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. 2012 Feb 22;7(2):e31957. doi: 10.1371/journal.pone.0031957

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Zhang et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) Representative absorption spectra of AuNRs in cells after 6-hours incubation with 1.875, 3.75, 5 and 7.5 pM AuNRs in culture media. The curves are offset for clarity. (B) Comparison between the minimum detectability of ICP-MS and TSPR peak area calculation in quantifying AuNRs in cells. The Au content in cells is converted to AuNRs number in each cell. The numbers are presented as Mean±SD from three parallel experiments.