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. 2019 Feb 25;9:2679. doi: 10.1038/s41598-019-39093-6

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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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Strong anion-exchange chromatography of Hp and by-products. 200 µg of intact samples were separated by a step increase in concentration of NaCl (1.0, 1.2, 1.4, 1.6, 1.8 and 2 M, the red line is conductance and is an AKTA output with the scale relative to the maximum absorbance peak of the y-axis) at a flow rate of 0.5 ml/min. Samples were detected by UV at 232 nm.