食品安全是国家战略，针对我国现行大米陈化分析方法主观性强、准确性低、重复性差、检测周期长的问题，本项目拟结合二氧化钛纳米树（B-TiO2）较大的比表面积、醛基与氨基间亚胺键的构建与解离、分子印迹物（MIPs）的高选择性识别萃取能力以及玻璃磁力搅拌子可修饰和快速分离的优点，制备集样品分散、选择性吸附、高效富集、快速分离于一体的B-TiO2-NH2功能化和B-TiO2-MIPs功能化的玻璃磁力搅拌子萃取介质，并将其用于大米中醛类和2-乙酰基-1-吡咯啉（2-AP）目标物的选择性萃取，结合色谱分析技术，研究大米中目标物的快速、定性定量分析与检测。详细研究功能化玻璃磁力搅拌子的选择性、吸附容量和吸附速率，以及对目标物的识别、吸附、富集及释放机理，明确大米中醛类和2-AP含量变化与大米陈化程度之间的关联性。本项目旨在研究科学准确的大米陈化程度鉴定技术和检测方法，为粮食的陈化分析提供客观准确的新技术。

The present analysis method with strong subjectivity, low accuracy, poor repeatability and long detection cycle, is the key challenge in the rice aging analysis. In this project, branched TiO2 (B-TiO2) with high specific surface area, and flexible construction and dissociation of imide bonds between aldehyde and amino groups, high selectivity of the molecular imprinted polymers (MIPs), together with instant separated ability of the glass magnetic stir bar from the matrix would be combined to prepare amino functional B-TiO2 bounded glass magnetic stir bar and MIPs functional B-TiO2 bounded glass magnetic stir bar, respectively. The prepared materials would be applied in the selective extraction of the aldehydes and 2-AP, and the rapidly qualitative and quantitative detection of them in the aging rice would also be realized by combing with chromatography-mass spectrometer. The selectivity, adsorption capacities and the adsorption rates of the prepared materials could be characterized, and the mechanisms on the recognition, adsorption, enrichement and release of the materials toward the analytes would be studied in this project. The relationship between the aldehydes and 2-AP contents and the aging degree of the rice would also be studied. This project will not only has significant scientific values for the discussion on aging mechanism of rice, the enrichment of the identification methods for rice aging degree, the establishment of the testing standard of the aging rice, but also would provide new ideas for the aging identification of other grains.