篇名 | 以核磁共振影像分析技術觀察貯存期間兩動物膠膠體之水分子狀態 |
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卷期 | 12:3 |
並列篇名 | Water Status of Two Gelatin Gels during Storage as Determined by Magnetic Resonance Imaging |
作者 | 鍾依林 、 賴喜美 |
頁次 | 221-227+288 |
關鍵字 | 核磁共振影像 、 動物膠膠體 、 水分子狀態 、 弛緩時間 、 水活性 、 Water status 、 Gelatin gel 、 Magnetic resonance imaging 、 MRI 、 Transverse relaxation time 、 T[feaf] 、 Water activity 、 Aw 、 MEDLINE 、 Scopus 、 SCIE |
出刊日期 | 200409 |
A two-gelatin-gel model system was used to investigate the water status of two gels with different Aw, 0.968 (H-gel) and 0.828 (Lgel), using magnetic resonance imaging (MRI) techniques. A multi slice-multi echo pulse sequence was applied and the transverse relaxation time (T2) of water protons was calculated. During storage the average T2 values of H-gel decreased, while those of L-gel increased. However, at the end of storage (15 days) when the Aw of two gels were the same, the average T2 values of L-gel were larger than those of H-gel, and heterogeneous T2 values were observed in both gels. This was due to water migration between the two gels and redistribution of water in each gel during storage. The two-gelatin gel model system and nondestructive MRI technique established in this study offer a good method to monitor moisture redistribution between gels with different Aw and to investigate the water status and structural changes in food systems during storage.