Oxygen-bridged carboxylic acid cadmium complex for rapid fluorescence detection of vanillin in milk powder and preparation method and application of test paper modified by oxygen-bridged carboxylic acid cadmium complex

The invention discloses an oxygen bridge carboxylic acid group cadmium complex for rapidly detecting vanillin in milk powder through fluorescence and a preparation method and application of test paper modified by the oxygen bridge carboxylic acid group cadmium complex. The molecular formula of the complex is as follows: [Cd (L) (cmpba)], wherein L is N, N '-bis (4-methylene pyridine) naphthalene-2, 6-dicarboxamide, and cmpba is 2-[(4-carboxymethyl phenoxy) benzoic acid radical. The preparation method comprises the following steps: grinding an oxygen-bridged carboxylic acid cadmium complex by adopting an agate mortar, dispersing into ethanol, grinding by using a ball mill, centrifugally separating out a microcrystalline cadmium complex material, drying, putting the microcrystalline cadmium complex material and rectangular rapid filter paper into a beaker, carrying out ultrasonic treatment, standing and drying to obtain the oxygen-bridged carboxylic acid cadmium complex modified fluorescent rapid detection test