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. 2019 Mar 21;9:4987. doi: 10.1038/s41598-019-41092-6

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Determination of enthalpy values for PtNPs-ICR-191 interactions: (A) thermograms presenting microcalorimetric titrations of PtNPs with ICR-191 (solid line), buffer with ICR-191 (dashed line) and PtNPs with buffer (dotted line), shown as heat released in time and (B) thermal effects of titrations of PtNPs with ICR-191 (squares), buffer with ICR-191 (circles) and PtNPs with buffer (triangles). Diamonds represent difference between the heat of PtNPs titration with ICR-191 and sum of heats obtained for control titrations (buffer-ICR-191, PtNPs-buffer), and (C) heat of ICR-191-PtNPs interactions (corrected for background thermal effects as described above), calculated as kcal mol⁻¹ of injected ICR-191. The enthalpy change (ΔH) of ICR-191-PtNPs interactions, calculated by the linear regression (r² = 0.95) of experimental points to [ICR-191] tending to zero, is equal to −4.01 ± 0.23 (±SE) kcal mol⁻¹.