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Open AccessArticle

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

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Department of Chemistry, Materials and Chemical Engineering “G. Natta”, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy
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Leibniz-Institut für Katalyse e. V., Albert-Einstein-Straße 29, 18059 Rostock, Germany
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Dipartimento di Agraria, Università degli Studi di Sassari, Viale Italia, 39, 07100 Sassari, Italy
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Department of Chemistry and Pharmacy, via Vienna 2, University of Sassari, 07100 Sassari, Italy
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School of Chemistry, Cardiff University, Park Place, Cardiff CF10 3AT, UK
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Authors to whom correspondence should be addressed.
Resources 2019, 8(2), 108; https://doi.org/10.3390/resources8020108
Received: 16 May 2019 / Revised: 30 May 2019 / Accepted: 5 June 2019 / Published: 10 June 2019
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 1H 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. View Full-Text
Keywords: waste cooking oil; nuclear magnetic resonance; headspace solid-phase microextraction; thermogravimetry; principal components analysis; X-ray diffraction waste cooking oil; nuclear magnetic resonance; headspace solid-phase microextraction; thermogravimetry; principal components analysis; X-ray diffraction
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Mannu, A.; Vlahopoulou, G.; Urgeghe, P.; Ferro, M.; Del Caro, A.; Taras, A.; Garroni, S.; Rourke, J.P.; Cabizza, R.; Petretto, G.L. Variation of the Chemical Composition of Waste Cooking Oils upon Bentonite Filtration. Resources 2019, 8, 108.

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