Article ID Journal Published Year Pages File Type
1269678 Ultrasonics Sonochemistry 2015 7 Pages PDF
Abstract

•Spruce bark (picea abies) is a rich source of phenolic compounds with antioxidant activity.•Non-toxic solvent was used (ethanol and water).•Effects of ultrasound-assisted extraction as influenced by time, temperature and ethanol concentration were evaluated.•Polyphenols extraction is improved by ultrasound assisted extraction with 70% ethanol.•The highest yield of total polyphenols obtained by ANOVA factorial was 13.232 mg GAE/g spruce wood bark.

Here we describe the ultrasound-assisted extraction of the phenolic compounds from spruce wood bark and present a straight-forward experimental planning method, allowing the optimisation of the process. The effect of ethanol concentration, temperature and extraction time were evaluated through a 32·2 experimental planning. The efficiency of the extraction process was appreciated based on factorial ANOVA results. The maximum extraction yield of total polyphenols (13.232 mg gallic acid equivalents (GAE)/g of spruce bark tested) was obtained using a process time of 60 min, an extraction temperature of 54 °C and a concentration of ethanol of 70% respectively. These results indicate that an important quantity of bioactive compounds can be extracted from spruce wood bark by ultrasound assisted extraction technology.

Related Topics
Physical Sciences and Engineering Chemistry Chemistry (General)
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