以含硫化合物还原红曲色素,红斑素和红曲红素分子中的环羰基还原成羟基,得到水溶性红白曲黄色素.以 UV-Vis、IR和(?)H-~(13)CNMR对其结构进行了表征.该色素的吸光度随pH增大而略呈上升趋势,避光可明显提高其稳定性.除Mg~(2+)在pH9下使其溶液产生沉淀外,Sn~(2+)、Ca~(2+)、Fe~(3+)和AI~(3+)均不影响其稳定性.不同pH和温度下加热实验结果表明,酸性条件对其热稳定性影响较大. The reduction of the carbonyl groups in the monascorubrin, erythromycin and monascorubrin molecules to hydroxyl groups by the sulfur compounds resulted in the formation of water-soluble erythorbine yellow pigment.The UV-Vis, IR and (?) H- ~ (13) CNMR showed that the absorbance of the dye increased slightly with the increase of pH, and the stability of the dye was improved by the light irradiation. Except for the Mg2 + solution which precipitated at pH9, (2 +), Ca ~ (2 +), Fe ~ (3+) and AI ~ (3+) did not affect the stability.The results of heating at different pH and temperature showed that the influence of acidic conditions on the thermal stability Larger.