期刊
ULTRASONICS SONOCHEMISTRY
卷 78, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.ultsonch.2021.105714
关键词
Ultrasonic; Strawberry; Vacuum freeze-drying; Water migration
资金
- National Natural Science Foundation [31801561, 31701554]
- China Postdoctoral Science Foundation [2019T120401, 2020T130261]
- 2020 Provincial Policy Guidance Program (Subei Science and Technology Project) [SZHZ202002]
- Open Project Program of Jiangsu Key Laboratory of Regional Resource Exploitation and Medicinal Research, Huaiyin Institute of Technology [LPRK201802]
The study investigated the effects of osmotic pretreatment assisted by ultrasound in different frequency modes on moisture migration and quality characteristics of strawberry slices during vacuum freeze-drying. Results showed that dual-frequency ultrasound significantly reduced drying time and the SeDM mode was most effective in improving the quality of dried strawberry products.
The effects of osmotic pretreatment assisted by ultrasound in different frequency modes before vacuum freezedrying (VFD) on moisture migration and quality characteristics of strawberry slices were investigated. The frequency modes are single-frequency modes under 20, 40 kHz (SM-20, SM-40), and dual-frequency under 20/ 40 kHz including sequential mode (SeDM) and simultaneous mode (SiDM). The quality characteristics of dried strawberry products including rehydration, hardness, color, flavor, total anthocyanins, total phenols, vitamin C content, and active antioxidant components (DPPH and -OH) were determined. Results showed that drying time of the strawberry slices irradiated by ultrasound was reduced by 15.25%-50.00%, compared to the control samples. Besides, dual-frequency ultrasound shortened the drying time more than single-frequency ultrasound. The drying time of SeDM was the shortest. In addition to vitamin C content, the quality characteristics including rehydration, hardness, color, flavor, total anthocyanins, total phenols, and antioxidant activity of dried strawberry products pretreated by SeDM were significantly (p < 0.05) better than those of control and other pretreated samples. It can be concluded that the SeDM was an effective pretreatment method to produce high-quality vacuum freeze-dried strawberry products.
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