Abstract
Two methods for the luminescence determination of cysteine (Cys) are presented. They make use of either silver nanoparticles (Ag NPs) or graphene quantum dots (GQDs), both doped with terbium(III). The methods are based on the finding thatCys quenches the green luminescence of Tb(III)-Ag NPs and Tb(III)-GQDs. The excitation/emission maxima are at 306/545 and 257/545nm, for both nanoprobes, respectively. Response is linear in the 0.28-5.0μgmL-1 Cys concentration range for the Tb(III)-Ag NP system, and from 0.05-3.0μgmL-1 for the Tb(III)-GQD system. The respective limits of detection are 0.09 and 0.015μgmL-1. The probes were applied to the time-resolved luminometricdetermination of Cys in (spiked) food supplements and gave satisfactory results. Graphical abstractSchematic representation of the quenching by cysteine (Cys) of the time-resolved luminescence (TSL) of terbium-graphene quantum dots [Tb(III)-GQD] and ofterbium-silver nanoparticles [Tb(III)-Ag NP].
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