Extractive technique and trait of re d pigment in amaranth
The ground amaranth was extracted wi th 65℃water (1∶7.5)for 10min ,then the extracting liqui d was passed through the column of CaCO 3 ,collecting the liquid contained th e red pigment ,added auxiliary mater ial after con-centration ,and dried at 40℃vacuum conditions.The red pigment o f amaranth revealed the maximum peak of absorp-tion at 460nm ,with good effect again st the sun light ,nature light of room;having the steady color at 4~121℃;and with the good steady color at pH 1~7,varying for color at pH 7~14;without v arying of pigment color at 0.17~0.85mol /L Na + concentration ,and Fe 2+ ,Cu 2+ and Ca 2+ resulted from varying of the pigment color at concentration of 65.79~328.9mmol /L ,62.7~314.9mmo l /L and 0.13~0.66mol /L,respective ly;H 2 O 2 (1%~10%),Na 2 SO 3 (1%~10%)and vitamin C (1%~10%)have no effect on colr of pigment.