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《Journal of the Chinese Cereals and Oils Association》 2008-06
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Change of Lipoxygenase and Yellow Pigments during Aging of Millets

Sun Haifeng1 Wang Lixia2 Wang Yuwen3 Li Wende1 (Chemistry and Chemical Engineering College of Shanxi University1,Taiyuan 030006) (Life Science and Technology College of Shanxi University2,Taiyuan 030006) (Millet Research Institute,Shanxi Academy of Agricultural Sciences3,Changzhi 046011)  
Aim To investigate the change of lipoxygenase(LOX) activity and yellow pigments(OD446) of millets in aging.Method millet samples of varieties "Changnong 0302" and "Fenzhouxiang" were placed at 35 ℃ to accelerate aging,and LOX activity and yellow pigments(OD446) were determined by ultravioletvisible spectrophotometry.Results LOX activities of the millet samples of both varieties decrease at 35 ℃,and reach rock bottom at the fourth week then increase gradually and reach top at the sixth and eighth week respectively,then decrease again,showing a trend of "down-up-down".The change of yellow pigments(OD446) for "Fenzhouxiang" is similar to the lipoxygenase activity,all OD446 drop first and show a "down-up-down" trend.The change of yellow pigments(OD446) for "changnong 0302" is steady in the first two weeks,increases subsequently then reaches rock bottom at the eighth week.Conclusion The LOX activity and yellow pigment content in millets are changed after being stored at 35 ℃,suggesting that high storage temperature have undesirable effects on millet quality.
【Fund】: 山西省自然科学基金资助项目(991099)
【CateGory Index】: TS212
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