Doughty MJ. Fluorescence characteristics of sodium fluorescein-rose bengal ophthalmic solution mixtures.
Cont Lens Anterior Eye 2014;
37:358-62. [PMID:
25042814 DOI:
10.1016/j.clae.2014.05.006]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Revised: 03/31/2014] [Accepted: 05/19/2014] [Indexed: 10/25/2022]
Abstract
PURPOSE
To assess fluorescence emission properties of sodium fluorescein-rose bengal mixtures in buffered aqueous solution.
METHODS
Solutions of sodium fluorescein (NaFl) or rose bengal (RB) or mixtures of these two chemicals were prepared over a range of dilutions in 1% NaCl with 10mM phosphate buffer to give a pH of 7.5 at room temperature. Absorbance and fluorescence spectra were recorded in 10mm path length cuvettes.
RESULTS
The fluorescence emission from NaFl extends between 480 and nearly 600nm, a spectral range that is also covered by the absorbance of RB (between 500 and 580nm). With very dilute solutions of NaFl (less than 0.002%), an apparent total quenching of its fluorescence can occur in the presence of 0.01% RB, with a proportionate decrease at lower concentrations of RB.
CONCLUSIONS
The presence of RB in an aqueous solution of NaFl at physiological pH appears to act in a similar way to a barrier filter, resulting in the quenching of the measurable fluorescence from NaFl. It remains to be established how substantial or significant such an effect might be if a mixture of NaFl and RB as used as part of the examination of the external eye.
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