Abstract:Black Peanut skin contains a class of rich pigment. This pigment with deep color has high Anthocyanins content and it is easy to be extracted. Anthocyanins are a kind of nonpoisonous and water-solution natural pigment. It has great prospects in foods, cosmetics and medicine, for its nutritional and the pharmacological functions. Used as raw material, black peanut skin is extracted by acid solution and its extraction technology is studied. The effect of different factors on extraction of pigment is investigated though single and multiple factor tests, which contain acid degree, ratio of material to liquid, extraction temperature and extraction time, the optimum condition is that ratio of material to liquid is 1:60, extraction temperature is 40℃ and extraction time is 2 hours. Under the optimum conditions, the extraction rate of anthocyanins is 6.013mg\/100g. Respectively, measuring temperature, pH, light, the oxidant, the reductant, impact on the stability of anthocyanins, the results shows that anthocyanins pigment has good heat resistance, is highly affected by the pH, maximum absorption peak in pH2.62 place, shorter time of ultraviolet and visible light irradiation, the absorbance values of the anthocyanins solution and the scattering light no difference, no significant difference between different concentrations of Vc, H2O2 and Na2SO3 has a great influence on the stability of anthocyanins. In the preservation and application of anthocyanins should avoid.
Key words Black peanut skin Pigment Extraction Stability