Method for extract catechin

Catechin is a natural antioxidant, which usually exists in green tea. The following is the extraction method of catechin:

1. Crush green tea and extract catechin with ethanol. Soak green tea in ethanol for about 24 hours. Then the extract is filtered, distilled and dried to obtain catechin powder.

2. Use steam distillation. Put the green tea into a distiller and distill it with steam. Putting the collected extractive solution into a freezing centrifuge for centrifugation, and separating catechin.

3. Supercritical carbon dioxide extraction is adopted. Put the green tea into a supercritical carbon dioxide extractor and extract it with high pressure carbon dioxide. Decompression and heating are carried out on the extractive solution to make it into a gaseous state, and then the gaseous state is cooled and condensed into a liquid state to separate catechins.

Among these methods, steam distillation and supercritical carbon dioxide extraction are commonly used to extract catechins, because the content of catechins extracted by these two methods is high and the extraction process is environmentally friendly.