1. Rutin exists in the rue leaf, tobacco, orange peel, tomato, etc., acacia rice and buckwheat flower content is particularly rich. China's medicinal rutin is extracted from the acacia rice. Sophora rice after washing, with hot water and milk of lime (pH to 7.5

-8) boiled for 20min, add borax, at 95-100 ℃ half an hour of insulation, filtered while hot, with hydrochloric acid will be adjusted to pH 6-7 filtrate, cooled to 30 ℃ or less, static precipitation of crystals, separated from the crude rue glucoside, after dissolution, recrystallization, drying that is, the finished product. Total yield of 8.3% by acacia rice.

2. Will be raw materials (usually with acacia buds) crushed, extracted with hot ethanol, and then by ether, hot methanol and hot water for many times to crystallize and refined. The residue obtained after the concentration of extracts, with solvents to remove other soluble pigments and other impurities, and then by ethanol, ether, hot methanol and hot water for many times by crystallization and activated carbon refining and high purity.