豌豆浸泡过程中的吸水动力学研究

利用Peleg模型方程和低场核磁共振技术(LF-NMR)对豌豆浸泡吸水过程进行研究,目的是通过新的角度来解释豌豆浸泡过程中水分子的动态变化,通过把豌豆浸泡在不同水合温度和不同浸泡时长的环境中,每隔1 h测定其含水量、脉冲信号幅值、弛豫时间.结果表明,在25～40℃浸泡条件下,豌豆中的含水量可以用Peleg方程进行模拟,...

Study on Water Absorption Kinetics of Peas during Soaking

The Peleg model equation and low-field nuclear magnetic resonance (LF-NMR) were utilized to study the water absorption process of pea during soaking, for the purpose of explaning the dynamic water absorbing process of peas from a new point of view. By immersing peas in the environment of different hydration temperature and different soaking time, and taking out every 1 h for testing the water absorption, pulse signal amplitude, and relaxation time. From the results, the changing of the water content in peas during soaking at 25~40 ℃ could be simulated by the Peleg equation. The constants K₁ and K₂ were obtained, the constant K₁ decreased with the increasing of temperature, and the percentage deviation modulus E was less than 10%, and the activation energy (E_a) of the soaking process was 32.01 kJ/mol. In addition, there were three states of water in the pea soaking process, including strongly bound water, weakly bound water, free water. The soaking temperature rose, the content of free water and bound water increased first and then balanced, and the higher the temperature, the shorter the time to reach equilibrium. Finally, the optimal soaking time was determined to be 10 h.