Types of Green Tea Extracts
Strong infusions
- During the strong infusion green tea leaves are processed by soaking in the aqueous solution of alcohol (the aspect content is about 2% w/w).
Soft extracts
- To obtain soft extracts, the solution made by strong infusion beforehand is further concentrated to 20–25% (the catechin content is about 20% w/w).
Dry extracts
- After the strong infusions have been concentrated to 40–50% solids (the catechin content is above 25% w/w)，they are sprayed and then become dehydrated extract and powder. The leftovers - water content, which is less than 5% w/w, and the extract - are usually processed as a powder containing inert processing aids to become suitable for a variety of uses (tablets, capsules, dry mixes, etc.).
Partly purified extracts
- Further purification processes, for example, solvent extraction or column chromatography techniques, as well as new techniques such as membrane extraction and separation, are utilized in order to acquire a higher content of tea catechins.
, epigallocatechin (EGC), epicatechin gallate (ECG) and epicatechin (EC). Of which, EGCG accounts for more than 40% of the total content.
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