Citation:
XU Ning-Ning, ZHANG Qin, GUO Wei, LI Qin-Tao, XU Jie. Au@PVP Core-Shell Nanoparticles Used as Surface-Enhanced Raman Spectroscopic Substrate to Detect Malachite Green[J]. Chinese Journal of Analytical Chemistry,
;2016, 44(9): 1378-1384.
doi:
10.11895/j.issn.0253-3820.160126
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The core-shell nanopaticles of Au@polyvinyl-pyrrolidone (PVP) with uniform size and controllabe shell-thickness were prepared by hydrothermal method. The core-shell nanoparticles could be assembled to be the monolayer array on Si substrate relying on the dispersion of core-shell nanoparticles arising from PVP shell. The malachite green (MG) absorbed by H-bond could be detected on the array under the electromagnetic enhancement of inner-core Au nanoparticles. Under the conditions of the optimum shell-thickness of Au@PVP and the appropriate absorbed time of MG, the detection of MG could be realized in the linear range from 1×10-10 mol/L to 1×10-5 mol/L with the correlation coefficient (R2) of 0.98. The detection limit was 10-12 mol/L. This method was applied to the determination of MG in tilapia fish fillets of Xiagang market. No MG was found in this real sample. The spiked recoveries of the sample ranged from 70.8% to 126.0%.This method is simple and accurate, and can be used for detection of MG in the fish.
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