Supporting Information

Lead colorimetric assay using unmodified gold nanorods

Guozhen Chen, Yan Jin,* Wenhong Wang, Yina Zhao

Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710062, China

China State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, P.R.China

* Corresponding author: Prof. Yan Jin, Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University
Email: , Fax: 86-29-81530727


Table S1 Comparison of different methods for specific Pb2+ detection.

Method / Detection limit / Selectivity / Response time / Real sample
application
This study / 3 nM / good / 5 min / Yes
Colorimetric1 / 32 nM / good / 40 min / Yes
Colorimetric2 / 10 nM / good / 2.5 min / -
Colorimetric3 / 10 nM / moderate / 16 h / Yes
Colorimetric4 / 3 nM / good / 10 min / Yes
Colorimetric5 / 0.1 μM / good / 5 min / -
Colorimetric6 / 0.5 μM / good / 15 min / Yes
Colorimetric7 / 5 μM / moderate / 40 min / Yes
Colorimetric8 / 5 μM / good / - / -
Colorimetric9 / 1.637 μM / moderate / 15 min / -
Colorimetric10 / 200 nM / good / - / Yes
Colorimetric11 / 1.2 μM / good / - / Yes
Fluorescence12 / 20 nM / good / 10 min / -
Conjugated polymer / 10 nM / moderate / - / Yes
Gel embrane / 5.0 nM / good / - / Yes
Amperometric15 / 0.4 nM / moderate / - / Yes


Fig. S1 Color change of the GNRs and GNRs/DNA solution with different concentrations of Pb2+ ions. (a) GNRs, (b-g) GNRs/ssDNA + Pb2+, the concentration of Pb2+ is 0, 5, 10, 50, 100, 300 nM, respectively.
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