黑米中微量营养元素Fe、Zn、Cu和黑米色素的研究

Study on the Micronutrients Fe,Zn,Cu and Pigment in Black Rice

研究黑米中微量元素Fe、Zn、Cu的含量与分布,及光、温度和几种常见金属离子对黑米色素稳定性的影响。原子吸收光谱测定表明,黑米中Fe和Zn的含量分别为38610^(－5)和36010^(－6);主要富集于黑米色素中。Cu的含量均低于1010^(－6)。黑米色素水溶液(pH=3)于温度70~100℃中,随着温度升高和延长加热时间,吸光值明显降低。光照对色素稳定性的影响随时间延长而增大。Fe^(2+)、Fe^(3+)和Sn^(2+)明显的影响色素的稳定性,而Ca^(2+)、Na^+、Cu^(2+)、Zn^(2+)的作用较小,Al^(3+)和Mg^(2+)可提高黑米色素的稳定性。

The content and distribution of microelements, Fe、 Zn、 Cu in black rice and the effect of light. Temperature and some common metal ions on the stability of black rice pigment were declared, Determination indicated that the content of Fe and Zn in black rice were 386 10-6 and 360 10-6 respectively and concentrated in the pigment, while the content of Cu was Less than 10 10-6. The influence of light against stability of the pigment increased in accordance with The duration of exposed time. Fe2+、 Fe3+、 and Sn2+ strongly influence the pigment stability.