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Smartphone Nano-Colorimetric Determination of Hydrogen Sulfide in Biosamples After Silver-Gold Core-Shell Nanoprism-Based Headspace Single-Drop Microextraction Sheng Tang, Tong Qi, Dasha Xia, Mengchan Xu, Mengyuan Xu, Anni Zhu, Wei Shen, and Hian Kee Lee Anal. Chem., Just Accepted Manuscript • DOI: 10.1021/acs.analchem.9b00255 • Publication Date (Web): 15 Apr 2019 Downloaded from http://pubs.acs.org on April 15, 2019
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Analytical Chemistry
Smartphone Nano-Colorimetric Determination of Hydrogen Sulfide in Biosamples After Silver-Gold Core-Shell Nanoprism-Based Headspace Single-Drop Microextraction Sheng Tanga,*, Tong Qia, Dasha Xia a, Mengchan Xua, Mengyuan Xua, Anni Zhua, Wei Shena, Hian Kee Leeb,c,d,* aSchool
of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu Province, PR China bDepartment of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore cNational University of Singapore Environmental Research Institute, T-Lab Building #02-01, 5A Engineering Drive 1, Singapore 117411, Singapore dTropical Marine Science Institute, National University of Singapore, S2S Building, 18 Kent Ridge Road, Singapore 119227, Singapore
Corresponding authors’ e-mail addresses:
[email protected] (S. Tang);
[email protected] (H.K. Lee) Abstract: In this work, sensitive detection of hydrogen sulfide (H2S) was realized at low cost and high efficiency through the application of silver-gold core-shell nanoprism (Ag@Au-np) combined with headspace-single drop microextraction (HS-SDME). After SDME, smartphone nano-colorimetry (SNC), with the aid of a smartphone camera and a colour picker software, was used to detect and quantify the H2S. The method took advantage of the inhibition of the ultraviolet-visible (UV-vis) signal caused by H2S etching of the Ag@Au-np pre-added to the SDME solvent, to measure the H2S concentration. The coating of the gold layer not only ensured the high stability of the nanomaterial, but also enhanced the selectivity towards H2S. The HS-SDME method was simple to process and only required a droplet of solvent for analysis to be realized. This HS-SDME-SCN approach exhibited a calibration graph linearity of between 0.1 and 100 μM, and a limit of detection of 65 nM. (relative standard deviations of N % (n=3)
