制备了硫代苹果酸功能化的银纳米颗粒（TMA-AgNPs），随着Al³⁺浓度的增加，TMA-AgNPs上的功能基团与Al³⁺发生相互作用导致TMA-AgNPs的聚集，溶液颜色由黄色逐渐变为橘红色，据此采用分光光度法测定面制食品中铝含量。优化的试验条件如下：1 5.0 mmol·L^-1硫代苹果酸溶液的用量为2 mL；2修饰反应时间为10 min；3 Al³⁺与TMA-AgNPs的作用时间为2 min。Al³⁺的线性范围为0.10~5.00 μmol·L^-1，检出限（3S/N）为0.031 μmol·L^-1。方法用于面制食品样品的分析，加标回收率为97.0%~105%，测定值的相对标准偏差（n=5）为2.1%~3.1%。

Silver nanoparticles (TMA-AgNPs) functionalized by thiomalic acid were prepared. The interaction between the functional groups of the TMA-AgNPs and Al³⁺ resulted in the aggregation of TMA-AgNPs accompanied by a color change from yellow to orange with increase of Al³⁺ ion concentration. Based on this fact, spectrophotometry was applied to the determination of aluminum in flour foods. The optimized conditions found were as follows:① amount of 5.0 mmol·L^-1 thiomalic acid solution was 2 mL; ② modification reaction time was 10 min; ③ interaction time of Al³⁺ and TMA-AgNPs was 2 min. Linearity range of Al³⁺ was found between 0.10 μmol·L^-1 and 5.00 μmol·L^-1 with detection limit (3S/N) of 0.031 μmol·L^-1. The proposed method was applied to the analysis of samples of flour foods, giving values of recovery found by standard addition method and RSDs (n=5) of determined values in the ranges of 97.0%-105% and 2.1%-3.1% respectively.