Modification of Silica and Cellulose Surface by Polyhexamethyleneguanidine Hydrochloride and Its Determination O.O. Siryk†, V.N. Losev‡, S.L. Didukh‡, E. V. Elsuf'ev‡, A.K. Trofimchuk*§
	* Corresponding authors † F.D. Ovcharenko Institute of Bio-Colloid Chemistry of NAS of Ukraine, Kyiv, Vernadsky Ave, 42, 03142, Ukraine; ‡ Kristall Research and Engineering Center, Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk, 660041 Russia; § Taras Shevchenko National University of Kyiv, Kyiv, 12, Lva Tolstogo str, 01033 Ukraine; *e-mail: aktrof@ernv.biz
	Methods Objects Chem. Anal., 2018, 13(2), p. 71-78 https://doi.org/10.17721/moca.2018.71-78
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Abstract

The adsorption of polyhexamethyleneguanidine hydrochloride (PHMG HC) from aqueous solutions on silica and crystalline cellulose (CC) surfaces in batch and dynamic modes have been studied. The formation of PHMGC sorbates is due to аn interaction of highly basic amino groups of PНMGС (pKa = 13.5), which are protonated in wide range pH and capable of forming hydrogen bonds with a hydroxylated surface. Quantitative sorption of PGMGH on silica gels occurs in the pH range 2-8 while on CC – only in the pH range 6-9. This difference in PHMGC sorption behavior can be explained by different bond strengths, since the pKa of silica gel hydroxyl groups is 7.1, and CC is 10, 12 – for the secondary groups and 14 – for the primary groups. By a capillary electrophoresis method, it has been shown that there is a tendency for more "light" polyguanidine oligomers to concentrate on silica, with their subsequent displacement by more "heavy" oligomers that do not desorb even from concentrated HCl solutions. Sorption of PHMGC on cellulose, unlike silica, is completely reversible. The use of cellulose for preconcentration of PHMGC with its subsequent determination in a sorbent phase by sorptionphotometric, colorimetric and test-methods, as well as photometric method in solution after desorption (limit of detection = 0.012 mg/l) is proposed.

Keywords: silica, cellulose, sorption, polyhexamethyleneguanidine hydrochloride, photometry

Article language: Rus