It was found that Cu nanoclusters could enhance the chemiluminescence (CL) emission from the luminol–hydrogen peroxide system in an alkaline medium.

In the present work, a highly sensitive chemiluminescence (CL) system for determination of trace bisphenol A (BPA) was established. The method was based on the inhibitory effect of luminol CL by BPA on the Cu NCs-enhanced luminol-KMnO 4 CL system for the first time. Water-soluble Cu NCs capped with BSA were synthesized. Under the optimized conditions, the inhibited CL intensity was proportional to the concentration of BPA ranging from 1.0 Â 10 À9 to 1.0 Â 10 À5 mol L À1 , with a detection limit (3s) of 1.2 Â 10 À10 mol L À1 . It indicated that the concentration level is lower by almost 1-3 orders of magnitude compared with alternatives. The relative standard deviation (RSD) of the method was 1.7% with 9 repeated measurements of 1.0 Â 10 À6 mol L À1 BPA. The proposed method has also been applied to determine BPA in water samples with good accuracy and precision. The CL spectra, UV-visible spectroscopy and radical scavengers were conducted to explore the possible mechanism.

A highly sensitive and convenient high-performance liquid chromatography technique coupled with chemiluminescence detection for the simultaneous determination butylated hydroquinone (TBHQ) and butylated hydroxyanisole (BHA) in oil is established. The detection is based on the inhibitory effect on the CL reaction between luminol and potassium ferricyanide in an alkaline medium. Samples were separated through a reverse-phase C18 column using a mobile phase of methanol and water (80: 20, v/v) at a flow rate of 0.5 mL/min. The effects of various parameters including mobile phase, flow rate and chemiluminescence regent were studied. Under optimum conditions, both TBHQ and BHA showed good linear relationships in the range 1 × 10(-7) -1 × 10(-5) g/mL with detection limits of 24 and 33 ng/mL, respectively. The proposed method is simple and sensitive, with low costs. The method was successfully applied for the quantification of TBHQ and BHA in sesame oil. The possible inhibition mechanism is also discussed briefly.

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