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. 2021 Aug 17;13(8):1278. doi: 10.3390/pharmaceutics13081278

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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The purity and mass measurements of Ang (1—7) and PNA5. (a) Analytical HPLC chromatogram of pure Ang (1—7). (b) Analytical HPLC chromatogram of pure PNA5. (c) Mass spectroscopy spectrum of pure Ang (1—7) shows single charged ion ([MH]⁺: 899.51) and double charged ion ([M+2H]²⁺: 450.87). (d) Mass spectroscopy spectrum of pure PNA5 shows single charged ion ([MH]⁺: 1050.55) and double charged ion ([M+2H]²⁺: 526.08).