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    Rehydration characteristics of vacuum freeze- and hot air-dried garlic slices

    Year: 2021

    Journal: LWT-Food Sci. Technol., Volume 143, MAY

    Authors: Zhou, Cunshan; Feng, Yabin; Zhang, Lei; Yagoub, Abu ElGasim A.; Wahia, Hafida; Ma, Haile; Sun, Yanhui; Yu, Xiaojie

    Organizations: National Key Research and Development Program of China [2017YFD0400903-01, 2016YFD0400705-04, 2018YFD0700101-02]; Science and Technology Major Project of Anhui [18030701152]; National Natural Science Foundation of China [31801599]

    Keywords: Garlic slice; Vacuum freeze; and hot air-drying; Rehydration characteristics; Microstructure; Air bubble

    This work aimed to study the rehydration characteristics of vacuum freeze- (VFD) and hot air-dried (HAD) garlic slices and explain the rehydration mechanism. It was observed that VFD samples had significantly faster water absorption rates than HAD samples. However, VFD samples had lower final moisture contents than the HAD samples. Additionally, the effect slice thickness on rehydration characteristics of samples was lower than that of drying methods. The contact angle and microstructure analysis of dried samples revealed that the strong water wettability and the porous structure contributed to the faster water absorption rate of VFD samples. Moreover, we found and confirmed, for the first time, that numerous air bubbles trapped in the VFD samples hindered the absorption of water. This resulted in a lower water holding capacity in VFD samples compared with HAD samples, which had less air bubbles.
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