Fluorescent Recognition of Potassium and Calcium Ions Using Functionalised CdSe/ZnS Quantum Dots

Narinder Singh, Ray C. Mulrooney, Navneet Kaur, John F. Callan

Research output: Contribution to journal › Article

19 Citations (Scopus)

Abstract

Schiff base receptor 1a has been synthesised and attached to the surface of preformed CdSe/ZnS Quantum Dots (QDs) to form QD-conjugate 2a. While 1a was determined to be selective for Mg2+, 2a demonstrated selectivity for both K+ and Ca2+ when tested against a range of physiologically and environmentally relevant cations by changes in the fluorescence spectra. Thus, the nanoparticle surface functions as a scaffold for the organisation of receptors enabling semi-selective binding. The fluorescence response was shown to be linear between 15-50 mu M for K+ and 2-35 mu M for Ca2+. It was also demonstrated that 2a could measure both K+ and / or Ca2+ in solutions containing both ions.
LanguageEnglish
Pages777-782
JournalJournal of Fluorescence
Volume19
Issue number5
DOIs
Publication statusPublished - Sep 2009

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Semiconductor quantum dots
Potassium
Fluorescence
Ions
Calcium
Schiff Bases
Scaffolds
Cations
Nanoparticles

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Singh, Narinder ; Mulrooney, Ray C. ; Kaur, Navneet ; Callan, John F. / Fluorescent Recognition of Potassium and Calcium Ions Using Functionalised CdSe/ZnS Quantum Dots. In: Journal of Fluorescence. 2009 ; Vol. 19, No. 5. pp. 777-782.
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Singh, N, Mulrooney, RC, Kaur, N & Callan, JF 2009, 'Fluorescent Recognition of Potassium and Calcium Ions Using Functionalised CdSe/ZnS Quantum Dots', Journal of Fluorescence, vol. 19, no. 5, pp. 777-782. https://doi.org/10.1007/s10895-009-0474-y

Fluorescent Recognition of Potassium and Calcium Ions Using Functionalised CdSe/ZnS Quantum Dots. / Singh, Narinder; Mulrooney, Ray C.; Kaur, Navneet; Callan, John F.

In: Journal of Fluorescence, Vol. 19, No. 5, 09.2009, p. 777-782.

Research output: Contribution to journal › Article

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AU - Mulrooney, Ray C.

AU - Kaur, Navneet

AU - Callan, John F.

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N2 - Schiff base receptor 1a has been synthesised and attached to the surface of preformed CdSe/ZnS Quantum Dots (QDs) to form QD-conjugate 2a. While 1a was determined to be selective for Mg2+, 2a demonstrated selectivity for both K+ and Ca2+ when tested against a range of physiologically and environmentally relevant cations by changes in the fluorescence spectra. Thus, the nanoparticle surface functions as a scaffold for the organisation of receptors enabling semi-selective binding. The fluorescence response was shown to be linear between 15-50 mu M for K+ and 2-35 mu M for Ca2+. It was also demonstrated that 2a could measure both K+ and / or Ca2+ in solutions containing both ions.

AB - Schiff base receptor 1a has been synthesised and attached to the surface of preformed CdSe/ZnS Quantum Dots (QDs) to form QD-conjugate 2a. While 1a was determined to be selective for Mg2+, 2a demonstrated selectivity for both K+ and Ca2+ when tested against a range of physiologically and environmentally relevant cations by changes in the fluorescence spectra. Thus, the nanoparticle surface functions as a scaffold for the organisation of receptors enabling semi-selective binding. The fluorescence response was shown to be linear between 15-50 mu M for K+ and 2-35 mu M for Ca2+. It was also demonstrated that 2a could measure both K+ and / or Ca2+ in solutions containing both ions.

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Singh N, Mulrooney RC, Kaur N, Callan JF. Fluorescent Recognition of Potassium and Calcium Ions Using Functionalised CdSe/ZnS Quantum Dots. Journal of Fluorescence. 2009 Sep;19(5):777-782. https://doi.org/10.1007/s10895-009-0474-y

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