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An Efficient Probe for Rapid Detection of Cyanide in Water at Parts per Billion Levels and Naked-Eye Detection of Endogenous Cyanide

Kumari, Namita and Jha, Satadru and Bhattacharya, Santanu (2014) An Efficient Probe for Rapid Detection of Cyanide in Water at Parts per Billion Levels and Naked-Eye Detection of Endogenous Cyanide. In: CHEMISTRY-AN ASIAN JOURNAL, 9 (3). pp. 830-837.

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Official URL: http://dx.doi.org/10.1002/asia.201301390


A new molecular probe based on an oxidized bis-indolyl skeleton has been developed for rapid and sensitive visual detection of cyanide ions in water and also for the detection of endogenously bound cyanide. The probe allows the naked-eye detection of cyanide ions in water with a visual color change from red to yellow ((max)=80nm) with the immediate addition of the probe. It shows high selectivity towards the cyanide ion without any interference from other anions. The detection of cyanide by the probe is ratiometric, thus making the detection quantitative. A Michael-type addition reaction of the probe with the cyanide ion takes place during this chemodosimetric process. In water, the detection limit was found to be at the parts per million level, which improved drastically when a neutral micellar medium was employed, and it showed a parts-per-billion-level detection, which is even 25-fold lower than the permitted limits of cyanide in water. The probe could also efficiently detect the endogenously bound cyanide in cassava (a staple food) with a clear visual color change without requiring any sample pretreatment and/or any special reaction conditions such as pH or temperature. Thus the probe could serve as a practical naked-eye probe for in-field experiments without requiring any sophisticated instruments.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the WILEY-V C H VERLAG GMBH, GERMANY
Keywords: colorimetric probes; cyanide; Michael addition; oxidation; sensors
Department/Centre: Division of Chemical Sciences > Organic Chemistry
Division of Information Sciences (Doesn't exist now) > BioInformatics Centre
Date Deposited: 11 Apr 2014 09:55
Last Modified: 11 Apr 2014 09:55
URI: http://eprints.iisc.ac.in/id/eprint/48832

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