It is well known that tea has many beneficial effects to consumers' health, and the possible reason may be existence of many antioxidatives in tea, such as catechins (mainly flavanols) and flavonols. There are many reports about catechins in tea, but much less about flavonols. And teas from different geographic regions or of different classes could have much difference in flavonol contents. China, as a big tea exporter, produces varieties of teas in many regions. In this article, flavonol content in about 4...