Effect of high pressure microfluidization on the crystallization behavior of palm stearin - palm olein blends.

Lijuan Han,Bing Li,Lei Zhao,Guoqin Liu,Xuede Wang,Xinqi Liu,Lin Li

doi:10.3390/molecules19045348

Abstract

Moderate and high microfluidization pressures (60 and 120 MPa) and different treatment times (once and twice) were used to investigate the effect of high-pressure microfluidization (HPM) treatment on the crystallization behavior and physical properties of binary mixtures of palm stearin (PS) and palm olein (PO). The polarized light microscopy (PLM), texture analyzer, X-ray diffraction (XRD) and differential scanning calorimetry (DSC) techniques were applied to analyze the changes in crystal network structure, hardness, polymorphism and thermal property of the control and treated blends. PLM results showed that HPM caused significant reductions in maximum crystal diameter in all treated blends, and thus led to changes in the crystal network structure, and finally caused higher hardness in than the control blends. The XRD study demonstrated that HPM altered crystalline polymorphism. The HPM-treated blends showed a predominance of the more stable β' form, which is of more interest for food applications, while the control blend had more α- and β-form. This result was further confirmed by DSC observations. These changes in crystallization behavior indicated that HPM treatment was more likely to modify the crystallization processes and nucleation mechanisms.

Highlights

High-pressure microfluidization (HPM) is an emerging technology, which makes use of a device called a microfluidizer
The Polarized light microscopy (PLM) recorded of the control sample and those prepared under two pressures (60 MPa and 120 MPa) stored for varied length of time (0 h, 4 h, 1 day and 5 days) ae shown in Figures 1–3, respectively
high-pressure microfluidization (HPM) treatment could increase the hardness of palm stearin (PS)/palm olein (PO) blends, and this increase was a little more evident by increasing treatment time

Summary

Introduction

High-pressure microfluidization (HPM) is an emerging technology, which makes use of a device called a microfluidizer This device uses a high-pressure positive displacement pump (the pressure vrange is approximately 5–200 MPa) [1]. High-pressure microfluidization uses the combined forces of high-velocity impact, high-frequency vibration, instantaneous pressure drop, intense shear, cavitation, and ultra-high pressures up to 200 MPa with a short treatment time (less than 5 s) and continuous operation [9,10]. It differs from high hydrostatic pressure (HHP), which only uses ultra-high pressures from 100 to 1500 MPa [11], but has some vibration and cavitation similarities with sonication. Information on the effects of HMP on lipid crystallization behavior is not available

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Conclusion