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. 2017 Mar 22;7:307. doi: 10.1038/s41598-017-00332-3

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© The Author(s) 2017

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(a) FTIR spectra of 2Nal₂ and Gd-2Nal₂ in the amide I region at 5.0 mg/mL. (b) UV-Vis spectra of 2Nal₂ and Gd-2Nal₂, stained with Congo Red at 0.1 and 1.0 mg/mL. The spectrum of Congo Red is also reported for comparison.