Study on Extraction and Stability of Red Pigment in Hylocereus Undatus Fruit
Pitaya,full of non-toxicity natural red pigment,is one of the most adorable fruit,which has beautiful bright color.This paper uses the red skin pitaya sold on the market as the ingredient for pigment solvent extraction,and the single factor experiment showed that the optimum conditions of extraction operation were 50％ethanol as extraction agent,solid-liquid ratio 1∶20(g∶mL),extraction time 50 min,extraction temperature 30 ℃.After analysis of the triple-factors and triple-levels of by response surface methodology,it presents the conditions of the optimal extraction were solid-liquid ratio 1∶20.29(g∶mL),extraction time 69.31 min,extraction temperature 29.61 ℃.After temperature,light and pH test,qualitative analysis on the stability of the red pigment,it is concluded that the room temperature is more suitable for the red pigment;solar light will reduce the red pigment stability;the stability of the red pigment is better under the acidic environment than the alkaline environment.
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