The extraction conditions of red pigments under reduced pressure from jujube peel were investigated and further optimized. The effects of the solvent concentration,liquid/solid ratio,extraction time, and extraction temperature and extraction pressure on the pigments' yield were investigated by Single-Factor experiment. The results showed that the conditions for maximum pigment yields per gram jujube peel were : 40ml aqueous solvent with 1. 6% alkaline in 90℃ water bath for 50 minutes assisted by reduced pressure at 0. 005 Mpa. The comparison among reduced pressure, ordinary pressure and ultrasonic-assisted extraction showed that extraction under reduced pressure gained the highest color value of 21. 70.%对减压法提取陕西长枣枣皮红色素进行了研究,通过单因素实验考察了碱液浓度、液料比、真空度、提取温度和提取时间对提取得率的影响,结合正交实验结果得出:在碱液质量分数1.6％,液料比40 mL∶ 1g,90℃下,真空度0.05 MPa,提取时间50 min时,色素提取得率最大,可达8.226 mg/g.减压提取、常压提取和超声提取三种工艺的对比结果表明减压提取所得红枣色素的色价最高,可达21.70,是常压提取的2.78倍(21.27/7.657),超声的1.84倍(21.27/11.524).
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