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The crude pulverized konjac flour(PK) generally presented its characteristic unpleasant smell and irritant taste which can be partly removed with stepwise ethanol washing.However,the traditional refining process cost a long time and may be simplified and quickened in combination with bleaching.A bleached pulverized konjac flour was prepared by introducing a bleaching step with tow concentration of H2O2-citric acid-aqueous ethanol solution at slightly acid condition