Study on Extraction of Pigment from Black Peanut Skin

[Objective] The study aimed to seek for the optimum technology conditions for extracting the pigment from the black peanut skin.[Method] With the black peanut skin as the raw material,the technology conditions for extracting the pigment from black peanut skin were studied by using the microwave-assisted water leaching method.The effects of 4 factors including the alcohol concn.,solid-liquid ratio,microwave temperature and microwave time on the extraction rate of the pigment from the black peanut skin were studied through the single test,on which,the alcohol concn.,solid-liquid ratio,microwave time and microwave power were selected as the effecting factors to conduct the orthogonal experiment so as to confirm the optimum technology conditions for extracting the pigment from black peanut skin.[Result] The orthogonal experiment shows that the effecting degree of various factors on the extraction of the pigment from black peanut skin was in order of microwave power solid-liquid ratio microwave time alcohol concn.,The optimum technology conditions for extracting the pigment from the black peanut skin as follows: 70% alcohol,solid-liquid ratio of 1∶ 50,microwave power of 350 W,microwave time of 3 min,and then extracting by water leaching under 65 ℃ for1h with the absorbance of 0.516 at 523 nm.[Conclusion] The study provided the theoretical reference for developing the new edible natural pigment with health care function.