Selective detection of Al3+ and citric acid with a fluorescent amphiphile

An amphiphilic fluorescent dye with a disulfonated BODIPY head group and a heptadecyl side chain is described. In buffered aqueous solution, the amphiphile can form aggregates with a critical micelle concentration of similar to 20 mu M. The aggregation of the dye is associated with a strong quenching of its fluorescence. Al3+ promotes aggregation, whereas other metal ions have a much smaller effect, in particular when histidine is added as masking agent. The Al3+-induced aggregation can be used to sense Al3+ in the low micromolar concentration range with high selectivity. Furthermore, we demonstrate that a dye-Al3+ mixture can be used as a sensing ensemble for the detection of citric acid. The assay allows quantifying the citric acid content of commercial beverages such as energy drinks.


Published in:
Organic & Biomolecular Chemistry, 13, 1, 252-257
Year:
2015
Publisher:
Cambridge, Royal Society of Chemistry
ISSN:
1477-0520
Laboratories:


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 Record created 2015-02-20, last modified 2018-03-17

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