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. 2017 Nov 20;7:15867. doi: 10.1038/s41598-017-15724-8

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© The Author(s) 2017

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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(a) Absorption spectra of AgNPs at various volume ratio of aqueous silver salt and Tulsi broth and the inset figure shows the shift in absorption peak with reactant concentration. (b) Absorption spectra of AgNPs at different amount of quercetin mixed in 5 ml aqueous solution of AgNO₃ (concentration 2 mM). The inset figure shows the variation in spectral width with a change in concentration.