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. 2019 Aug 9;10:3590. doi: 10.1038/s41467-019-11524-y

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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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Fig. 3 — Characterization of polypeptides synthesized from ROP of Glu-NCA initiated by DMEA in the presence of 1,3-Bis-HFAB catalyst. a plots of [Glu-NCA]₀/[DMEA]₀ vs M_n,SEC and [Glu-NCA]₀/[DMEA]₀ vs Đ; b SEC traces of obtained polypeptides (Table 1, runs 1–5, solid and dash lines represents RI and MALS responses, respectively); c ¹H NMR spectrum of PBLG₁₀ (500 M, 25 °C, CDCl₃/CF₃COOD = 2, the M_n,calcd is 2192 and the M_n,_NMR calculated based on the integral ratio of H^g/H^b is 2302; d MALDI-TOF MS spectrum of PBLG₁₅ (the chain-end was capped with trifluoroacetyl group by using trifluoroacetic anhydride). (Source data are provided as a Source Data file)