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洋葱色素的提取及抗氧化活性的测定 总被引：6，自引：0，他引：6
分别用芬顿（Fenton）反应法和1，1-二苯-2-苦肼基（DPPH）法测定了洋葱色素的抗氧化作用。结果表明，洋葱色素对羟自由基和DPPH自由基均有一定的清除作用，其清除率大小依次为42．4％，58．2％。洋葱色素是十分具有开发利用价值的天然色素。 相似文献
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The colloids of Eu(DBM)3 and ultrafine particles Eu(DBM)3 were perpared. The particle sizes determined by X-ray and by TEM measurements were in 7-30nm range. Their UV absorption and fluorescence spectra were compared with each other and with those of the solid sample. It was shown that the 5D1→7 F1,2 transition was observed in the colloids of Eu(DBM)3 at room temperature. The increase of the excited-state S1 and T1 energy, the peak positions of UV absorption shifted to shorter wavelength, the changes of the absoprtion coefficient with decreasing size were observed. 相似文献
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