Colorimetric Sensing of the Peroxide Number of Milk Powder Using CsPbBr3 Perovskite Nanocrystals

Abstract

In this study, a wavelength-shift-based colorimetric sensing approach for the peroxide number of milk powder using CsPbBr3 perovskite nanocrystals (CsPbBr3 NCs) has been developed. Through the fat extraction, REDOX reactions and halogen exchange, as well as the optimized experimental conditions, a colorimetric sensing method was established to determine the peroxide number of milk powder samples. The integrated process of milk powder fat extraction and the REDOX process greatly shortened the determination time. This colorimetric method has a good linear correlation in the range of the peroxide number from 0.02 to 1.96 mmol/kg, and the detection limit was found to be 3 μmol/kg. This study further deepens the application prospect of wavelength-shift-based colorimetric sensing using CsPbBr3 NCs.

Perovskite Nanocrystals: Superior Luminogens for Food Quality Detection Analysis

“…Besides, this work has also established a pretreatment method for fat extraction, which benefited the subsequent detection. The proposed biosensor achieved a low LOD of 3 μmol kg –1 in the linear range of 0.02–1.96 mmol kg –1 in milk powder within 20 min …”

“…The proposed biosensor achieved a low LOD of 3 μmol kg −1 in the linear range of 0.02−1.96 mmol kg −1 in milk powder within 20 min. 118 The residue of veterinary drugs in dairy products is a significant concern for dairy safety, which not only poses risks to human health but also has economic implications for the dairy industry. 119,120 Chloramphenicol, a broad-spectrum antibiotic, is widely utilized in livestock husbandry for antibacterial infection, while the abuse of chloramphenicol results in negative impacts on human bodies.…”