The properties of nylon as a new material for obtaining room-temperature phosphorescence from p-aminobenzoic acid (PABA) have been investigated. Although PABA shows native phosphorescence when adsorbed on a nylon membrane, a significant improvement in both sensitivity and limit of
detection is achieved in the presence of α-cyclodextrin and heavy atoms. An additional enhancement of the phosphorescence signal is attained when the measurements are carried out under a nitrogen atmosphere. The analytical figures of merit obtained under the best experimental conditions are:
linear calibration range from 0.6 to 6 ng/spot (the lowest value corresponds to the quantitation limit); correlation coefficient, 0.998 for 18 data points; relative standard deviation, 2.2% (n = 5) at a level of 2.4 ng/spot; and limit of detection, 0.2 ng/spot (calculated according to
Departamento de Quimica Analitica, Facultad de Ciencias Bioquimicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531 (2000) Rosario, Argentina
Publication date: July 1, 2004
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The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)