In this experiment, the norbixin was extracted and prepared by means of aqueous alkali and acid precipitation, adverse concentration gradient and membrane filtration technology.

• 本实验通过碱溶酸沉、逆浓度梯度和膜分离技术的提取方法来制备降胭脂树橙,其工艺条件为:料:液=1:9(w/w);