红米红色素的稳定性研究

Study on stability of red rice red pigment

采用紫外-可见分光光度法研究了天然染料红米红色素对pH、温度、光照时间、羧酸改性、金属离子的稳定性名吉果表明：红米红色素在pH=2-4较稳定；温度、光照跗间、羧酸改性及碱性条件对稳定性影响较大；Mg^2＋、Al^3＋、Zn^2＋对红米红色素的光谱波形影响不大，Fe^3＋对波形有影响，色素颜色改变．

The stability of red rice red pigment under different conditions such as pH, temperature, expo- sure time, carboxylic acid-modification, metal ions was investigated by UV-Vis spectrophotometric method. The results showed that the red rice red pigment was stable when the pH was 2-4; temperature, exposure time, carboxylic acid-modification and alkaline condition had effect on its stability; Mg2＋, AI3＋ and Zn2＋ had little effect on the spectral waveform of red rice red pigment, and Fe3＋ affected both its waveform and color.