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Int. J. Mol. Sci. 2015, 16(2), 3405-3418; doi:10.3390/ijms16023405

Chemical Modeling of Acid-Base Properties of Soluble Biopolymers Derived from Municipal Waste Treatment Materials

1
Department of Chemistry, University of Turin, Via Pietro Giuria 7, I-10125 Torino, Italy
2
Biowaste Processing, Via XXIV Maggio 25, 37126 Verona, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: James H. Clark
Received: 23 December 2014 / Revised: 22 January 2015 / Accepted: 29 January 2015 / Published: 4 February 2015
(This article belongs to the Special Issue Green Chemistry and the Biorefinery)
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Abstract

This work reports a study of the proton-binding capacity of biopolymers obtained from different materials supplied by a municipal biowaste treatment plant located in Northern Italy. One material was the anaerobic fermentation digestate of the urban wastes organic humid fraction. The others were the compost of home and public gardening residues and the compost of the mix of the above residues, digestate and sewage sludge. These materials were hydrolyzed under alkaline conditions to yield the biopolymers by saponification. The biopolymers were characterized by 13C NMR spectroscopy, elemental analysis and potentiometric titration. The titration data were elaborated to attain chemical models for interpretation of the proton-binding capacity of the biopolymers obtaining the acidic sites concentrations and their protonation constants. The results obtained with the models and by NMR spectroscopy were elaborated together in order to better characterize the nature of the macromolecules. The chemical nature of the biopolymers was found dependent upon the nature of the sourcing materials. View Full-Text
Keywords: biopolymers; biowastes; chemical model; potentiometry; protonation constants; NMR biopolymers; biowastes; chemical model; potentiometry; protonation constants; NMR
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Tabasso, S.; Berto, S.; Rosato, R.; Marinos, J.A.T.; Ginepro, M.; Zelano, V.; Daniele, P.G.; Montoneri, E. Chemical Modeling of Acid-Base Properties of Soluble Biopolymers Derived from Municipal Waste Treatment Materials. Int. J. Mol. Sci. 2015, 16, 3405-3418.

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