کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1169224 | 960625 | 2008 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Rapid and selective detection of cysteine based on its induced aggregates of cetyltrimethylammonium bromide capped gold nanoparticles Rapid and selective detection of cysteine based on its induced aggregates of cetyltrimethylammonium bromide capped gold nanoparticles](/preview/png/1169224.png)
A detection method of cysteine is reported in this contribution with water-soluble positively charged gold nanoparticles (Au-NPs) that were prepared by seed-mediated method and capped with cetyltrimethylammonium bromide (CTAB). In aqueous medium of pH 4.2, the CTAB-capped Au-NPs display greatly different features from those of generally prepared citrate-coated Au-NPs. It was found that in a medium of high salt concentration, the presence of cysteine could induce aggregation of CTAB-capped Au-NPs, while citrate-coated Au-NPs could get aggregation soon even if without the presence of cysteine. The cysteine-induced aggregates of CTAB-capped Au-NPs display strong plasmon resonance light scattering (PRLS) signals characterized at 566.0 nm when excited by a light beam, and the PRLS intensities of the aggregates are in proportion to the concentration of cysteine in the range of 0.01–0.40 μg mL−1 with the limit of detection (3σ) being 2.9 ng mL−1. No amino acids in the samples interfere with the detection, and cysteine in artificial samples could be detected with the recovery between 95.3% and 105.9%, and R.S.D. is less than 3.6%.
Journal: Analytica Chimica Acta - Volume 626, Issue 1, 19 September 2008, Pages 37–43