摘要:
火龙果色素是天然的植物源染色剂,成分稳定且色域范围广阔,开展火龙果色素提取工艺研究,实现火龙果的综合利用意义重大。采用经冷冻干燥机冻干制取的火龙果果肉粉末,通过单因素再通过多因素正交试验,进行色素浸提工艺的优化。结果表明,采用浓度为20%的乙醇作为提取剂,红色素溶液颜色最亮丽,此时吸光值最大;酸性条件下有利于果肉色素的提取;温度40℃时,吸光值最大。优化的最佳提取工艺为浸提温度30℃、浸提时间45min、pH为6.5和乙醇浓度30%。4个因素影响程度不同,其中浸提温度是浸提法提取火龙果果肉色素的关键控制因素。
Abstract:
The pigments of pitaya are natural dyes from plant with the characters of stable and wide in color gamut. The study was extracting red pigment from the pulp of pitaya to develop its comprehensive utilization.The pulp powder was prepared for extraction with freeze drying method and extracting procedure was optimized by single factor method,and then multi-factor orthogonal test.The results showed that,using 20% ethanol as extraction agent,the color in red solution was the brightest with the highest in absorbance.The acidity in the solution enhanced the pigment extraction;the maximum absorbance was observed while the temperature for extraction was at 40℃.The procedure of the optimum extraction was as extraction temperature 30℃,extraction time 45min,pH 6.5,and 30%ethanol concentration.The 4factors affected extraction differently,of which,extraction temperature was the key factor for controlling.
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