Publicação
Sustainable Recovery of Some Phenolic Compounds from Portuguese Varieties of Grapevine Canes
| Resumo: | In the context of a "zero-waste economy", the valorization of agricultural by-products has gained importance, particularly grapevine canes (Vitis vinifera L.), the primary waste product of viticulture. These canes are rich in lignin, cellulose, and phenolic compounds, which exhibit antioxidant properties valuable to industries like cosmetics. This research investigates the extraction of phenolic compounds from six Portuguese grapevine varieties, focusing on the influence of grape species, extraction methods, and processing conditions on the extract composition. Three extraction methods were explored: Maceration extraction, which served as a starting point to assess the potential of grapevine canes; Soxhlet extraction, which yielded extracts rich in Total Phenolic Content (TPC) and demonstrated high Antioxidant Activity (AA), serving as a benchmark; and Supercritical CO₂ (scCO₂) extraction which produced phenolic-rich extracts with synergistic antioxidant effects, making them suitable for cosmetics without further fractionation. A total of 33 compounds were identified, comprising 14 Flavonoids, 11 Stilbenes, 3 Phenolic Acids, 1 Tannin, and 4 non-phenolic compounds: Quinic acid, Tartaric acid, Caftaric acid and its isomer. The economic analysis confirmed the feasibility of scaling up the scCO₂ process, showing promising results, suggesting that repurposing grapevine canes as a source of bioactive compounds holds significant promise for industrial applications. |
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| Autores principais: | Duarte, Luís Chalita Lousa |
| Assunto: | Grapevine canes Phenolic compounds Total Phenolic Content Antioxidant Activity Cosmetics |
| Ano: | 2024 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade Nova de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório Institucional da UNL |
| Resumo: | In the context of a "zero-waste economy", the valorization of agricultural by-products has gained importance, particularly grapevine canes (Vitis vinifera L.), the primary waste product of viticulture. These canes are rich in lignin, cellulose, and phenolic compounds, which exhibit antioxidant properties valuable to industries like cosmetics. This research investigates the extraction of phenolic compounds from six Portuguese grapevine varieties, focusing on the influence of grape species, extraction methods, and processing conditions on the extract composition. Three extraction methods were explored: Maceration extraction, which served as a starting point to assess the potential of grapevine canes; Soxhlet extraction, which yielded extracts rich in Total Phenolic Content (TPC) and demonstrated high Antioxidant Activity (AA), serving as a benchmark; and Supercritical CO₂ (scCO₂) extraction which produced phenolic-rich extracts with synergistic antioxidant effects, making them suitable for cosmetics without further fractionation. A total of 33 compounds were identified, comprising 14 Flavonoids, 11 Stilbenes, 3 Phenolic Acids, 1 Tannin, and 4 non-phenolic compounds: Quinic acid, Tartaric acid, Caftaric acid and its isomer. The economic analysis confirmed the feasibility of scaling up the scCO₂ process, showing promising results, suggesting that repurposing grapevine canes as a source of bioactive compounds holds significant promise for industrial applications. |
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