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Albumin coated CuInS2 quantum dots as a near-infrared fluorescent probe for NADH, and their application to an assay for pyruvate |
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| Authors: | Siyu Liu Fanping Shi Lu Chen Xingguang Su |
| Affiliation: | 1. Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun, 130012, China |
| Abstract: | Water-soluble CuInS2 quantum dots (QDs) stabilized with 3-mercaptopropionic acid were synthesized in aqueous solution and then coated with bovine serum albumin. The resulting particles display fluorescence with a peak at 680 nm that is effectively quenched by 1, 4-dihydro-nicotinamide adenine dinucleotide (NADH), but not by 1, 4-nicotinamide adenine dinucleotide (NAD+). The enzyme lactate dehydrogenase catalyzes the reduction of pyruvate and dehydrogenation of lactic acid using NAD+ or NADH as a cosubstrate. The new QDs were applied to monitor the course of lactate dehydrogenase-catalyzed reaction of pyruvate by detecting NADH via its quenching effect. This resulted in a convenient and selective detection scheme for pyruvate. The detection limit is as low as 25 nM. Bovine serum albumin coated CuInS2 quantum dots (QDs) are quenched by 1,4- dihydronicotinamide adenine dinucleotide (NADH) that could react with pyruvic acid and lactate dehydrogenase. Therefore, the CuInS2 QDs could be used to detect pyruvic acid. |
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