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金花菌黄色素的稳定性及其抗氧化活性研究
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陕西省科技厅统筹项目(No. 2011KTCQ03-08)


Study on stability and antioxidant activity of the yellow pigments from Eurotium cristatum
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    摘要:

    【目的】评价茯砖茶金花菌黄色素的稳定性和抗氧化性能。【方法】以色素保存率为指标, 研究温度、光照和pH对黄色素稳定性的影响。并对还原能力、DPPH·清除能力和H2O2诱导的红细胞溶血抑制能力进行测定, 考察黄色素的抗氧化性能。【结果】该色素在低温下保存7 d保存率高于98.88%, 温度升高, 保存率降低; 光照尤其是太阳光对其稳定性影响较大; 黄色素在pH 2?10较稳定, pH 12时色素保存率仅为46.22%。低浓度黄色素具有明显高于维生素E (VE)的还原能力、DPPH·清除率和溶血抑制率, 其中DPPH·的EC50低于50 mg/L。【结论】金花菌黄色素对热、酸和弱碱较稳定, 对强碱和太阳光极不稳定, 并有优良的抗氧化能力, 研究和开发前景良好。

    Abstract:

    [Objective] Stability and antioxidant activity of the yellow pigments from Eurotium cristatum were evaluated. [Methods] Taking preservation rate of the pigments as an indicator, the effect of different temperature, light and pH on the stability were assessed. Antioxidant activity of the yellow pigments was investigated by three methods: reducibility, DPPH· scavenging activity and inhibition of erythrocyte hemolysis induced by H2O2. [Results] The results of stability test showed that preservation rate of the pigments was more than 98.88% after low-temperature treatment for 7 days and declined as the temperature increasing. Light, especially sunlight, resulted in an obvious loss of stability of the pigments. Better stability of the pigments was observed in the range of pH 2?10. However, preservation rate was lower than 46.22% at pH 12. At low concentration the pigments had higher reducibility, DPPH· scavenging activity and inhibition rate of erythrocyte hemolysis than VE, and the hemi-inhibitable concentration (EC50) to DPPH· was lower than 50 mg/L. [Conclusion] The yellow pigments from Eurotium cristatum had better stability in the condition of heat and acid but alkali and sunlight were not. What′s more, the pigments had higher antioxidant activity.

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李玉婷,吕嘉枥. 金花菌黄色素的稳定性及其抗氧化活性研究[J]. 微生物学通报, 2013, 40(11): 2030-2036

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  • 在线发布日期: 2013-11-04
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