摘要
采用醇提法提取红心火龙果果皮中的色素,研究温度、pH值、蔗糖、葡萄糖、抗氧化剂、稳定剂、防腐剂和金属离子等对其稳定性的影响.结果表明,在温度低于40℃时色素稳定性良好;在弱酸性条件下较为稳定;蔗糖、葡萄糖、羧甲基纤维素钠对其稳定性有促进作用;抗坏血酸对其稳定性影响较小;山梨酸钾对其有一定的破坏作用;K+,Zn2+,Mg2+和Na+4种金属离子对其稳定性无较大影响,Al3+浓度小于5 mmol/L时,对其稳定性影响较小,而Fe3+,Fe2+和Cu2+3种金属离子对其稳定性则有较大影响.因此,红心火龙果果皮色素加工应用过程要在低温、弱酸条件下进行,且不能添加山梨酸钾,避免接触铝离子、铁离子、亚铁离子、铜离子.
Abstract
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+.
万方数据