Synergistic mechanism of steam blanching and freezing conditions on the texture of frozen yellow peaches based on macroscopic and microscopic properties

文献类型： 外文期刊

第一作者： Xian, Meilin

作者： Xian, Meilin;Bi, Jinfeng;Hu, Lina;Xie, Yitong;Zhao, Yinuo;Jin, Xin

作者机构：

关键词： blanching; freezing conditions; microstructure; textural quality; water holding capacity; yellow peaches

期刊名称：JOURNAL OF TEXTURE STUDIES （ 影响因子：3.2； 五年影响因子：3.3 ）

ISSN： 0022-4901

年卷期： 2024 年 55 卷 2 期

页码：

收录情况： SCI

摘要： Freezing and blanching are essential processing steps in the production of frozen yellow peaches, inevitably leading to texture softening of the fruit. In this study, the synergistic mechanism of stem blanching, freezing conditions (-20 degrees C, -40 degrees C, -80 degrees C, and liquid nitrogen [-173 degrees C]), and sample sizes (cubes, slices, and half peaches) on macroscopic properties of texture, cellular structure, and ice crystal size distribution of frozen yellow peaches were measured. Blanching enhanced the heat and mass transfer rates in the subsequent freezing process. For nonblanched samples, cell membrane integrity was lost at any freezing rate, causing a significant reduction in textural quality. Slow freezing further exacerbated the texture softening, while the ultra-rapid freezing caused structural rupture. For blanched samples, the half peaches softened the most. The water holding capacity and fracture stress were not significantly affected by changes in freezing rate, although the ice crystal size distribution was more susceptible to the freezing rate. Peach cubes that had undergone blanching and rapid freezing (-80 degrees C) experienced 4% less drip loss than nonblanched samples. However, blanching softened yellow peaches more than any freezing conditions. The implementation of uniform and shorter duration blanching, along with rapid freezing, has been proven to be more effective in preserving the texture of frozen yellow peaches. Optimization of the blanching process may be more important than increasing the freezing rate to improve the textural quality of frozen yellow peaches. Blanching softened yellow peaches more than any freezing conditions. Slow freezing further exacerbated the texture softening. Blanching combined with rapid freezing reduces ice crystal size and decreases drip loss of frozen yellow peaches. image

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