低场核磁共振及成像技术对海参复水过程水分状态变化的研究

采用低场核磁(NMR)及其成像技术(MRI)研究海参中的水分含量、分布及状态变化,测量不同复水时间以及高温蒸煮处理后海参的横向弛豫时间T2。通过T1加权成像技术,观察复水海参体内自由水、不易流动水和结合水分布的变化。结果表明,海参复水过程初期随着复水时间延长,海参体内自由水、不易流动水含量增加,水分自由度增加;高温蒸煮使复水海参体内自由水和不易流动水含量都减少,随着复水时间增加,自由水含量增加,但不易流动水含量变化不显著。低场核磁技术为海参复水加工过程中物性参数的研究提供了一种有效方法。 

Study on the change of moisture state in sea cucumber during rehydration processing by LF-NMR and LF-MRI

Study on the water content, distribution and state change of sea cucumber (Acaudina molpadioidea) by using LF-NMR and MRI had been conducted. Transverse relaxation time T2 of sea cucumber with different rehydration time and thermophilic digestion treatment were measured by LF-NMR. The distribution of free water, extra-cellular water and bound water were observed through T1 weighted image during rehydration processing of sea cucumber. The results showed the content of free water and extra-cellular water increased as the rehydration time growed at the early stage of rehydration and then decreased after thermophilic digestion treatment. The content of free water increased with the growing immersion time while the content of extra-cellular water did not change significantly. LF-NMR provided an effective way to research the physical parameters.