Abstract
Purple sweet potato pigment is a natural food pigment with bright color and multiplies biological functions such as antioxidant activity etc. There is a large amount of unused pigment in the vinasse of purple sweet potato wine. Therefore, in this study, the extraction processes of purple sweet potato pigment from purple sweet potato wine vinasse, as well as its purification conditions were investigated. As the results, 0.9% citric acid-95% ethanol (2/3, v/v) was a suitable extraction solvent to obtain the higher yield of purple sweet potato pigment from vinasse. AB-8 column chromatography showed that the loading ratio of 1/10 (w/v) of resin and pigment with the solvent of 40% ethanol at the flow rate of 2 mL/min were the optimal conditions for the purification of purple sweet potato pigment.
Highlights
IntroductionThe purple sweet potato pigment is in bright color, non-toxic and soluble in water which has the certain nutritional and pharmacological effects
The purple sweet potato contains rich anthocyanins pigment
The absorbance of AB-8 supernatant at 530 nm, which reflect the amount of purple sweet potato pigment, was significantly lower than that of D3520, indicated that the adsorption ability of AB-8 resin for purple sweet potato pigment was stronger than that of D3520
Summary
The purple sweet potato pigment is in bright color, non-toxic and soluble in water which has the certain nutritional and pharmacological effects. It plays an important role in antioxidant (Furuta et al, 1998), anti-inflammatory (Suda et al, 1997), antimutation (Yoshimoto et al, 2001), antitumor (Lim et al, 2013) and prevention and treatment of cardiovascular diseases (Park et al, 2010). To developing the extraction method of pigment from purple sweet potato lees well has positive significance in improving the deep processing and utilization efficiency of purple sweet potato
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