cold soak method

warm soak method

A method in which medicinal materials are soaked in an appropriate solvent for a certain period of time under normal temperature or warm conditions to extract the active ingredients.

Convenient and simple to operate, long extraction time, low efficiency, water extraction is prone to mildew

A dynamic extraction method that puts the coarse powder of medicinal materials in a percolation device, continuously adds solvent to penetrate the medicinal powder, flows from top to bottom, and leaches out the active ingredients.

Water, ethanol, acid or alkali

Add water to the medicinal materials, heat and boil, filter to remove residue and take the decoction liquid

Natural medicines whose active ingredients are soluble in water and not easily destroyed by water or heat are not suitable for extracting natural medicines that contain volatile oil components and are easily destroyed by heat. Medicinal materials rich in polysaccharides

Simple operation and more efficient than cold soaking method

Extraction of highly fat-soluble natural medicinal chemical components, such as terpenes, steroids, anthraquinones, etc.; if solvents such as methanol or aqueous ethanol are used, water-soluble compounds can also be extracted with fewer impurities

The extraction efficiency is high, the solvent consumption is large, and the operation is troublesome.