利用核磁共振技术研究鱼糜制品在储藏过程中的水分变化

摘要

The spin-spin relaxation time T2 and water content change in surimi products were measured by NMR in this study.The change of water spatial distribution and mobility in two kinds of surimi products at-18 ℃（normal storage temperature） and 4/-18 ℃（enlarged temperature change during storage） was explored.The results indicated that both kinds of surimi products had four kinds of water mobility,which were T21,T22,T23,and T24.T21 and T22 were bound water and exhibited little change during storage.T23 and T24 revealed higher mobility,which was the critical water change during storage.Water change of surimi products under the condition of 4/-18 ℃ was stronger than under the condition of-18 ℃ and even most closely bound water（corresponding to T21） showed a change.%利用核磁共振技术（NMR）监测鱼糜制品相应的自旋-自旋弛豫时间T2以及各组分水的含量变化。研究墨鱼丸、花枝丸两种鱼糜制品在-18℃（正常储藏温度）以及4℃/-18℃（扩大化模拟冷库温度变化）两种储藏条件下各种水分的分布和迁移情况。结果表明：这两种鱼糜制品具有4种流动性不同的水分,其对应的弛豫时间分别为T21、T22、T23、T24（0ms〈T21〈0.6ms,1ms〈T22〈3ms,10ms〈T23〈30ms,75ms〈T24〈175ms）。弛豫时间T21和T22对应的水为结合水,在储藏过程中变化不大,T23和T24对应的水流动性较大,是水分变化的关键部分。在4℃/-18℃条件下水分的变化比-18℃储藏条件下的变化显著,甚至连结合最紧密的水（T21对应的结合水）也会发生变化。