Variation of the Chemical Composition of Waste Cooking Oils upon Bentonite Filtration

Alberto Mannu, Gina Vlahopoulou, Paolo Urgeghe, Monica Ferro, Alessandra Del Caro, Alessandro Taras, Sebastiano Garroni, Jonathan P. Rourke, Roberto Cabizza and Giacomo L. Petretto
Additional contact information
Alberto Mannu: Department of Chemistry, Materials and Chemical Engineering “G. Natta”, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy
Gina Vlahopoulou: Department of Chemistry, Materials and Chemical Engineering “G. Natta”, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy
Paolo Urgeghe: Dipartimento di Agraria, Università degli Studi di Sassari, Viale Italia, 39, 07100 Sassari, Italy
Monica Ferro: Department of Chemistry, Materials and Chemical Engineering “G. Natta”, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy
Alessandra Del Caro: Dipartimento di Agraria, Università degli Studi di Sassari, Viale Italia, 39, 07100 Sassari, Italy
Alessandro Taras: Department of Chemistry and Pharmacy, via Vienna 2, University of Sassari, 07100 Sassari, Italy
Sebastiano Garroni: Department of Chemistry and Pharmacy, via Vienna 2, University of Sassari, 07100 Sassari, Italy
Jonathan P. Rourke: School of Chemistry, Cardiff University, Park Place, Cardiff CF10 3AT, UK
Roberto Cabizza: Dipartimento di Agraria, Università degli Studi di Sassari, Viale Italia, 39, 07100 Sassari, Italy
Giacomo L. Petretto: Dipartimento di Agraria, Università degli Studi di Sassari, Viale Italia, 39, 07100 Sassari, Italy

Resources, 2019, vol. 8, issue 2, 1-15

Abstract: The chemical composition and the color of samples of waste cooking oils (WCOs) were determined prior to and after filtration on two different pads of bentonite differing in particle size. The volatile fraction was monitored by headspace solid-phase microextraction (HS-SPME) coupled with gas-chromatography, while the variation of the composition of the main components was analyzed by 1 H NMR. Both techniques allowed the detection of some decomposition products, such as polymers, terpenes, and derivatives of the Maillard process. The analysis of the chemical composition prior to and after bentonite treatment revealed a tendency for the clays to retain specific chemical groups (such as carboxylic acids or double bonds), independent of their particle size. A pair comparison test was conducted in order to detect the sensory differences of the intensity of aroma between the WCO treated with the two different bentonites. In addition, characterization of the bentonite by means of powder X-ray diffraction (XRD) and thermogravimetric measurements (TG) was performed.

Keywords: waste cooking oil; nuclear magnetic resonance; headspace solid-phase microextraction; thermogravimetry; principal components analysis; X-ray diffraction (search for similar items in EconPapers)
JEL-codes: Q1 Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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