1. Efficient green extraction of polyphenols from post-harvested agro-industry vegetal sources in Piedmont.
- Author
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Alexandru, Lavinia, Binello, Arianna, Mantegna, Stefano, Boffa, Luisa, Chemat, Farid, and Cravotto, Giancarlo
- Subjects
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EXTRACTION (Chemistry) , *POLYPHENOLS , *ANTIOXIDANTS , *GRAPES , *HAZELNUTS - Abstract
A study of the polyphenols content and antioxidant capacity of grapevine waste and hazelnut skins (roasted material) from post-harvest products that originate from Piedmont (Italy) has been carried out and the results herein presented. Ultrasound-assisted extraction (UAE) and microwave-assisted extraction (MAE) were used to achieve process intensification in shorter extraction times, with lower environmental impact and higher selectivity compared to classic maceration. Besides classic solvents, the aqueous β-cyclodextrin solution (1.5%) showed to be an excellent extraction medium for grapevine waste. Total phenolic content (TP) from grapevine waste ranged from 18.23±2.4 to 198±3mg gallic acid equivalents (GAE)/g dry weight, while total antioxidant capacity (TAC) expressed as EC50 ranged from 0.0902±0.08mg/mL to 0.0041±0.02mg/mL. For hazelnut skins, TP ranged from 61.68±0.8 to 200.79±3.0mg GAE/g dry weight, while TAC ranged from 0.0021±0.0004 to 0.0002±0.0001mg/mL extract. We have shown that, compared to maceration, the use of UAE and MAE methods can enhance polyphenols recovery and antioxidant capacity. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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