Dynamic Vapor Sorption Used to Screen Metal-Organic Frameworks for Vinyl Acetate SPME Coating Compatibility

A new paper published on 09 May 2026 presents a screening strategy for vinyl acetate materials intended for solid-phase microextraction based on dynamic vapor sorption. com reported. In solid-phase microextraction research, selecting a coating adsorbent with good compatibility for target molecules can be difficult.

There is no specific migration testing method for vinyl acetate monomer commonly used in food contact materials. Thirteen metal-organic frameworks with different structural characteristics and surface chemical environments were prepared by Jiajia Niu, Jichun Zhao, Liqing Yue, Wanchen Zang, Zhe Jin, Cuiliu Fu, Chen Chen, Li Dong, Youliang Zhu and Xiaojie Li.

These 13 MOFs were divided into three groups — good, medium and poor — based on the dynamic vapor sorption method.

The distinction of superiority and inferiority determined by the dynamic vapor sorption method was completely consistent with that determined by the extraction effect of the SPME probe. Data from the dynamic vapor sorption method and SPME extraction effect exhibited a statistically significant positive correlation.

Electrostatic potential distribution on the typical material surface and target molecule, along with the charge density difference of their interaction during adsorption, were obtained using computational simulation.

ZIF-68 and ZIF-70 recorded the highest adsorption energy, and this highest adsorption energy was consistent with their adsorption performance. ZIF-68 was selected as the optimal adsorption material. Extraction conditions using ZIF-68 were optimized, and the optimized method was applied to test the specific migration amounts of several ethylene vinyl acetate copolymer materials.

Jiajia Niu, Liqing Yue, Chen Chen, Li Dong and Xiaojie Li are affiliated with the Zhengzhou Tobacco Research Institute of CNTC in Zhengzhou, China. Jichun Zhao is affiliated with the State Key Laboratory of Polymer Physics and Chemistry at the Changchun Institute of Applied Chemistry, Chinese Academy of Sciences in Changchun, China, the University of Science and Technology of China in Hefei, China and Jilin Tobacco Industry Company in Changchun, China.

The authors declare no competing interests.