水合作用是指在水溶液中水分子和溶质分子的一种相互作用。理解多溶质水合作用的机理是非常重要的，因为其涉及到许多生物学现象。本项目在我们前期工作观察到塑化剂乙醇溶液的THz吸收光谱与塑化剂浓度变化呈非线性关系的基础上，拟以乙醇塑化剂水溶液为研究对象，采用THz衰减全反射光谱技术测量溶液光谱信号，利用多元曲线分辨交替最小二乘方法分析光谱数据.在测得乙醇及塑化剂水合层半径，水合分子数等参数后，研究乙醇水合层与塑化剂水合层间的相互作用，结合分子动力学模拟，建立多溶质水溶液水合作用的模型。本项目的实施将为多溶质水溶液微观结构和相互作用研究打下理论基础，并可能对研究不同蛋白质在生物水中的相互作用及其功能表达提供重要的方法论。

Hydration is the interaction between water and solvated molecules in aqueous solutions. Hydration understanding of multi solutes in aqueous solutions is a crucial point because the hydration phenomenon is involved in many biological processes. In our previous work, it is found that the THz absorption cofficient is nonlinear versus plasticizer concentration in ethanol solutions. Based on this observation, the research project intends to choose alcohol- plasticizer aqueous solution as the object of study, adopt THz attenuated total reflection spectroscopy to obtain THz spectrum, and utilize multivariate curve resolution alternating least squares(MCR-ALS) method to analyze the spectral data. After the hydration layer radius and hydration molecular numbers for ethanol and plasticizer are measured, respectively, the interaction between ethanol hydration layer and plasticizer hydration layers is derived. Thus the multi solute solution hydration model is built by means of the molecular dynamics simulation. The implementation of this project will establish the theoretical foundation for the study of aqueous solution of microstructure and the interaction between solutes, and may provide an important methodology to study function expression and interaction of different proteins and in the biological water.