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. 2015 May 14;5:10163. doi: 10.1038/srep10163

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Copyright © 2015, Macmillan Publishers Limited

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(a) Schematic of the homo-base strand types and combinations studied. Stars denote the detected Ag⁺-bridged duplexes. (b) Example of isotope peak envelope resolved in MS for C₁₁-(Ag⁺)₁₁-C₁₁. Black lines: data. The total mass of the ionized species (m) is given by m = m_DNA + m_AgN_Ag – n_pr, where m_DNA is the mass of the unionized DNA strand, m_AgN_Ag is the mass of the total silver content, and n_pr is the number of protons removed by negative mode electrospray ionization. The charge state, z (negative) of the ionized species is z = Q_Ag/e – n_pr, where Q_Ag is the total charge associated with the silver content. Bars show the calculated isotope peak patterns for a net charge on the silver content of Q_Ag = +10e (blue), +12e (green)(insets) and +11e (red) associated with the silver atom content. The best fit at a charge of +11e confirms that all of the attached silver atoms are cations, Ag⁺.