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Removal of Tannins from Quercus mongolica Fisch Acorns

CAO Hai-xia,YANG Xiao-qing(College of Food Science and Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China)  
An ultrasonic-assisted solvent extraction method for the removal of tannins from acorns,Quercus mongolica Fisch,was explored in this work.Main process parameters influencing the removal efficiency of tannins were identified by one-factor-at-a-time method and optimized by orthogonal array design.Optimum removal conditions were obtained when using 40% ethanol as the extraction solvent at a solid-to-liquid ratio to extract acorn powder with particle size over 80 mesh at 55 ℃ for 60 min with an ultrasonic power of 400 W.The maximum removal efficiency of tannins observed under the optimum conditions was 69.99 mg/g.
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