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Sládková, A., Benedekov, M., Stopka, J., Šurina, I., Ház, A., Strižincová, P., Čižová, K., Škulcová, A., Burčová, Z., Kreps, F., Šima, J., and Jablonský, M. (2016). "Yield of polyphenolic substances extracted from spruce (Picea abies) bark by microwave-assisted extraction," BioRes. 11(4), 9912-9921.

Abstract

Closed-system microwave-assisted extraction was applied to extract total phenolics from spruce (Picea abies) bark, using 96.6% ethanol as an extractant. The influence of particle size (0.3; 1.0; 2.5 mm), time (3 to 20 min), and temperature (60; 80; 100 °C) on polyphenol recovery was also studied. Higher extraction temperature and smaller particle size resulted in a higher yield of extracted polyphenols. However, the effect of extraction time on yield was more complicated. The effect of all three factors is tentatively explained.


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