Effects of ultrasonic pretreatment on drying characteristics and water migration characteristics of freeze-dried strawberry

IF 9.8 1区农林科学 Q1 CHEMISTRY, APPLIED

Food Chemistry Pub Date : 2024-04-16 DOI:10.1016/j.foodchem.2024.139287

Xinyue Zhang, Ya Wang, Rui Nian, Qianyu Li, Danshi Zhu, Xuehui Cao

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Abstract

The effects of ultrasonic pretreatment on the drying characteristics and microstructure of strawberry slices were investigated. The rehydration characteristics of freeze-dried products, which were pre-frozen at −20 °C and − 80 °C were explored, with a focus on water mobility and distribution. The ultrasonic pretreatment significantly increased the water mobility of the strawberry slices, resulting in a reduction in their water content. However, the application of ultrasound significantly decreased the rehydration speed, indicating a lower moisture absorption capacity in the pretreated sample. The micrographs revealed that the structure of the tissue was more uniform after ultrasonic treatment, and water loss was accelerated. In addition, the contact angle measurements showed that the samples were more hydrophobic after ultrasonic treatment, and the eutectic temperature and fold point of the samples increased. Therefore, this study found that ultrasonic-assisted freeze vacuum drying technology effectively reduces hygroscopicity, improves product storage, and represents a potential method for dried production.

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超声波预处理对冻干草莓干燥特性和水分迁移特性的影响

研究了超声波预处理对草莓片干燥特性和微观结构的影响。研究还探讨了在-20 °C和-80 °C下预冻的冻干产品的再水化特性，重点关注水的流动性和分布。超声波预处理大大提高了草莓片的水分流动性，从而降低了草莓片的含水量。然而，超声波的应用明显降低了再水化速度，这表明预处理样品的吸湿能力较低。显微照片显示，超声波处理后组织结构更加均匀，水分流失加快。此外，接触角测量结果表明，样品经超声波处理后疏水性更强，样品的共晶温度和折点也有所提高。因此，本研究发现，超声波辅助冷冻真空干燥技术可有效降低吸湿性，改善产品储存，是一种潜在的干燥生产方法。

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来源期刊

Food Chemistry 工程技术-食品科技

CiteScore

16.30

自引率

10.20%

发文量

3130

审稿时长

122 days

期刊介绍： Food Chemistry publishes original research papers dealing with the advancement of the chemistry and biochemistry of foods or the analytical methods/ approach used. All papers should focus on the novelty of the research carried out.