Funan Chen

In this study, non‐stoichiometric molybdenum oxide/prussian blue nanocomposites (MoO _3−x /PB NCs) were synthesized via a simple one‐pot method. The MoO _3−x /PB NCs can catalyze the conversion of dissolved oxygen into reactive oxygen species (ROS), generating chemiluminescence (CL) without additional oxidants. Meanwhile, compared with the original alkaline luminol solutions, it significantly enhances the CL signal, with an increase of over 1000‐fold. Utilizing the CL intensity‐quenching capability of HQ, a highly sensitive CL sensor has been developed. The linear range was 10–500 nmol·L ⁻¹ and the detection limit (LOD) was 1 nmol·L ⁻¹ , along with excellent selectivity and anti‐interference capability. At the same time, this study not only provided a new strategy for detecting HQ in lake and tap water but also expanded the application potential of MoO _3−x /PB NCs in CL analysis.

Nickel hydroxide nanoflakes incorporating amorphous nickel oxyhydroxide (NiOOH/Ni(OH)₂ NFs) were synthesized through a chemical oxidation approach. NiOOH/Ni(OH)₂ NFs maintains the two-dimensional structure of Ni(OH)₂ nanoflakes with an enlarged specific surface area. Furthermore, the amorphous NiOOH possesses abundant high-valence nickel active sites, endowing the material with remarkable oxidase-like activity. This catalytic property enabled the generation of reactive oxygen species (ROS) from dissolved oxygen, enhancing the luminol chemiluminescence (CL) intensity by over 2,000-fold without requiring external oxidants. Mn²⁺ significantly quenched the CL signal by scavenging ROS, enabling a linear detection range of 1 − 30 μmol·L⁻¹ and a detection limit of 0.60 μmol·L⁻¹, which is threefold lower than the World Health Organization (WHO) permissible limit (1.80 μmol·L⁻¹) for drinking water. The sensor was successfully applied to tap and lake water samples, demonstrating simplicity, rapid response, and high selectivity, making it a promising method for environmental monitoring. Graphical Abstract

MoO_3-x NPs was rapidly synthesized at room temperature by an easy stirring method. It was interesting to find that MoO_3-x NPs induce OH⁻ to generate active free radicals (ROS), which is a highly promising property in chemiluminescence (CL). Benefiting from the abundant oxygen vacancy, MoO_3-x NPs adsorbs H₂O₂ and turn it into ·OH. The oxidase activity of fluorescein under visible light had already been reported, which catalyzes dissolved oxygen to become O₂⁻· and continue to convert to H₂O₂. By creating the synergy effect with fluorescein, MoO_3-x NPs strengthen the CL intensity of K₃[Fe(CN)₆]-fluorescein system significantly. Utilizing the quench effect of uric acid for the CL intensity, we developed a rapid, simple, and highly sensitive CL platform for uric acid detection. The linear range was 5–80 µM and the detection limit (LOD) for uric acid was 3.11 µM (S/N = 3). This work expanded the application of MoO_3-x NPs in the CL field and developed a simple and highly sensitive CL sensing system to detect UA in human saliva. Graphical Abstract

Potassium ferricyanide (K₃(Fe(CN)₆)) could directly oxidize silicon quantum dots (Si QDs) to generate chemiluminescence (CL) under alkaline conditions. It was noteworthy that in the Si QDs–K₃(Fe(CN)₆)–NaOH CL system, the Si QDs worked as a new luminescent material. In addition, the signal intensity of this CL system could be weakened with the addition of uric acid (UA). Based on these, we exploited a new easy and convenient determination method of UA. This method only needed filtration and dilution of UA, without other pretreatment. The constructed system exhibited a linear relationship that ranged from 0.50 to 4.50 mmol·L⁻¹, with 0.24 mmol·L⁻¹ of detection limit, and this system had successfully demonstrated the detection of UA in human urine. In addition, this work also broaden the application of the Si QDs in CL research.

In this paper, a novel chemiluminescence (CL) system was introduced based on the use of CdTe quantum dots (QDs) with the mixture solutions of fluorescein and potassium periodate (KIO₄) in alkaline medium. The CL signal of an ultra‐weak system was strongly enhanced in the presence of QDs. The application of CdTe QDs–fluorescein–KIO₄ system is reported for the first time. It was found that catechol had a diminishing effect on the CL reaction. Under optimal experimental conditions, CL intensity decreased linearly in a 1 to 100 μM catechol concentration range, with a 0.18 μM detection limit. A possible reaction mechanism was proposed according to the results of kinetic analyses, CL spectra, ultraviolet–visible and fluorescence spectra. The results pointed to an efficient energy transfer between the CL energy donor CdTe QDs and acceptor fluorescein. Finally, the CL method was successfully applied to the determination of catechol in environmental water samples.

The flow‐injection chemiluminescence (FI‐CL) behavior of a gold nanocluster (Au NC)–enhanced rhodamine B–KMnO₄ system was studied under alkaline conditions for the first time. In the present study, the as‐prepared bovine serum albumin‐stabilized Au NCs showed excellent stability and reproducibility. The addition of trace levels of fluvoxamine maleate (Flu) led to an obvious decline in CL intensity in the rhodamine B–KMnO₄–Au NCs system, which could be used for quantitative detection of Flu. Under optimized conditions, the proposed CL system exhibited a favorable analytical performance for Flu determination in the range 2 to 100 μg ml⁻¹. The detection limit for Flu measurement was 0.021 μg ml⁻¹. Moreover, this newly developed system revealed outstanding selectivity for Flu detection when compared with a multitude of other species, such as the usual ions, uric acid and a section of hydroxy compounds. Additionally, CL spectra, UV–visible spectroscopes and fluorescence spectra were measured in order to determine the possible reaction mechanism. This approach could be used to detect Flu in human urine and human serum samples with the desired recoveries and could have promising application under physiological conditions.

A novel and convenient method based on high-performance liquid chromatography coupled with chemiluminescence (HPLC) for the determination of propyl gallate in edible oil is reported. The detection was based on the inhibition of chemiluminescence between luminol and hydrogen peroxide in alkaline solution. The analysis was performed using a C₁₈ column with isocratic 60:40 methanol/water. Under the optimum conditions, the concentration of propyl gallate was linear from 9 × 10⁻⁶ mol L⁻¹ to 1 × 10⁻⁴ mol L⁻¹ with a detection limit of 2 × 10⁻⁷ mol L⁻¹. The method is simple, sensitive, and inexpensive and was used for the determination of propyl gallate in edible oil.