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Synchrotron study on crystallization kinetics of milk fat under shear flow

A detailed synchrotron X-ray diffraction study on the kinetics of crystallization of anhydrous milk fat (AMF) and milk fat triacylglycerols (MFT) was done in a Couette cell at 17 °C, 17.5 °C and 20 °C under shear rates between 0 and 2880 s −1. We observed shear-induced acceleration of the transition...

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Published in:Food research international 2009-06, Vol.42 (5), p.682-694
Main Authors: Mazzanti, Gianfranco, Marangoni, Alejandro G., Idziak, Stefan H.J.
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description A detailed synchrotron X-ray diffraction study on the kinetics of crystallization of anhydrous milk fat (AMF) and milk fat triacylglycerols (MFT) was done in a Couette cell at 17 °C, 17.5 °C and 20 °C under shear rates between 0 and 2880 s −1. We observed shear-induced acceleration of the transition from phase α to β′ and the presence of crystalline orientation, but no effect of shear on the onset time of phase α was observed. A two stage regime was observed for the growth of phase β′. The first stage follows a series–parallel system of differential equations describing the conversion between liquid and crystalline phases. The second stage follows a diffusion-controlled regime. These mechanisms are consistent with the crystalline orientation, the growth of the crystalline domains and the observed displacement of the diffraction peak positions. The absence of the polar lipids explains the faster kinetics of MFT.
doi_str_mv 10.1016/j.foodres.2009.02.009
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subjects Biological and medical sciences
Crystal structure
Crystallization
Crystallization of fats under shear flow
Differential equations
Diffraction
diffusion
Diffusion controlled crystal growth
diffusivity
equations
Food industries
Fundamental and applied biological sciences. Psychology
kinetics
Milk
Milk and cheese industries. Ice creams
milk fat
Milk fat crystallization
Modelling kinetics of crystallization
Orientation
Phase transformations
Shear flow
Synchrotron X-ray diffraction
Synchrotrons
triacylglycerols
X-ray diffraction
title Synchrotron study on crystallization kinetics of milk fat under shear flow
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