Advantages of Liquid Nitrogen Quick Freezing Combine Gradient Slow Thawing for Quality Preserving of Blueberry

文献类型： 外文期刊

第一作者： Cheng, Lina

作者： Cheng, Lina;Wu, Weijun;An, Kejing;Xu, Yujuan;Yu, Yuanshan;Wen, Jing;Wu, Jijun;Zou, Ying;Liu, Haocheng;Zhu, Jieli;Xiao, Gengsheng;Wu, Weijun;Xiao, Gengsheng

作者机构：

关键词： liquid nitrogen quick freezing (NF); gradient thawing; blueberry; quality

期刊名称：CRYSTALS （ 影响因子：2.589； 五年影响因子：2.615 ）

ISSN： 2073-4352

年卷期： 2020 年 10 卷 5 期

页码：

收录情况： SCI

摘要： Berries are perishable fruits with high nutritional value. Freezing is an effective way for food preservation. Freezing and thawing methods play key roles in preserving edible values and commodity values of food. This study investigated the effects of spray liquid nitrogen quick freezing (NF-20 similar to-100 degrees C) and gradient thawing on the physical and functional characteristics of blueberries by using immersion and refrigerator freezing and microwave, ultrasonic, room- and low-temperature, and static-water thawing as comparisons. The results show that NF-80 degrees C freezing combined with -20 similar to-5 similar to 4 degrees C. gradient thawing can retain more than 95% of polyphenols and other nutritional compounds (including pectin, soluble sugar, and vitamin C) in thawed blueberries compared with fresh blueberries. Besides, this method shows the best results in preserving the hardness, cell structure, and water distribution of blueberries. It is also revealed that the ultralow temperature (-100 degrees C) freezing does not bring a significant advantage in preserving blueberries. Rapid thawing methods such as microwave and ultrasound thawing are not suitable for blueberries, which might be due to their small size and thin skin. The results suggested that the combination of NF-80 degrees C freezing and -20 similar to-5 similar to 4 degrees C gradient thawing is the optimal process for blueberry preservation. The outcomes of this study will serve as theoretical guidance for improving the industrial process for freezing and thawing blueberries.

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