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. 2021 Apr 23;13(9):1382. doi: 10.3390/polym13091382

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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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(a) Effect of linear velocity of ink extrusion on the width of printed line of 1%(w/v) chitosan-Ph ink containing 4 mM SPS and 1 mM Ru(bpy)₃, Bars: 300 µm. (b) Relationship between line width and linear velocity of ink extrusion at different SPS concentration (2, 4 and 10 mM). Bars: mean ± SD (n = 10). (c) Effect of SPS concentration on the shape of printed chitosan-Ph hydrogel constructs based on a blue print (left) from 1%(w/v) chitosan-Ph ink containing 1 mM Ru(bpy)₃ and 2–7 mM of SPS. Bars: 5 mm.