Ethanol extraction of polyphenols in an immersion extractor. Effect of pulsing flow

  title={Ethanol extraction of polyphenols in an immersion extractor. Effect of pulsing flow},
  author={Jorge Sineiro and Herminia Dom{\'i}nguez and Mar{\'i}a Jos{\'e} N{\'u}{\~n}ez and Juan Manuel Lema},
  journal={Journal of the American Oil Chemists’ Society},
A comparative study on polyphenol extraction from sunflower press cake in a semicontinuous pulsed-flow immersion extractor and in a conventional laboratory immersion extractor was developed. The solvent was 96% (vol/vol) ethanol. No difference in the residual polyphenol content in the cake was observed at short times, but after 10 h, the pulsed extractor showed a higher polyphenol concentration in the outlet miscella. In addition, the effective diffusivity of polyphenols in sunflower press cake… 
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