2005•Anhui nongye kexueRequires access
Microwave Extraction of the Red Pigment of Peanut-skin and its Property
Hongmei Zhang
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Abstract
Microwave extraction of red pigment from red peanut skin was studied. The results showed that the optimum condition was that extraction power was 240 W, solvent was 60% alcohol, extraction time was 90s, the weight of mixture was 20 times as large as the peanut skin, the number of extraction stage was 2 so that the extracted total yield can be up to 95.26%. It showed the maximum absorption beam of peanut-skin red was 215 nm and 280 nm and it could be stabilized between pH1～12; It had good light and heat stability. The pigment would not be harmfully affected by NaCl, Ca~ 2+,Mg~ 2+,Cu~ 2+ and Zn~ 2+,but was changed by Fe~ 3+.Na_2SO_3 had no effect on pigment color, but H_2O_2 led to colorless. Its color could be increased by adding sucrose.