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. 2020 Jan 27;68(7):2082–2090. doi: 10.1021/acs.jafc.9b07361

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Characterization of SAP nanogels. (A) Cartoon representation and (B) chemical structures of RADA16, RADA16-Soy1, and RADA16-LPYP nanogels. (C) Biomechanical characterization of RADA16-Soy1 and RADA16-LPYP nanogels via a frequency sweep test (0.1–100 Hz, 1% strain). (D) ThT emission spectra of RADA16-Soy1 and RADA16-LPYP nanogels: their affinity for ThT may be ascribable to the presence of cross-β fibril structures. (E) CD spectrum of RADA16-Soy1 and RADA16-LPYP in solution showing the presence of β-sheet assemblies. (F) FTIR analysis of RADA16-Soy and RADA16-LPYP with peaks at ∼1630 and ∼1695 cm^–1 (amide I region) and 1530 cm^–1 (amide II region) typically associated with β-sheet signatures.