Duan Xixin, Bai Zhixian, Shao Xueting, Xu Jian, Yan Ning, Shi Junyou, Wang Xiaohong
Jilin Provincial Key Laboratory of Wooden Materials Science and Engineering, Beihua University, Jilin 132013, China.
Key Lab of Polyoxometalate Science of Ministry of Education, Northeast Normal University, Changchun 130024, China.
Materials (Basel). 2018 Apr 26;11(5):674. doi: 10.3390/ma11050674.
A novel colorimetric detection method based on the peroxidase-like activity of metal-substituted polyoxometalates (POMs) of SiW₉M₃ (M = Co, Fe, Cu, Mn) has been established. POMs can catalyze oxidation of dopamine (DA) and ractopamine (RAC) by H₂O₂ in aqueous solutions. SiW₉Co₃-based POMs detect DA at concentrations as low as 5.38 × 10 mol·L simply by observation of the color change from colorless to orange using the naked eye. RAC is detected by observing the change from colorless to slight red by SiW₉Cu₃ with a detection limit of 7.94 × 10 mol·L. This study shows that colorimetric DA and RAC detection using SiW₉Co₃ and SiW₉Cu₃ is highly selective and sensitive as well as visually observable.
基于硅钨酸盐（SiW₉M₃，M = Co、Fe、Cu、Mn）的类过氧化物酶活性，建立了一种新型比色检测方法。多金属氧酸盐可在水溶液中催化过氧化氢（H₂O₂）氧化多巴胺（DA）和莱克多巴胺（RAC）。基于SiW₉Co₃的多金属氧酸盐仅通过肉眼观察从无色到橙色的颜色变化，就能检测低至5.38×10⁻⁸mol·L⁻¹浓度的DA。通过观察SiW₉Cu₃从无色到浅红色的变化来检测RAC，检测限为7.94×10⁻⁸mol·L⁻¹。本研究表明，使用SiW₉Co₃和SiW₉Cu₃进行比色检测DA和RAC具有高选择性、高灵敏度以及视觉可观测性。
