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High efficient adsorption of silica as a new environmentally friendly adsorbent in edible oil
  
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KeyWord:silica  edible oil  adsorption bleaching  environmentally friendly adsorbent
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WANG Sai Standard Investment (China)Co.,Ltd.，Shanghai 201103,China 
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Abstract:
      For the problem of light color of oil in conventional bleaching, silica was used for bleaching of sunflower seed oil in comparison with activated white clay, and the color,impurity content, oxidation induction period and risk substance content in sunflower seed oil bleached by different additions of silica were measured to examine the adsorption bleaching effect of silica. The results showed that the contents of phosphorus, benzo(a)pyrene and aflatoxin B1 of silica (dosage 0.1%-0.5%) bleached sunflower seed oil were comparable to those of 0.5% activated white clay bleached sunflower seed oil, but compared with 0.5% activated white clay, the bleaching of 0.1% silica could maintain the color of sunflower seed oil, the soap was undetectable, and the oxidation induction period was significantly prolonged, indicating that silica had a better adsorption bleaching effect in edible oil.
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