title: Chemical modeling of acid-base properties of soluble biopolymers derived from municipal waste treatment materials.
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.
authors: Department of Chemistry, University of Turin, Via Pietro Giuria 7, I-10125 Torino, Italy. silvia.tabasso@unito.it.
authors: Silvia
authors: S
authors: Tabasso
authors: Department of Chemistry, University of Turin, Via Pietro Giuria 7, I-10125 Torino, Italy. silvia.berto@unito.it.
authors: Silvia
authors: S
authors: Berto
authors: Department of Chemistry, University of Turin, Via Pietro Giuria 7, I-10125 Torino, Italy. rosato.roberta1@gmail.com.
authors: Roberta
authors: R
authors: Rosato
authors: Department of Chemistry, University of Turin, Via Pietro Giuria 7, I-10125 Torino, Italy. janethalicia.tafurmarinos@unito.it.
authors: Janeth Alicia Tafur
authors: JA
authors: Marinos
authors: Department of Chemistry, University of Turin, Via Pietro Giuria 7, I-10125 Torino, Italy. marco.ginepro@unito.it.
authors: Marco
authors: M
authors: Ginepro
authors: Department of Chemistry, University of Turin, Via Pietro Giuria 7, I-10125 Torino, Italy. vincenzo.zelano@unito.it.
authors: Vincenzo
authors: V
authors: Zelano
authors: Department of Chemistry, University of Turin, Via Pietro Giuria 7, I-10125 Torino, Italy. piergiuseppe.daniele@unito.it.
authors: Pier Giuseppe
authors: PG
authors: Daniele
authors: Biowaste Processing, Via XXIV Maggio 25, 37126 Verona, Italy. enzo.montoneri@gmail.com.
authors: Enzo
authors: E
authors: Montoneri
mesh_terms: D001704:Biopolymers / Q000737:chemistry*; D008956:Models, Chemical; D012987:Soil / Q000737:chemistry; D012995:Solubility; D014866:Waste Products
chemical_list: D001704:Biopolymers; D012987:Soil; D014866:Waste Products