Effects of Frozen Storage on the Physical Properties and Sensory Acceptability of Goat’s Milk Yoghurt

Nguyen Duc Doan 1 and Vicky Ann Solah 2

1Faculty of Food Science and Technology, Vietnam National University of Agriculture, Hanoi 131000, Vietnam
2Food Science and Nutrition Program, College of Science, Health, Engineering and Education, Murdoch University, Murdoch, 6150, Western Australia, Australia
Received: Feb 14, 2019 /
Revised: Jul 11, 2020 /
Published: Jun 5, 2020

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Abstract

The effects of frozen storage of goat’s milk on the physicochemical, physical properties, and sensory attributes of goat’s milk yoghurts were evaluated. Four yoghurts were made from goat’s milk stored at 4℃ overnight, and at -6, -20, or -35℃ for 1 month. Goat’s milk yoghurts were stored at 6℃ for 21 days. Protein and lipid contents in all the yoghurts were insignificantly different, however, the total solids content, including the added sugar in the yoghurts made from frozen goat’s milk, significantly increased in comparison with that in the yoghurt made from chilling goat’s milk. The water holding capacity (WHC) and viscosity for all the yoghurts at any period of cold storage were statistically different. No significant differences in pH or titratable acidity for all the yoghurts were observed after 1 day of cold storage; however, these physicochemical properties for the yoghurts after 7 days of storage were significantly different. All the yoghurts after 21 days of storage received similar scores for appearance and texture, but significantly different scores for color, odor, flavor, and overall acceptability. 

Keywords: Goat’s milk, goat’s milk yoghurt, frozen storage, physical properties, sensory acceptability

Article Details

How to Cite
Doan, N. D., & Solah, V. (2020). Effects of Frozen Storage on the Physical Properties and Sensory Acceptability of Goat’s Milk Yoghurt. Vietnam Journal of Agricultural Sciences, 3(1), 487-494. https://doi.org/10.31817/vjas.2020.3.1.01

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