Colorimetric Sensing of Benzoyl Peroxide Based on the Emission Wavelength-Shift of CsPbBr3 Perovskite Nanocrystals

Abstract

Using the ionic salt characteristics of CsPbBr3 perovskite nanocrystals (CsPbBr3 NCs), the fluorescence wavelength of CsPbBr3−xIx NCs could be changed by the halogen exchange reaction between CsPbBr3 NCs and oleylammonium iodide (OLAM-I). Under the excitation of a 365 nm UV lamp and the increase of OLAM-I concentration, the content of iodine in CsPbBr3−xIx NCs increased, and the fluorescence emission wavelength showed a redshift from 511.6 nm to 593.4 nm, resulting in the fluorescence color change of CsPbBr3 NCs from green to orange-red. Since OLAM-I is a mild reducing agent and easily oxidized by benzoyl peroxide (BPO), a novel colorimetric sensing approach for BPO based on the fluorescence wavelength shift was established in this study. The linear relationship between the different wavelength shifts (Δλ) and the concentration of BPO (CBPO) is found to be in the range of 0 to 120 μmol L−1. The coefficient of alteration (R2) and the detection limit are 0.9933 and 0.13 μmol L−1 BPO, respectively. With this approach, the determination procedure of BPO in flour and noodle samples can be achieved in only a few minutes and exhibit high sensitivity and selectivity.

Perovskite Nanocrystals: Superior Luminogens for Food Quality Detection Analysis

“…By virtue of this sensing mechanism, a fluorescent biosensor for BPO was successfully fabricated, and the developed biosensor achieved a linear range of 0−240 μmol L −1 with a low LOD of 0.13 μmol L −1 , which has also obtained good recoveries ranging of 94.0−112.0% in flour. 100 4.2. Fruit and Vegetable Products.…”

“…Benzoyl peroxide (BPO), a typical illegal additive in flour products, can oxidize natural pigments to make flour whiter and combine with proteins to form a cross-linked structure for increasing their strength and stability, while the residues of BPO in cereal products can damage the liver and other organs of human bodies. , To rapidly detect of BPO in flour, Zhang et al reported CsPbBr 3 perovskite nanocrystals with narrow half-peak width, high quantum yield, and halogen atom exchange as luminogens, and their fluorescent wavelength could be shifted by interaction with I – owing to the formation of CsPbBr 3– x I x nanocrystals, while this process could be inhibited by BPO due to their oxidized activity of I – . By virtue of this sensing mechanism, a fluorescent biosensor for BPO was successfully fabricated, and the developed biosensor achieved a linear range of 0–240 μmol L –1 with a low LOD of 0.13 μmol L –1 , which has also obtained good recoveries ranging of 94.0–112.0% in flour …”

Sensing Utilities of Cesium Lead Halide Perovskites and Composites: A Comprehensive Review

“…When BPO was added to the above solution, the original PL emission was blueshifted within 1–2 min. Zhang and co-workers also used luminescent CsPbBr 3 NCs (synthesized with the hot-injection method; PLQY = 87%) to detect BPO [ 119 ]. The linear range of BPO detection was observed between 0 µM and 120 µM, with an LOD of 0.13 µM.…”

“…The detection/quantification of specialized chemicals, such as CH 3 I, CH 2 Cl 2 , CH 2 Br 2 , benzoyl peroxide, and excessive acid number (AN), via anion exchange mechanisms [ 114 , 115 , 116 , 117 , 118 , 119 , 120 , 121 ] cannot be regarded as a specific quantification procedure because of its similarity to anion detection. This should be critically investigated to pursue the “state-of-the-art” sensing procedure.…”

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

“…Recently, several colorimetric sensing studies have been reported using the wavelength-shift of the halogen exchange characteristics of C S PbX 3 NCs, in which the concentrations of Cl − and methylamine (MA) gas, as well as the peroxide number of edible oil, have been detected [ 18 , 29 , 30 , 31 ]. In addition, based on the similar consideration, colorimetric sensing approaches have been developed for the determination of chlorine, iodine and other trace elements in tap water [ 32 ], H 2 S in rat brain microdialysate [ 27 ] and benzoyl peroxide in flour and noodle samples [ 33 ].…”