Benzoyl Peroxide In Flour Samples Research Articles

An intelligent smartphone-test strip detection platform for rapid and on-site sensing of benzoyl peroxide in flour samples

Benzoyl peroxide (BPO) is a commonly used flour whitener, but its excessive usage can have adverse effects on human health, such as nutrient loss, vitamin deficiencies and certain diseases. In this study, a europium metal organic framework (Eu-MOF) fluorescence probe was prepared, which exhibited a strong fluorescence emission at 614 nm upon excitation at 320 nm, with a high quantum yield of 8.11%. The red fluorescence of the probe could be effectively quenched by BPO through the inner filter effect (IFE) and photoinduced electron transfer (PET) mechanism. The detection process offered several advantages, including a wide linear range of 0–0.95 mM, a low detection limit of 66 nM and a fast fluorescence response of 2 min. Furthermore, an intelligent detection platform was designed to enhance the practical application of the detection method. This platform combined the portability and visuality of a traditional test strip with the color recognition capability of a smartphone, allowing for the visualization and quantitative detection of BPO in a convenient and user-friendly manner. The detection platform was successfully applied to the analysis of BPO in real flour samples with satisfactory recoveries (99.79%–103.94%), suggesting a promising strategy for the rapid and on-site detection of BPO in food samples.

Constructing boronate-bridged core-satellite gold nanoassembly and its application in high sensitive colorimetric detection of benzoyl peroxide residues in food matrices

Here, a new designed core/satellite gold nanoprobe was developed for detecting trace mount of benzoyl peroxide (BPO) based on its deboronation. This gold nanoassembly (the BE-AuNPs12/65) was constructed via borate ester formation between large 4-mercaptophenylboronic acid (MPBA) modified AuNPs (the MPBA-AuNPs65, as cores) and small dopamine modified AuNPs (the DPA-AuNPs12, as satellites). Particularly, upon addition of BPO, it would trigger the deboronation for the BE-AuNPs12/65 probes accompanying with distinct color changes from blue, purple to wine red, which implied the disassembly of the core/satellite nanostructure after the breakage of carbon to boron chemical bond. By measuring the absorbance ratio at 665 nm and 545 nm, quantification of BPO was achieved in the range of 10.0–100.0 nmol/L, which could also be easily observed by naked eyes. The nanoprobe utilized a boronate deprotection mechanism and the LSPR properties of AuNPs to provide high selectivity for detecting BPO over similar ROS/RNS with the limit of detection as low as 7.2 nmol/L. The practical applicability of this assay was verified through successful determining BPO in flour samples, which demonstrated its great potentials in food safety field.

Colorimetric detection of benzoyl peroxide based on the etching of silver nanoshells of Au@Ag nanorods

A fast, sensitive and high-resolution colorimetric method for sensing benzoyl peroxide (BPO) was proposed by using orange sheath-like Au@Ag nanorods (NRs) as the signal transducer. BPO can oxidize Ag nanoshells on the surface of Au@Ag NRs; the etching of Ag nanoshells changes the aspect ratio of Au nanostructures and causes a red-shift of longitudinal local surface Plasmon resonance (LSPR) peak, resulting in a sharp-contrast multicolor change within 2 min. Under the optimal conditions, the red-shift of longitudinal LSPR peak was in linear with the BPO concentration over the range of 0–100 μmol L−1 with a limit of detection of 0.75 μmol L−1. Furthermore, a simple, inexpensive and portable test kit was designed for the visual detection of BPO. A color variation can be distinguished by naked eyes at a concentration of BPO as low as 20 mg kg−1 in flour samples. The colorimetric sensor shows a great potential application for the rapid and on-site assay of BPO in flour samples.