NC State
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.


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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