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Spectrochim Acta A Mol Biomol Spectrosc. 2012 Dec;98:275-81. doi: 10.1016/j.saa.2012.08.016. Epub 2012 Aug 19.

Determination of amantadine and rimantadine using a sensitive fluorescent probe.

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Analytical and Testing Center, Shanxi Normal University, Linfen, Shanxi 041004, PR China.


Amantadine hydrochloride (AMA) and rimantadine hydrochloride (RIM) are non-fluorescent in aqueous solutions. This property makes their determination through direct fluorescent method difficult. The competing reactions and the supramolecular interaction mechanisms between the two drugs and coptisine (COP) as they fight for occupancy of the cucurbit[7]uril (CB[7]) cavity, were studied using spectrofluorimetry, (1)H NMR, and molecular modeling calculations. Based on the significant quenching of the supramolecular complex fluorescence intensity, a fluorescent probe method of high sensitivity and selectivity was developed to determine AMA or RIM in their pharmaceutical dosage forms and in urine samples with good precision and accuracy. The linear range of the method was from 0.0040 to 1.0 μg mL(-1) with a detection limit ranging from 0.0012 to 0.0013 μg mL(-1). This shows that the proposed method has promising potential for therapeutic monitoring and pharmacokinetics and for clinical application.

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