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. 2014 Apr 2;12(4):1959–1976. doi: 10.3390/md12041959

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© 2014 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 license (http://creativecommons.org/licenses/by/3.0/).

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Chemical structures of natural polymeric 3-alkylpyridinium salts (poly-APS) and the synthetic poly-APS investigated. Molecular weights: natural poly-APS, 5.52 kDa; APS3, 1.46 kDa; APS7, 2.33 kDa; APS8, 11.9 kDa; APS12, 12.5 kDa; APS12-2, 14.7 kDa; APS12-3, 6.08 kDa.