Journal
TALANTA
Volume 82, Issue 2, Pages 444-449Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2010.01.016
Keywords
Ninhydrin; Thiol-reactive solid; Penicillamine; Aminothiol
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While aminothiols produce weak purple-colored reactions with ninhydrin, we demonstrate for the first time that this color could be intensely developed. Using a D-penicillamine paradigm, adsorption of this compound via a disulfide bond onto thiol-reactive solid prior to ninhydrin reaction allowed spectrophotometrical monitoring of the supernatant at 570 nm. Compared with off-solid method, this approach expanded the linear concentration range to 50-600 mu g mL(-1) and enhanced the sensitivity so that D-penicillamine with the concentrations of less than 100 mu g mL(-1) could be accurately quantitated by using a second-order polynomial calibration curve. Additionally, this assay was unaffected by disulfide adduct interference, highlighting its potential for the analysis of D-penicillamine as well as other aminothiols. (C) 2010 Elsevier B.V. All rights reserved.
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