Abstract: The effect of different extraction temperature (20~100℃) on the content of main chemical components, reversible and irreversible sediment amount of green tea infusion was investigated. The results showed that, with the increasing of extraction temperature, the solid concentration, content of main chemical components and the amount of reversible and irreversible tea sediment all significantly increased. When the extraction temperature was lower than 40℃, there was only a small amount of tea sediment and irreversible tea sediment formed. When the extraction temperature increased from 50℃ to 90℃, the solid concentration increased a little, but the more tea sediment amount increased. If the extraction temperature is lower than 50℃, the formation of tea sediment will be decreased greatly.

Key words: extraction temperature, irreversible sediment, reversible sediment, green tea infusion