Abstract
A novel and simple method for the determination of β-carotene, a carotenoid abundant in plants and fruits, is proposed. Multicommutated flow injection analysis (MCFIA) has been applied as automated flow methodology to the analysis of β-carotene in tropical fruit juices and food supplements, making use of the quenching effect caused by this analyte over glutathione-capped CdTe quantum dots (QDs) fluorescence signal. Under optimized conditions, the method was linear in the range of 0.3–15 μg mL−1, with a detection limit of 0.09 μg mL−1 and relative standard deviations lower than 3%. The determination rate was of about 80 h−1, and results were in good agreement with those provided by both the manufacturer and a chromatographic reference method.
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