... the properties that sucrose and other carbohydrates hold. Stevia extracts, like rebaudioside-A, are found to be 300 times ... than sugar. In contrast to sugar, however, stevia extracts have several unique properties such as long shelf life, ... , flavonoids, and tannins. Some of flavonoid polyphenolic anti-oxidant phyto-chemicals present in stevia are kaempferol, quercetin, chlorogenic acid, caffeic ...