteur]
Traisnel, M. [Auteur]

Titre de la revue :

Journal of Colloid and Interface Science

Pagination :

192-200

Éditeur :

Elsevier

Date de publication :

2013

ISSN :

0021-9797

Mot(s)-clé(s) en anglais :

Fouling
Whey protein
beta-Lactoglobulin
Stainless steel
Calcium
ToF
SIMS
Interface
AFM
EPMA
Amorphous calcium carbonate
Growth mechanism
AMORPHOUS CALCIUM-CARBONATE
INDUCED STRUCTURAL-CHANGES
HEAT-EXCHANGE APPARATUS
BETA-LACTOGLOBULIN
WHEY-PROTEIN
MILK
AGGREGATION
TEMPERATURE
KINETICS

Discipline(s) HAL :

Sciences du Vivant [q-bio]/Ingénierie des aliments
Sciences de l'ingénieur [physics]/Génie des procédés
Sciences du Vivant [q-bio]

Résumé en anglais : [en]

The microstructures of two dairy fouling deposits obtained at a stainless steel surface after different processing times in a pilot plate heat exchanger were investigated at different scales. Electron-Probe Micro Analysis, ...
Lire la suite >The microstructures of two dairy fouling deposits obtained at a stainless steel surface after different processing times in a pilot plate heat exchanger were investigated at different scales. Electron-Probe Micro Analysis, Time-of-Flight Secondary Ion Mass Spectrometry, Atomic Force Microscopy, and X-Ray Photoelectron Spectroscopy techniques were used for this purpose. The two model fouling solutions were made by rehydrating whey protein in water containing calcium or not. Results on samples collected after 2 h processing show that the microstructure of the fouling layers is completely different depending on calcium content: the layer is thin, smooth, and homogeneous in absence of calcium and on the contrary very thick and rough in presence of calcium. Analyses on substrates submitted to 1 min fouling reveal that fouling mechanisms are initiated by the deposit of unfolded proteins on the substrate and start immediately till the first seconds of exposure with no lag time. In presence of calcium, amorphous calcium carbonate nuclei are detected in addition to unfolded proteins at the interface, and it is shown that the protein precedes the deposit of calcium on the substrate. Moreover, it is evidenced that amorphous calcium carbonate particles are stabilized by the unfolded protein. They are thus more easily trapped in the steel roughnesses and contribute to accelerate the deposit buildup, offering due to their larger characteristic dimension more roughness and favorable conditions for the subsequent unfolded protein to depose. (C) 2013 Elsevier Inc. All rights reserved.Lire moins >

Langue :

Anglais

Vulgarisation :

Non

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL