Assessing the supercooling of fresh-cut onions at -5°C using electrical impedance analysis.
Assessing the supercooling of fresh-cut onions at -5°C using electrical impedance analysis.
复制标题
使用电阻抗分析评估 -5°C 鲜切洋葱的过冷度。
DOI：
10.1093/fqsafe/fyz044
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发表时间：
2020
影响因子：
5.6
通讯作者：
Uemura M.
中科院分区：
文献类型：
--
作者：
Koide S;Yoneyama A;Orikasa T;Uemura M.
我们将鲜切洋葱在−5°C下过冷12 h。过冷后，通过电阻抗谱在42 Hz-5 MHz的频率范围内评价样品的电阻抗特性。样品的时间-温度曲线表明，凝固点和过冷点分别为−2.3°C ± 0.7°C和−6.9°C ± 1.0°C。结果表明，在36个过冷样品中，有34个样品的Cole-Cole曲线呈现一定的圆弧，表明细胞膜在过冷过程中保持完整。在另外两个没有表现出明确的圆弧的样品中，细胞膜在过冷过程中受到了严重的损伤。此外，在Cole-Cole图中显示出确定的圆弧的过冷样品与不显示出确定的圆弧的样品之间的滴水损失百分比存在很大差异。我们的研究结果表明，鲜切洋葱可以在−5°C下过冷。
We supercooled fresh-cut onion at −5°C for 12 h. After supercooling, the electric impedance properties of the samples were evaluated by electrical impedance spectroscopy over the frequency range of 42 Hz − 5 MHz. The time-temperature profiles of samples indicated that the freezing point and supercooling point were −2.3°C ± 0.7°C and −6.9°C ± 1.0°C, respectively. The results indicated that 34 of the 36 supercooled samples exhibited a definite circular arc in the Cole-Cole plot, which suggested that the cell membrane remained intact during supercooling. In the other two samples which did not exhibit a definite circular arc, the cell membrane had sustained serious damage during supercooling. Furthermore, there was large difference in drip loss percentage between supercooled samples exhibited a definite circular arc in the Cole-Cole plot and samples not exhibiting a definite circular arc. Our results suggest that fresh-cut onions can be supercooled at −5°C.