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Influence of corn germ pretreatment methods on tocopherol contents in n-hexane system
  
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KeyWord:tocopherol  corn germ  high-temperature dry-heat treatment  wet-heat treatment with high pressure steam
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JI Congli，HUANG Jianhua，LIU Ruijie，et al  
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Abstract:
      The corn germ was pretreated by baking for 2 h at 105℃ or heating for 5 min with 110℃，005 MPa high pressure steam, and then it was adjusted to different water contents. Room-temperature and away-from-light storage experiment was conducted by putting corn germ pretreated into tocopherol n-hexane solution, then the change of tocopherol content was measured during the storage to systemically study the influence of different pretreatment methods of corn germ on tocopherol contents. The results showed that the higher the water content of the corn germ without pretreatment was, the faster the contents of gamma and alpha tocopherol in tocopherol n-hexane solution decreased; baking for 2 h at 105℃ and heating for 5 min with 110℃，0.05 MPa high pressure steam could both effectively keep the contents of gamma and alpha tocopherol constants. Therefore, the corn germ should be pretreated to prevent the oxidation of tocopherol before processing corn germ oil.
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