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

International Journal of Molecular Sciences

Silvia Tabasso²  Silvia Berto²  Roberta Rosato²  Janeth Alicia Tafur Marinos²  Marco Ginepro²  Vincenzo Zelano²  Pier Giuseppe Daniele²  Enzo Montoneri¹ 

[1] Biowaste Processing, Via XXIV Maggio 25, 37126 Verona, Italy; E-Mail:;Department of Chemistry, University of Turin, Via Pietro Giuria 7, I-10125 Torino, Italy; E-Mails:

关键词: biopolymers;    biowastes;    chemical model;    potentiometry;    protonation constants;    NMR;   

DOI  :  10.3390/ijms16023405

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.