Development of a ruthenium(II) complex-based luminescence probe for detection of hydrogen sulfite in food samples

Abstract

Development of new methods for rapid and effective detection of hydrogen sulfite is of great importance in the studies of this species in food samples. In this contribution, a ruthenium(II) complex-based luminescence probe, Ru-CHO, was developed for fast, highly sensitive and selective recognition and detection of hydrogen sulfite. Ru-CHO was found to be weakly luminescent due to the intramolecular charge transfer dominated by the strong electron withdrawing aldehyde groups. In the presence of hydrogen sulfite, the aldehyde groups in Ru-CHO can specifically react with hydrogen sulfite, which results in the formation of a new ruthenium(II) complex Ru-SO, to lead to the remarkable luminescence enhancement. The recognition reaction was found to be completed in a few seconds, and the dose-dependent increase in luminescence intensity showed good linearity against the hydrogen sulfite concentration, suggested the availability of Ru-CHO for the rapid quantification of hydrogen sulfite in aqueous media. Hydrogen sulfite promoted reaction of Ru-CHO was confirmed by ESI-MS and 1 H NMR analysis, and the photophysical properties, luminescence changes and the electronic transitions in Ru-CHO and Ru-SO were validated by density functional theory (DFT)/time-dependent DFT (TDDFT) calculations. Ru-CHO was successfully used for the quantitative detection of hydrogen sulfite in wine and sugar samples, which validated the practical applicability of Ru-CHO as a luminescence probe for the detection of hydrogen sulfite in food samples.

Determination and Imaging of Small Biomolecules and Ions Using Ruthenium(II) Complex-Based Chemosensors

“…In a later study, Zhang et al found that the nucleophilic addition of aldehyde can also be triggered by hydrogen sulfite (HSO 3 − ) in acidic buffer [ 24 ], thus allowing complex 9 to be used as a chemosensor for HSO 3 − detection in phosphate-buffered saline (PBS) buffer (50 mM, pH = 5) (Fig. 7 ) [ 101 ]. The reaction of HSO 3 − and complex 9 led to the formation of 9-SO , accompanied by an increase of luminescence at 620 nm.…”

Determination and Imaging of Small Biomolecules and Ions Using Ruthenium(II) Complex-Based Chemosensors

“…7 Molecular structures of Ru(II) complexes 9 and 10 and their reactions with HSO 3 − and CN − , respectively thus allowing complex 9 to be used as a chemosensor for HSO 3 − detection in phosphate-buffered saline (PBS) buffer (50 mM, pH = 5) (Fig. 7) [101]. The reaction of HSO 3 − and complex 9 led to the formation of 9-SO, accompanied by an increase of luminescence at 620 nm.…”

Antioxidant and Cytotoxic Activity of Essential Oils and Their Principal Components: Spectrophotometric, Voltammetric, and Theoretical Investigation of the Chelating Effect of Eugenol and Carvacrol

“…Several theoretical studies have already been performed regarding the chemical issues in foods and their processes. − Serobatse and Kabanda have performed a theoretical study on the antioxidant properties of two chalcone derivatives, that is, kanakugiol and pedicellin, toward the ability to coordinate with Fe­(II) and Fe­(III). Medine et al have experimentally and theoretically studied the structures and antimutagenic effects of vanadium with chelating flavonoids.…”