Abstract
The present study suggested three different highly sensitive luminescent systems based on the employment of silver nanoparticles (NPs), copper oxide nanoparticles and gold nanoparticles in the presence of micellar medium sodium dodecyl sulfate (SDS) for the detection of ascorbic acid in some fruit juices. The fluorescence spectral behavior of ascorbic acid was detected at lambda(em)of 420 nm after lambda(ex)at 350 nm in the presence of acetate buffer (pH 3). Under optimized experimental conditions, the suggested spectroflourimetric systems displayed excellent linearity over concentration ranges of 1.0 x 10(-9)-1.0 x 10(-2), 1.0 x 10(-7)-1.0 x 10(-3)and 1.0 x 10(-6)-1.0 x 10(-3)M with lower limits of detection of 1.0 x 10(-10), 5 x 10(-8)and 5 x 10(-7)M for SDS-AgNPs, SDS-CuONPs and SDS-AuNPs systems, respectively. The suggested approaches were successfully used to detect ascorbic acid in its bulk powder and in some commercial fruit juices.