Title

Effect of Storage Time on Physical Properties of Sonocrystallized All‐Purpose Shortening

Document Type

Article

Journal/Book Title/Conference

Journal of Food Science

Volume

85

Issue

10

Publisher

Wiley-Blackwell Publishing, Inc.

Publication Date

9-13-2020

Award Number

USDA, National Institute of Food and Agriculture (NIFA) 2017-67017-26476

Funder

USDA, National Institute of Food and Agriculture (NIFA)

First Page

3391

Last Page

3399

Abstract

The purpose of this study was to determine the effect of high‐intensity ultrasound (HIU) on the physical properties of an all‐purpose shortening and to evaluate how these properties changed during storage (48 hr; 4, 12, and 24 weeks) at 5 °C and 25 °C. Samples were crystallized at 30 °C for 60 min with and without the application of HIU (20 kHz; 3.2 mm‐diameter tip, 168 µm amplitude, 10 s). After crystallization, physical properties, such as hardness, elasticity, melting behavior, and solid fat content (SFC), were measured. These properties were also measured during storage. The effect of HIU was significant in changing the SFC, hardness, G′ and G′′, melting enthalpy, and microstructure of the samples. After 60 min of crystallization, the sonicated samples had higher values of SFC, hardness, elasticity, and melting enthalpy than the ones obtained without sonication (P < 0.05). Changes in these physical properties were associated with the microstructure of the samples since sonication generated smaller, more uniformly sized crystals as well as increased the number of crystals. No differences were observed in the G′ of the sonicated samples stored at 25 °C as a function of storage period. The G′ of the nonsonicated samples increased until 12 weeks of storage and was maintained up to 24 weeks, suggesting that sonication speed up the formation of a stable crystalline network. Samples stored at 5 °C showed higher value in hardness, G′ and G′′, and SFC than the ones stored at 25 °C.

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