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Monari S, Ferri M, Vannini M, Sisti L, Marchese P, Ehrnell M, Xanthakis E, Celli A, Tassoni A. Cascade strategies for the full valorisation of Garganega white grape pomace towards bioactive extracts and bio-based materials. PLoS One 2020; 15:e0239629. [PMID: 32946525 PMCID: PMC7500587 DOI: 10.1371/journal.pone.0239629] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Accepted: 09/09/2020] [Indexed: 11/19/2022] Open
Abstract
Agro-waste reduction and reuse are among the current main social challenges. In this perspective, the present research was aimed at the complete valorisation of Garganega grape pomace by recovering bioactive phenol extracts and by testing the solid fibre extract residues in composite formulation for packaging applications. The pomace was derived from white wine production, therefore, respect to red pomace, it was promptly removed from must after pressing, and its exploitation can be particularly interesting and valuable as still rich in active compounds. Phenol extracts were obtained both via solvent-based and pressurised liquid extractions and their phytochemical compositions were compared in terms of total amount of phenols, flavonoids, flavanols, anthocyanins, hydroxycinnamic acids, and reducing sugars. Antioxidant activity and detailed phenol profiles were also achieved. The highest phenol yield was obtained via solvent-based extraction with 75% acetone (v/v), solid/liquid ratio 1:5, 2h incubation at 50°C (77.9 gGAeq/kgDW). The fibrous solid residue of the extraction was characterized via thermogravimetric analysis and used for composite preparation by melt mixing with the renewable and biodegradable PHBV polymer through a green approach (solvent-less process). The composites resulted thermally stable at high temperatures, showing initial degradation processes only at temperatures higher than 250°C. Differential scanning calorimetry analyses were carried out to study melting and crystallization phenomena, while mechanical properties were investigated by tensile tests. The materials finally showed properties similar to those of the matrix. The bio-composites can be considered as an alternative to plain PHBV, since they are less expensive and eco-friendlier thanks to a reduced polymeric content, and they could represent a suitable way for full agro-waste exploitation.
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Affiliation(s)
- Stefania Monari
- Department of Biological, Geological and Environmental Sciences, University of Bologna, Bologna, Italy
| | - Maura Ferri
- Department of Biological, Geological and Environmental Sciences, University of Bologna, Bologna, Italy
- Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Bologna, Italy
| | - Micaela Vannini
- Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Bologna, Italy
| | - Laura Sisti
- Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Bologna, Italy
| | - Paola Marchese
- Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Bologna, Italy
| | - Maria Ehrnell
- Department of Agriculture & Food, RISE – Research Institutes of Sweden, Gothenburg, Sweden
| | - Epameinondas Xanthakis
- Department of Agriculture & Food, RISE – Research Institutes of Sweden, Gothenburg, Sweden
| | - Annamaria Celli
- Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, Bologna, Italy
| | - Annalisa Tassoni
- Department of Biological, Geological and Environmental Sciences, University of Bologna, Bologna, Italy
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David G, Vannini M, Sisti L, Marchese P, Celli A, Gontard N, Angellier-Coussy H. Eco-Conversion of Two Winery Lignocellulosic Wastes into Fillers for Biocomposites: Vine Shoots and Wine Pomaces. Polymers (Basel) 2020; 12:E1530. [PMID: 32664324 PMCID: PMC7408111 DOI: 10.3390/polym12071530] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 07/04/2020] [Accepted: 07/06/2020] [Indexed: 11/16/2022] Open
Abstract
Two winery residues, namely vine shoots (ViSh) and wine pomace (WiPo), were up-cycled as fillers in PHBV-based biocomposites. Answering a biorefinery approach, the impact of a preliminary polyphenols extraction step using an acetone/water mixture on the reinforcing effect of fillers was assessed. Biocomposites (filler content up to 20 wt%) were prepared by melt-mixing and compared in terms of final performance (thermal, mechanical and barrier). It was shown that the reinforcing effect was slightly better in the case of vine shoots, while it was not significantly affected by the pre-treatment, demonstrating that these two winery residues could be perfectly used as fillers in composite materials even after an extraction process to maximize their potential of valorization.
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Affiliation(s)
- Grégoire David
- JRU IATE 1208–Univ Montpellier, INRAE, 2 Place Pierre Viala, Bat 31, F-34060 Montpellier 01, France; (G.D.); (N.G.)
| | - Micaela Vannini
- Department of Civil, Chemical, Environmental, and Materials Engineering, University of Bologna, Via Terracini 28, 40131 Bologna, Italy; (L.S.); (P.M.); (A.C.)
| | - Laura Sisti
- Department of Civil, Chemical, Environmental, and Materials Engineering, University of Bologna, Via Terracini 28, 40131 Bologna, Italy; (L.S.); (P.M.); (A.C.)
| | - Paola Marchese
- Department of Civil, Chemical, Environmental, and Materials Engineering, University of Bologna, Via Terracini 28, 40131 Bologna, Italy; (L.S.); (P.M.); (A.C.)
| | - Annamaria Celli
- Department of Civil, Chemical, Environmental, and Materials Engineering, University of Bologna, Via Terracini 28, 40131 Bologna, Italy; (L.S.); (P.M.); (A.C.)
| | - Nathalie Gontard
- JRU IATE 1208–Univ Montpellier, INRAE, 2 Place Pierre Viala, Bat 31, F-34060 Montpellier 01, France; (G.D.); (N.G.)
| | - Hélène Angellier-Coussy
- JRU IATE 1208–Univ Montpellier, INRAE, 2 Place Pierre Viala, Bat 31, F-34060 Montpellier 01, France; (G.D.); (N.G.)
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