A Surface-Enhanced Resonance Raman Scattering Method for Trace Cystine Using 4-Mercaptopyridine-Aggregated-Nanosilver as Probe
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A stable nanosilver solution was prepared, using PEG10000 as stabilizer and NaBH4 as reducer. In pH 6.6 Na2HPO4-NaH2PO4 buffer solution containing PEG10000 and NaCl, nanosilvers were aggregated to form the stable aggregated-nanosilvers (ANS) that could conjugate with 4-mercaptopyridine (MP) to produce an ANS-MP surface-enhanced resonance Raman scattering (SERRS) probe, which exhibited a strong SERS peak at 1097 cm-1. When cystine (Cy) concentration increased, the SERS intensity at 1097 cm-1 decreased linearly. In the optimal condition, the decreased SERRS intensity was linear to Cy concentration in the range of 5.0×10-9-1.4×10-7 mol/L, with a detection limit of 2.0×10-9 mol/L Cy.
2013 ◽
Vol 299
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pp. 191-194
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2013 ◽
Vol 319
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pp. 157-160
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2001 ◽
Vol 105
(15)
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pp. 3673-3679
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2006 ◽
Vol 789
(1-3)
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pp. 59-70
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1984 ◽
Vol 88
(12)
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pp. 2641-2650
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