Study on Stability of Pigment from Red Pitaya Peel
In order to provide data reference for the processing and application of pigment from red pitaya peel,alcohol extrac-tion method was used to extract pigment from red pitaya peel,and the effects of temperature,pH,sucrose,glucose,reduc-tive agent,stabilizer,preservative and metal ions on the stability of pigment were studied.The result showed that the pigment had good stability under 40 ℃ and it was stable under weak acidic conditions;Sucrose,glucose and CMC can promote its stability;Ascorbic acid had little effect on its stability;potassium sorbate had some destructive effect on the pigment;4 kinds of metal ions(K+,Zn2+,Mg2+and Na+)had no significant effect on its stability,when the concentration of Al3+was less than 5 mmol/L,it had little effect on its stability;While Fe3+,Fe2+and Cu2+three metal ions had a significant effect on the stability of the pigment.Therefore,in the processing and application of the pigment from red pitaya peel,it should be carried out un-der lower temperature and weak acid conditions,and should be avoided adding potassium sorbate,contacting with Al3+,Fe3+,Fe2+and Cu2+.
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