【摘要】 为了解洋紫苏红色素的理化性质和开发应用的可行性,用丙酮抽提和分离洋紫苏的红色素,对其理化性质进行研究。结果表明,洋紫苏色素最大吸收波长是400 nm,在红光区没有吸收峰。在pH 8.0时,该色素的颜色最深。45~65℃下色素稳定性较高,当处理温度为85℃时,短时间内(2 h)色素颜色加深,处理时间延长则导致色素降解。白光照射使色素溶液的颜色明显变深。防腐剂苯甲酸钠对该色素有保色和增色效应;而还原剂亚硫酸钠则有强烈的增色作用;H2O2使洋紫苏色素氧化而颜色变浅;葡萄糖对其基本没有影响。Mg2+和Na+对洋紫苏红色素有轻微的增色作用,低浓度Ca2+和K+有一定的增色作用而高浓度则表现出减色效应。更多还原

【Abstract】 In order to comprehend the physical and chemical properties and application feasibility of Coleus blumeipigment,the red pigment was extracted by using acetone as extracting solution,then the physical and chemical properties were studied. It was indicated that the maximal absorption wavelength of the pigment was 400 nm,There was no absorption peak in infrared region. The red color was the deepest at pH 8.0. The pigment was stable at 45℃ to 65℃. When the pigment was heated at 85℃,its color deepened in a short time(within 2 hours). The pigment was degraded when being treated at 85℃ for a long time. White light could make the pigment color darker obviously. The oxidant sodium benzoate could keep the color or had hyperchromic effect on the pigment. The reductant sodium sulfite had strong hyperchromic effect on the pigment. Hydrogen peroxide treatment had hypochromic effect on the pigment. Glucose had no effect on the color of the pigment. Mg+2 and Na+ had slight hyperchromic effect on the pigment. Ca+2 and K+ in low concentration had hyperchromic effect,but Ca+2 and K+ in high concentration had hypochromic effect.更多还原