The recovery of phenolic compounds from the two main components of artichoke waste, the outer bracts and the stems, was investigated. The total polyphenol content, expressed as gallic acid equivalents (GAE) per g of dry weight, was 24.14 ± 0.73 mg GAE/g for bracts and 35.71 ± 1.65 mg GAE/g for stems. Different solvents, including acetone, ethanol, hexane, ethyl lactate, water and 50:50 ethanol–water mixture, were preliminarily screened for their extraction efficiency. Aqueous ethanol was the most effective solvent and was used to assess the effects of temperature (T = 40–60 °C), extraction time (E = 30–90 min) and liquid-to-solid ratio (R = 10–30 mL g–1) on the extraction yields. Under the best conditions (T = 60 °C, E = 90 min, R = 30 mL g–1), the amount of phenolics recovered from bracts and stems were 19.44 and 28.02 mg GAE/g, respectively. For both materials, E was the most influential factor, followed by T and R. Overall, the results obtained support the use of artichoke waste as
The recovery of phenolic compounds from the two main components of artichoke waste, the outer bracts and the stems, was investigated. The total polyphenol content, expressed as gallic acid equivalents (GAE) per g of dry weight, was 24.14 ± 0.73 mg GAE/g for bracts and 35.71 ± 1.65 mg GAE/g for stems. Different solvents, including acetone, ethanol, hexane, ethyl lactate, water and 50:50 ethanol-water mixture, were preliminarily screened for their extraction efficiency. Aqueous ethanol was the most effective solvent and was used to assess the effects of temperature (T = 40-60 °C), extraction time (E = 30 - 90 min) and liquid-To-solid ratio (R = 10 -30 mL g-1) on the extraction yields. Under the best conditions (T = 60 °C, E = 90 min, R = 30 mL g-1), the amount of phenolics recovered from bracts and stems were 19.44 and 28.02 mg GAE/g, respectively. For both materials, E was the most influential factor, followed by T and R. Overall, the results obtained support the use of artichoke waste as a source of phenolic antioxidants and give useful directions on how to improve recovery by proper selection of extraction conditions.
Effect of solvent type and extraction conditions on the recovery of Phenolic compounds from artichoke waste / Zuorro, Antonio; Maffei, Gianluca; Lavecchia, Roberto. - In: CHEMICAL ENGINEERING TRANSACTIONS. - ISSN 2283-9216. - STAMPA. - 39:Special Issue(2014), pp. 463-468. (Intervento presentato al convegno 17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2014 tenutosi a Prague, Czech Republic nel 23 August 2014 through 27 August 2014) [10.3303/cet1439078].
Effect of solvent type and extraction conditions on the recovery of Phenolic compounds from artichoke waste
ZUORRO, ANTONIO;MAFFEI, GIANLUCA;LAVECCHIA, Roberto
2014
Abstract
The recovery of phenolic compounds from the two main components of artichoke waste, the outer bracts and the stems, was investigated. The total polyphenol content, expressed as gallic acid equivalents (GAE) per g of dry weight, was 24.14 ± 0.73 mg GAE/g for bracts and 35.71 ± 1.65 mg GAE/g for stems. Different solvents, including acetone, ethanol, hexane, ethyl lactate, water and 50:50 ethanol–water mixture, were preliminarily screened for their extraction efficiency. Aqueous ethanol was the most effective solvent and was used to assess the effects of temperature (T = 40–60 °C), extraction time (E = 30–90 min) and liquid-to-solid ratio (R = 10–30 mL g–1) on the extraction yields. Under the best conditions (T = 60 °C, E = 90 min, R = 30 mL g–1), the amount of phenolics recovered from bracts and stems were 19.44 and 28.02 mg GAE/g, respectively. For both materials, E was the most influential factor, followed by T and R. Overall, the results obtained support the use of artichoke waste asI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
