期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 85, 期 1-2, 页码 126-130出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/S0925-4005(02)00063-1
关键词
aminorhodamine B; calix[4]arene; optode; photo-induced electron transfer
A fluorescent sodium optode based on a chromoionophore consisting of aminorhodamine B covalently-linked through an amide bond to a calix[4]arene has been developed. The optode, fashioned by incorporation of the chromoionophore into a single component polymer matrix, operates, on the basis of on/off switching of aminorhodamine B fluorescence emission as a result of photo-induced intramolecular electron transfer, the efficiency of which is mediated by the complexation of sodium ions. The fluorescence intensity increased linearly with increasing sodium ion concentration in the range 0.01-2.0 M, exhibiting a three-fold enhancement over this range. The optode provides selectivity for sodium ions compared to potassium ions that is sufficient for clinical determinations of sodium ion concentration. (C) 2002 Published by Elsevier Science B.V.
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